diff --git a/actions/accesstoken.php b/actions/accesstoken.php
index 072ce27eb5..ad03b70190 100644
--- a/actions/accesstoken.php
+++ b/actions/accesstoken.php
@@ -38,7 +38,7 @@ class AccesstokenAction extends Action
             common_debug('printing the access token', __FILE__);
             print $token;
         } catch (OAuthException $e) {
-            common_server_error($e->getMessage());
+            $this->serverError($e->getMessage());
         }
     }
 }
diff --git a/actions/all.php b/actions/all.php
index a8a74fb337..4ad7f12aee 100644
--- a/actions/all.php
+++ b/actions/all.php
@@ -33,14 +33,14 @@ class AllAction extends StreamAction
         $user = User::staticGet('nickname', $nickname);
 
         if (!$user) {
-            $this->client_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
             return;
         }
 
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'));
+            $this->serverError(_('User has no profile.'));
             return;
         }
 
diff --git a/actions/allrss.php b/actions/allrss.php
index 660afb9e2d..56818d605c 100644
--- a/actions/allrss.php
+++ b/actions/allrss.php
@@ -34,7 +34,7 @@ class AllrssAction extends Rss10Action
         $this->user = User::staticGet('nickname', $nickname);
 
         if (!$this->user) {
-            common_user_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
             return false;
         } else {
             return true;
diff --git a/actions/api.php b/actions/api.php
index 9cbf9a4681..64971774de 100644
--- a/actions/api.php
+++ b/actions/api.php
@@ -103,10 +103,10 @@ class ApiAction extends Action
 
                 call_user_func(array($action_obj, $this->api_method), $_REQUEST, $apidata);
             } else {
-                common_user_error("API method not found!", $code=404);
+                $this->clientError("API method not found!", $code=404);
             }
         } else {
-            common_user_error("API method not found!", $code=404);
+            $this->clientError("API method not found!", $code=404);
         }
     }
 
diff --git a/actions/avatarbynickname.php b/actions/avatarbynickname.php
index 666f386f66..d2d078b61f 100644
--- a/actions/avatarbynickname.php
+++ b/actions/avatarbynickname.php
@@ -26,28 +26,28 @@ class AvatarbynicknameAction extends Action
         parent::handle($args);
         $nickname = $this->trimmed('nickname');
         if (!$nickname) {
-            $this->client_error(_('No nickname.'));
+            $this->clientError(_('No nickname.'));
             return;
         }
         $size = $this->trimmed('size');
         if (!$size) {
-            $this->client_error(_('No size.'));
+            $this->clientError(_('No size.'));
             return;
         }
         $size = strtolower($size);
         if (!in_array($size, array('original', '96', '48', '24'))) {
-            $this->client_error(_('Invalid size.'));
+            $this->clientError(_('Invalid size.'));
             return;
         }
 
         $user = User::staticGet('nickname', $nickname);
         if (!$user) {
-            $this->client_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
             return;
         }
         $profile = $user->getProfile();
         if (!$profile) {
-            $this->client_error(_('User has no profile.'));
+            $this->clientError(_('User has no profile.'));
             return;
         }
         if ($size == 'original') {
diff --git a/actions/block.php b/actions/block.php
index f8f6f24fdb..738cbfbf71 100644
--- a/actions/block.php
+++ b/actions/block.php
@@ -30,28 +30,28 @@ class BlockAction extends Action
         parent::prepare($args);
 
         if (!common_logged_in()) {
-            $this->client_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
             return false;
         }
 
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_('There was a problem with your session token. Try again, please.'));
+            $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
 
         $id = $this->trimmed('blockto');
 
         if (!$id) {
-            $this->client_error(_('No profile specified.'));
+            $this->clientError(_('No profile specified.'));
             return false;
         }
 
         $this->profile = Profile::staticGet('id', $id);
 
         if (!$this->profile) {
-            $this->client_error(_('No profile with that ID.'));
+            $this->clientError(_('No profile with that ID.'));
             return false;
         }
 
@@ -119,14 +119,14 @@ class BlockAction extends Action
         $cur = common_current_user();
 
         if ($cur->hasBlocked($this->profile)) {
-            $this->client_error(_('You have already blocked this user.'));
+            $this->clientError(_('You have already blocked this user.'));
             return;
         }
 
         $result = $cur->block($this->profile);
 
         if (!$result) {
-            $this->server_error(_('Failed to save block information.'));
+            $this->serverError(_('Failed to save block information.'));
             return;
         }
 
diff --git a/actions/confirmaddress.php b/actions/confirmaddress.php
index 31a1577684..53410fbe63 100644
--- a/actions/confirmaddress.php
+++ b/actions/confirmaddress.php
@@ -32,26 +32,26 @@ class ConfirmaddressAction extends Action
         }
         $code = $this->trimmed('code');
         if (!$code) {
-            $this->client_error(_('No confirmation code.'));
+            $this->clientError(_('No confirmation code.'));
             return;
         }
         $confirm = Confirm_address::staticGet('code', $code);
         if (!$confirm) {
-            $this->client_error(_('Confirmation code not found.'));
+            $this->clientError(_('Confirmation code not found.'));
             return;
         }
         $cur = common_current_user();
         if ($cur->id != $confirm->user_id) {
-            $this->client_error(_('That confirmation code is not for you!'));
+            $this->clientError(_('That confirmation code is not for you!'));
             return;
         }
         $type = $confirm->address_type;
         if (!in_array($type, array('email', 'jabber', 'sms'))) {
-            $this->server_error(sprintf(_('Unrecognized address type %s'), $type));
+            $this->serverError(sprintf(_('Unrecognized address type %s'), $type));
             return;
         }
         if ($cur->$type == $confirm->address) {
-            $this->client_error(_('That address has already been confirmed.'));
+            $this->clientError(_('That address has already been confirmed.'));
             return;
         }
 
@@ -71,7 +71,7 @@ class ConfirmaddressAction extends Action
 
         if (!$result) {
             common_log_db_error($cur, 'UPDATE', __FILE__);
-            $this->server_error(_('Couldn\'t update user.'));
+            $this->serverError(_('Couldn\'t update user.'));
             return;
         }
 
@@ -83,7 +83,7 @@ class ConfirmaddressAction extends Action
 
         if (!$result) {
             common_log_db_error($confirm, 'DELETE', __FILE__);
-            $this->server_error(_('Couldn\'t delete email confirmation.'));
+            $this->serverError(_('Couldn\'t delete email confirmation.'));
             return;
         }
 
diff --git a/actions/deleteprofile.php b/actions/deleteprofile.php
index ef4687d5fa..cc236f8474 100644
--- a/actions/deleteprofile.php
+++ b/actions/deleteprofile.php
@@ -24,7 +24,7 @@ class DeleteprofileAction extends Action
     function handle($args)
     {
         parent::handle($args);
-        $this->server_error(_('Code not yet ready.'));
+        $this->serverError(_('Code not yet ready.'));
         return;
         if ('POST' === $_SERVER['REQUEST_METHOD']) {
             $this->handle_post();
diff --git a/actions/disfavor.php b/actions/disfavor.php
index 9a27f34b16..fc36f7c75f 100644
--- a/actions/disfavor.php
+++ b/actions/disfavor.php
@@ -28,7 +28,7 @@ class DisfavorAction extends Action
         parent::handle($args);
 
         if (!common_logged_in()) {
-            common_user_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
             return;
         }
 
@@ -46,7 +46,7 @@ class DisfavorAction extends Action
         $token = $this->trimmed('token-'.$notice->id);
 
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_("There was a problem with your session token. Try again, please."));
+            $this->clientError(_("There was a problem with your session token. Try again, please."));
             return;
         }
 
@@ -54,7 +54,7 @@ class DisfavorAction extends Action
         $fave->user_id = $this->id;
         $fave->notice_id = $notice->id;
         if (!$fave->find(true)) {
-            $this->client_error(_('This notice is not a favorite!'));
+            $this->clientError(_('This notice is not a favorite!'));
             return;
         }
 
@@ -62,7 +62,7 @@ class DisfavorAction extends Action
 
         if (!$result) {
             common_log_db_error($fave, 'DELETE', __FILE__);
-            $this->server_error(_('Could not delete favorite.'));
+            $this->serverError(_('Could not delete favorite.'));
             return;
         }
         
diff --git a/actions/doc.php b/actions/doc.php
index 98da312672..3d14b25b8a 100644
--- a/actions/doc.php
+++ b/actions/doc.php
@@ -28,7 +28,7 @@ class DocAction extends Action
         $title = $this->trimmed('title');
         $filename = INSTALLDIR.'/doc/'.$title;
         if (!file_exists($filename)) {
-            common_user_error(_('No such document.'));
+            $this->clientError(_('No such document.'));
             return;
         }
         $c = file_get_contents($filename);
diff --git a/actions/emailsettings.php b/actions/emailsettings.php
index 39f186bff0..6210c07b42 100644
--- a/actions/emailsettings.php
+++ b/actions/emailsettings.php
@@ -182,7 +182,7 @@ class EmailsettingsAction extends SettingsAction
 
         if ($result === false) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t update user.'));
+            $this->serverError(_('Couldn\'t update user.'));
             return;
         }
 
@@ -232,7 +232,7 @@ class EmailsettingsAction extends SettingsAction
 
         if ($result === false) {
             common_log_db_error($confirm, 'INSERT', __FILE__);
-            common_server_error(_('Couldn\'t insert confirmation code.'));
+            $this->serverError(_('Couldn\'t insert confirmation code.'));
             return;
         }
 
@@ -260,7 +260,7 @@ class EmailsettingsAction extends SettingsAction
 
         if (!$result) {
             common_log_db_error($confirm, 'DELETE', __FILE__);
-            $this->server_error(_('Couldn\'t delete email confirmation.'));
+            $this->serverError(_('Couldn\'t delete email confirmation.'));
             return;
         }
 
@@ -286,7 +286,7 @@ class EmailsettingsAction extends SettingsAction
         $result = $user->updateKeys($original);
         if (!$result) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t update user.'));
+            $this->serverError(_('Couldn\'t update user.'));
             return;
         }
         $user->query('COMMIT');
@@ -308,7 +308,7 @@ class EmailsettingsAction extends SettingsAction
 
         if (!$user->updateKeys($orig)) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            $this->server_error(_("Couldn't update user record."));
+            $this->serverError(_("Couldn't update user record."));
         }
         
         $this->show_form(_('Incoming email address removed.'), true);
@@ -323,7 +323,7 @@ class EmailsettingsAction extends SettingsAction
         
         if (!$user->updateKeys($orig)) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            $this->server_error(_("Couldn't update user record."));
+            $this->serverError(_("Couldn't update user record."));
         }
 
         $this->show_form(_('New incoming email address added.'), true);
diff --git a/actions/facebookremove.php b/actions/facebookremove.php
index a200fefbfe..d0a0dd9519 100644
--- a/actions/facebookremove.php
+++ b/actions/facebookremove.php
@@ -53,7 +53,7 @@ class FacebookremoveAction extends FacebookAction
 
             if (!$result) {
                 common_log_db_error($flink, 'DELETE', __FILE__);
-                common_server_error(_('Couldn\'t remove Facebook user.'));
+                $this->serverError(_('Couldn\'t remove Facebook user.'));
                 return;
             }
 
diff --git a/actions/favor.php b/actions/favor.php
index 1dfef9bbb3..8d751a7a97 100644
--- a/actions/favor.php
+++ b/actions/favor.php
@@ -29,7 +29,7 @@ class FavorAction extends Action
         parent::handle($args);
 
         if (!common_logged_in()) {
-            common_user_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
             return;
         }
 
@@ -48,19 +48,19 @@ class FavorAction extends Action
 
         $token = $this->trimmed('token-'.$notice->id);
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_("There was a problem with your session token. Try again, please."));
+            $this->clientError(_("There was a problem with your session token. Try again, please."));
             return;
         }
 
         if ($user->hasFave($notice)) {
-            $this->client_error(_('This notice is already a favorite!'));
+            $this->clientError(_('This notice is already a favorite!'));
             return;
         }
 
         $fave = Fave::addNew($user, $notice);
 
         if (!$fave) {
-            $this->server_error(_('Could not create favorite.'));
+            $this->serverError(_('Could not create favorite.'));
             return;
         }
 
diff --git a/actions/favoritesrss.php b/actions/favoritesrss.php
index 8c7ce52bf1..3f4ffc63a0 100644
--- a/actions/favoritesrss.php
+++ b/actions/favoritesrss.php
@@ -34,7 +34,7 @@ class FavoritesrssAction extends Rss10Action
         $this->user = User::staticGet('nickname', $nickname);
 
         if (!$this->user) {
-            common_user_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
             return false;
         } else {
             return true;
diff --git a/actions/finishaddopenid.php b/actions/finishaddopenid.php
index 7de631712a..708e8d4bfb 100644
--- a/actions/finishaddopenid.php
+++ b/actions/finishaddopenid.php
@@ -28,7 +28,7 @@ class FinishaddopenidAction extends Action
     {
         parent::handle($args);
         if (!common_logged_in()) {
-            common_user_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
         } else {
             $this->try_login();
         }
diff --git a/actions/finishopenidlogin.php b/actions/finishopenidlogin.php
index 112429002c..bc33ac330b 100644
--- a/actions/finishopenidlogin.php
+++ b/actions/finishopenidlogin.php
@@ -28,7 +28,7 @@ class FinishopenidloginAction extends Action
     {
         parent::handle($args);
         if (common_logged_in()) {
-            common_user_error(_('Already logged in.'));
+            $this->clientError(_('Already logged in.'));
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
@@ -179,7 +179,7 @@ class FinishopenidloginAction extends Action
         # FIXME: save invite code before redirect, and check here
 
         if (common_config('site', 'closed') || common_config('site', 'inviteonly')) {
-            common_user_error(_('Registration not allowed.'));
+            $this->clientError(_('Registration not allowed.'));
             return;
         }
 
@@ -205,7 +205,7 @@ class FinishopenidloginAction extends Action
         list($display, $canonical, $sreg) = $this->get_saved_values();
 
         if (!$display || !$canonical) {
-            common_server_error(_('Stored OpenID not found.'));
+            $this->serverError(_('Stored OpenID not found.'));
             return;
         }
 
@@ -214,7 +214,7 @@ class FinishopenidloginAction extends Action
         $other = oid_get_user($canonical);
 
         if ($other) {
-            common_server_error(_('Creating new account for OpenID that already has a user.'));
+            $this->serverError(_('Creating new account for OpenID that already has a user.'));
             return;
         }
 
@@ -274,14 +274,14 @@ class FinishopenidloginAction extends Action
         list($display, $canonical, $sreg) = $this->get_saved_values();
 
         if (!$display || !$canonical) {
-            common_server_error(_('Stored OpenID not found.'));
+            $this->serverError(_('Stored OpenID not found.'));
             return;
         }
 
         $result = oid_link_user($user->id, $canonical, $display);
 
         if (!$result) {
-            common_server_error(_('Error connecting user to OpenID.'));
+            $this->serverError(_('Error connecting user to OpenID.'));
             return;
         }
 
diff --git a/actions/finishremotesubscribe.php b/actions/finishremotesubscribe.php
index cee3a18187..f9094a50ca 100644
--- a/actions/finishremotesubscribe.php
+++ b/actions/finishremotesubscribe.php
@@ -30,14 +30,14 @@ class FinishremotesubscribeAction extends Action
         parent::handle($args);
 
         if (common_logged_in()) {
-            common_user_error(_('You can use the local subscription!'));
+            $this->clientError(_('You can use the local subscription!'));
             return;
         }
 
         $omb = $_SESSION['oauth_authorization_request'];
 
         if (!$omb) {
-            common_user_error(_('Not expecting this response!'));
+            $this->clientError(_('Not expecting this response!'));
             return;
         }
 
@@ -51,38 +51,38 @@ class FinishremotesubscribeAction extends Action
         # I think this is the success metric
 
         if ($token != $omb['token']) {
-            common_user_error(_('Not authorized.'));
+            $this->clientError(_('Not authorized.'));
             return;
         }
 
         $version = $req->get_parameter('omb_version');
 
         if ($version != OMB_VERSION_01) {
-            common_user_error(_('Unknown version of OMB protocol.'));
+            $this->clientError(_('Unknown version of OMB protocol.'));
             return;
         }
 
         $nickname = $req->get_parameter('omb_listener_nickname');
 
         if (!$nickname) {
-            common_user_error(_('No nickname provided by remote server.'));
+            $this->clientError(_('No nickname provided by remote server.'));
             return;
         }
 
         $profile_url = $req->get_parameter('omb_listener_profile');
 
         if (!$profile_url) {
-            common_user_error(_('No profile URL returned by server.'));
+            $this->clientError(_('No profile URL returned by server.'));
             return;
         }
 
         if (!Validate::uri($profile_url, array('allowed_schemes' => array('http', 'https')))) {
-            common_user_error(_('Invalid profile URL returned by server.'));
+            $this->clientError(_('Invalid profile URL returned by server.'));
             return;
         }
 
         if ($profile_url == common_local_url('showstream', array('nickname' => $nickname))) {
-            common_user_error(_('You can use the local subscription!'));
+            $this->clientError(_('You can use the local subscription!'));
             return;
         }
 
@@ -91,14 +91,14 @@ class FinishremotesubscribeAction extends Action
         $user = User::staticGet('nickname', $omb['listenee']);
 
         if (!$user) {
-            common_user_error(_('User being listened to doesn\'t exist.'));
+            $this->clientError(_('User being listened to doesn\'t exist.'));
             return;
         }
 
         $other = User::staticGet('uri', $omb['listener']);
 
         if ($other) {
-            common_user_error(_('You can use the local subscription!'));
+            $this->clientError(_('You can use the local subscription!'));
             return;
         }
 
@@ -111,7 +111,7 @@ class FinishremotesubscribeAction extends Action
         list($newtok, $newsecret) = $this->access_token($omb);
 
         if (!$newtok || !$newsecret) {
-            common_user_error(_('Couldn\'t convert request tokens to access tokens.'));
+            $this->clientError(_('Couldn\'t convert request tokens to access tokens.'));
             return;
         }
 
@@ -155,7 +155,7 @@ class FinishremotesubscribeAction extends Action
             $profile->created = DB_DataObject_Cast::dateTime(); # current time
             $id = $profile->insert();
             if (!$id) {
-                common_server_error(_('Error inserting new profile'));
+                $this->serverError(_('Error inserting new profile'));
                 return;
             }
             $remote->id = $id;
@@ -163,7 +163,7 @@ class FinishremotesubscribeAction extends Action
 
         if ($avatar_url) {
             if (!$this->add_avatar($profile, $avatar_url)) {
-                common_server_error(_('Error inserting avatar'));
+                $this->serverError(_('Error inserting avatar'));
                 return;
             }
         }
@@ -173,19 +173,19 @@ class FinishremotesubscribeAction extends Action
 
         if ($exists) {
             if (!$remote->update($orig_remote)) {
-                common_server_error(_('Error updating remote profile'));
+                $this->serverError(_('Error updating remote profile'));
                 return;
             }
         } else {
             $remote->created = DB_DataObject_Cast::dateTime(); # current time
             if (!$remote->insert()) {
-                common_server_error(_('Error inserting remote profile'));
+                $this->serverError(_('Error inserting remote profile'));
                 return;
             }
         }
 
         if ($user->hasBlocked($profile)) {
-            $this->client_error(_('That user has blocked you from subscribing.'));
+            $this->clientError(_('That user has blocked you from subscribing.'));
             return;
         }
 
@@ -215,7 +215,7 @@ class FinishremotesubscribeAction extends Action
 
         if (!$result) {
             common_log_db_error($sub, ($sub_exists) ? 'UPDATE' : 'INSERT', __FILE__);
-            common_user_error(_('Couldn\'t insert new subscription.'));
+            $this->clientError(_('Couldn\'t insert new subscription.'));
             return;
         }
 
diff --git a/actions/foaf.php b/actions/foaf.php
index 6f73ce505e..a0f8a1ff39 100644
--- a/actions/foaf.php
+++ b/actions/foaf.php
@@ -40,14 +40,14 @@ class FoafAction extends Action
         $user = User::staticGet('nickname', $nickname);
 
         if (!$user) {
-            common_user_error(_('No such user.'), 404);
+            $this->clientError(_('No such user.'), 404);
             return;
         }
 
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'), 500);
+            $this->serverError(_('User has no profile.'), 500);
             return;
         }
 
diff --git a/actions/imsettings.php b/actions/imsettings.php
index 693f49efa2..14df3451a8 100644
--- a/actions/imsettings.php
+++ b/actions/imsettings.php
@@ -149,7 +149,7 @@ class ImsettingsAction extends SettingsAction
 
         if ($result === false) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t update user.'));
+            $this->serverError(_('Couldn\'t update user.'));
             return;
         }
 
@@ -199,7 +199,7 @@ class ImsettingsAction extends SettingsAction
 
         if ($result === false) {
             common_log_db_error($confirm, 'INSERT', __FILE__);
-            common_server_error(_('Couldn\'t insert confirmation code.'));
+            $this->serverError(_('Couldn\'t insert confirmation code.'));
             return;
         }
 
@@ -231,7 +231,7 @@ class ImsettingsAction extends SettingsAction
 
         if (!$result) {
             common_log_db_error($confirm, 'DELETE', __FILE__);
-            $this->server_error(_('Couldn\'t delete email confirmation.'));
+            $this->serverError(_('Couldn\'t delete email confirmation.'));
             return;
         }
 
@@ -257,7 +257,7 @@ class ImsettingsAction extends SettingsAction
         $result = $user->updateKeys($original);
         if (!$result) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t update user.'));
+            $this->serverError(_('Couldn\'t update user.'));
             return;
         }
         $user->query('COMMIT');
diff --git a/actions/invite.php b/actions/invite.php
index 15233602e2..879264deb9 100644
--- a/actions/invite.php
+++ b/actions/invite.php
@@ -31,7 +31,7 @@ class InviteAction extends Action
     {
         parent::handle($args);
         if (!common_logged_in()) {
-            $this->client_error(sprintf(_('You must be logged in to invite other users to use %s'),
+            $this->clientError(sprintf(_('You must be logged in to invite other users to use %s'),
                                         common_config('site', 'name')));
             return;
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
diff --git a/actions/login.php b/actions/login.php
index f43de31ffd..5226458fb0 100644
--- a/actions/login.php
+++ b/actions/login.php
@@ -31,7 +31,7 @@ class LoginAction extends Action
     {
         parent::handle($args);
         if (common_is_real_login()) {
-            common_user_error(_('Already logged in.'));
+            $this->clientError(_('Already logged in.'));
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             $this->check_login();
         } else {
@@ -46,7 +46,7 @@ class LoginAction extends Action
         # CSRF protection - token set in common_notice_form()
         $token = $this->trimmed('token');
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_('There was a problem with your session token. Try again, please.'));
+            $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
 
@@ -55,7 +55,7 @@ class LoginAction extends Action
         if (common_check_user($nickname, $password)) {
             # success!
             if (!common_set_user($nickname)) {
-                common_server_error(_('Error setting user.'));
+                $this->serverError(_('Error setting user.'));
                 return;
             }
             common_real_login(true);
@@ -81,7 +81,7 @@ class LoginAction extends Action
 
         # success!
         if (!common_set_user($user)) {
-            common_server_error(_('Error setting user.'));
+            $this->serverError(_('Error setting user.'));
             return;
         }
 
diff --git a/actions/logout.php b/actions/logout.php
index 201378730d..3001f3613e 100644
--- a/actions/logout.php
+++ b/actions/logout.php
@@ -33,7 +33,7 @@ class LogoutAction extends Action
     {
         parent::handle($args);
         if (!common_logged_in()) {
-            common_user_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
         } else {
             common_set_user(null);
             common_real_login(false); # not logged in
diff --git a/actions/microsummary.php b/actions/microsummary.php
index 13ddc4e3ed..b46c5bee53 100644
--- a/actions/microsummary.php
+++ b/actions/microsummary.php
@@ -31,14 +31,14 @@ class MicrosummaryAction extends Action
         $user = User::staticGet('nickname', $nickname);
 
         if (!$user) {
-            $this->client_error(_('No such user'), 404);
+            $this->clientError(_('No such user'), 404);
             return;
         }
         
         $notice = $user->getCurrentNotice();
         
         if (!$notice) {
-            $this->client_error(_('No current status'), 404);
+            $this->clientError(_('No current status'), 404);
         }
         
         header('Content-Type: text/plain');
diff --git a/actions/newmessage.php b/actions/newmessage.php
index 6221b67e9d..510a5f8f37 100644
--- a/actions/newmessage.php
+++ b/actions/newmessage.php
@@ -27,7 +27,7 @@ class NewmessageAction extends Action
         parent::handle($args);
 
         if (!common_logged_in()) {
-            $this->client_error(_('Not logged in.'), 403);
+            $this->clientError(_('Not logged in.'), 403);
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             $this->save_new_message();
         } else {
@@ -71,10 +71,10 @@ class NewmessageAction extends Action
             $this->show_form(_('No recipient specified.'));
             return;
         } else if (!$user->mutuallySubscribed($other)) {
-            $this->client_error(_('You can\'t send a message to this user.'), 404);
+            $this->clientError(_('You can\'t send a message to this user.'), 404);
             return;
         } else if ($user->id == $other->id) {
-            $this->client_error(_('Don\'t send a message to yourself; just say it to yourself quietly instead.'), 403);
+            $this->clientError(_('Don\'t send a message to yourself; just say it to yourself quietly instead.'), 403);
             return;
         }
         
@@ -113,12 +113,12 @@ class NewmessageAction extends Action
         $other = User::staticGet('id', $to);
 
         if (!$other) {
-            $this->client_error(_('No such user'), 404);
+            $this->clientError(_('No such user'), 404);
             return;
         }
 
         if (!$user->mutuallySubscribed($other)) {
-            $this->client_error(_('You can\'t send a message to this user.'), 404);
+            $this->clientError(_('You can\'t send a message to this user.'), 404);
             return;
         }
         
diff --git a/actions/newnotice.php b/actions/newnotice.php
index 89792d95ac..cb02854a1d 100644
--- a/actions/newnotice.php
+++ b/actions/newnotice.php
@@ -29,13 +29,13 @@ class NewnoticeAction extends Action
         parent::handle($args);
 
         if (!common_logged_in()) {
-            common_user_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
 
             # CSRF protection - token set in common_notice_form()
             $token = $this->trimmed('token');
             if (!$token || $token != common_session_token()) {
-                $this->client_error(_('There was a problem with your session token. Try again, please.'));
+                $this->clientError(_('There was a problem with your session token. Try again, please.'));
                 return;
             }
 
diff --git a/actions/noticesearch.php b/actions/noticesearch.php
index d998b9da8f..336e39bd3a 100644
--- a/actions/noticesearch.php
+++ b/actions/noticesearch.php
@@ -97,7 +97,7 @@ class NoticesearchAction extends SearchAction
         $profile = $notice->getProfile();
         if (!$profile) {
             common_log_db_error($notice, 'SELECT', __FILE__);
-            $this->server_error(_('Notice without matching profile'));
+            $this->serverError(_('Notice without matching profile'));
             return;
         }
         # XXX: RDFa
diff --git a/actions/nudge.php b/actions/nudge.php
index de930e4628..49223d4315 100644
--- a/actions/nudge.php
+++ b/actions/nudge.php
@@ -29,7 +29,7 @@ class NudgeAction extends Action
         parent::handle($args);
 
         if (!common_logged_in()) {
-            $this->client_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
             return;
         }
 
@@ -46,12 +46,12 @@ class NudgeAction extends Action
         $token = $this->trimmed('token');
         
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_('There was a problem with your session token. Try again, please.'));
+            $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
 
         if (!$other->email || !$other->emailnotifynudge) {
-            $this->client_error(_('This user doesn\'t allow nudges or hasn\'t confirmed or set his email yet.'));
+            $this->clientError(_('This user doesn\'t allow nudges or hasn\'t confirmed or set his email yet.'));
             return;
         }
 
diff --git a/actions/openidlogin.php b/actions/openidlogin.php
index 82791af349..d1989e0dea 100644
--- a/actions/openidlogin.php
+++ b/actions/openidlogin.php
@@ -28,7 +28,7 @@ class OpenidloginAction extends Action
     {
         parent::handle($args);
         if (common_logged_in()) {
-            common_user_error(_('Already logged in.'));
+            $this->clientError(_('Already logged in.'));
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             $openid_url = $this->trimmed('openid_url');
 
diff --git a/actions/othersettings.php b/actions/othersettings.php
index 97cbd0094e..51f6f8197d 100644
--- a/actions/othersettings.php
+++ b/actions/othersettings.php
@@ -177,7 +177,7 @@ class OthersettingsAction extends SettingsAction
 
         if ($result === false) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t update user.'));
+            $this->serverError(_('Couldn\'t update user.'));
             return;
         }
 
diff --git a/actions/peopletag.php b/actions/peopletag.php
index 2680638d7c..7bcfcb93e3 100644
--- a/actions/peopletag.php
+++ b/actions/peopletag.php
@@ -32,7 +32,7 @@ class PeopletagAction extends Action
         $tag = $this->trimmed('tag');
         
         if (!common_valid_profile_tag($tag)) {
-            $this->client_error(sprintf(_('Not a valid people tag: %s'), $tag));
+            $this->clientError(sprintf(_('Not a valid people tag: %s'), $tag));
             return;
         }
 
diff --git a/actions/postnotice.php b/actions/postnotice.php
index dec62a678f..0b47352964 100644
--- a/actions/postnotice.php
+++ b/actions/postnotice.php
@@ -36,7 +36,7 @@ class PostnoticeAction extends Action
                 print "omb_version=".OMB_VERSION_01;
             }
         } catch (OAuthException $e) {
-            common_server_error($e->getMessage());
+            $this->serverError($e->getMessage());
             return;
         }
     }
@@ -45,36 +45,36 @@ class PostnoticeAction extends Action
     {
         $version = $req->get_parameter('omb_version');
         if ($version != OMB_VERSION_01) {
-            common_user_error(_('Unsupported OMB version'), 400);
+            $this->clientError(_('Unsupported OMB version'), 400);
             return false;
         }
         # First, check to see
         $listenee =  $req->get_parameter('omb_listenee');
         $remote_profile = Remote_profile::staticGet('uri', $listenee);
         if (!$remote_profile) {
-            common_user_error(_('Profile unknown'), 403);
+            $this->clientError(_('Profile unknown'), 403);
             return false;
         }
         $sub = Subscription::staticGet('token', $token->key);
         if (!$sub) {
-            common_user_error(_('No such subscription'), 403);
+            $this->clientError(_('No such subscription'), 403);
             return false;
         }
         $content = $req->get_parameter('omb_notice_content');
         $content_shortened = common_shorten_links($content);
         if (mb_strlen($content_shortened) > 140) {
-            common_user_error(_('Invalid notice content'), 400);
+            $this->clientError(_('Invalid notice content'), 400);
             return false;
         }
         $notice_uri = $req->get_parameter('omb_notice');
         if (!Validate::uri($notice_uri) &&
             !common_valid_tag($notice_uri)) {
-            common_user_error(_('Invalid notice uri'), 400);
+            $this->clientError(_('Invalid notice uri'), 400);
             return false;
         }
         $notice_url = $req->get_parameter('omb_notice_url');
         if ($notice_url && !common_valid_http_url($notice_url)) {
-            common_user_error(_('Invalid notice url'), 400);
+            $this->clientError(_('Invalid notice url'), 400);
             return false;
         }
         $notice = Notice::staticGet('uri', $notice_uri);
diff --git a/actions/profilesettings.php b/actions/profilesettings.php
index ef45fc1d9f..6ad3f2ef5c 100644
--- a/actions/profilesettings.php
+++ b/actions/profilesettings.php
@@ -125,7 +125,7 @@ class ProfilesettingsAction extends SettingsAction
 
         if (!$profile) {
             common_log_db_error($user, 'SELECT', __FILE__);
-            $this->server_error(_('User without matching profile'));
+            $this->serverError(_('User without matching profile'));
             return;
         }
         
@@ -298,7 +298,7 @@ class ProfilesettingsAction extends SettingsAction
 
             if ($result === false) {
                 common_log_db_error($user, 'UPDATE', __FILE__);
-                common_server_error(_('Couldn\'t update user.'));
+                $this->serverError(_('Couldn\'t update user.'));
                 return;
             } else {
                 # Re-initialize language environment if it changed
@@ -318,7 +318,7 @@ class ProfilesettingsAction extends SettingsAction
 
             if ($result === false) {
                 common_log_db_error($user, 'UPDATE', __FILE__);
-                common_server_error(_('Couldn\'t update user for autosubscribe.'));
+                $this->serverError(_('Couldn\'t update user for autosubscribe.'));
                 return;
             }
         }
@@ -341,7 +341,7 @@ class ProfilesettingsAction extends SettingsAction
 
         if (!$result) {
             common_log_db_error($profile, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t save profile.'));
+            $this->serverError(_('Couldn\'t save profile.'));
             return;
         }
 
@@ -350,7 +350,7 @@ class ProfilesettingsAction extends SettingsAction
         $result = $user->setSelfTags($tags);
 
         if (!$result) {
-            common_server_error(_('Couldn\'t save tags.'));
+            $this->serverError(_('Couldn\'t save tags.'));
             return;
         }
         
@@ -475,7 +475,7 @@ class ProfilesettingsAction extends SettingsAction
         }
 
         if (!$user->update($original)) {
-            common_server_error(_('Can\'t save new password.'));
+            $this->serverError(_('Can\'t save new password.'));
             return;
         }
 
diff --git a/actions/public.php b/actions/public.php
index 62071ecccd..0ceeef98e8 100644
--- a/actions/public.php
+++ b/actions/public.php
@@ -165,7 +165,7 @@ class PublicAction extends Action
                                        NOTICES_PER_PAGE + 1);
 
         if (!$notice) {
-            $this->server_error(_('Could not retrieve public stream.'));
+            $this->serverError(_('Could not retrieve public stream.'));
             return;
         }
 
diff --git a/actions/recoverpassword.php b/actions/recoverpassword.php
index 3e6ecfb1f9..3d839e7514 100644
--- a/actions/recoverpassword.php
+++ b/actions/recoverpassword.php
@@ -30,7 +30,7 @@ class RecoverpasswordAction extends Action
     {
         parent::handle($args);
         if (common_logged_in()) {
-            $this->client_error(_('You are already logged in!'));
+            $this->clientError(_('You are already logged in!'));
             return;
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             if ($this->arg('recover')) {
@@ -38,7 +38,7 @@ class RecoverpasswordAction extends Action
             } else if ($this->arg('reset')) {
                 $this->reset_password();
             } else {
-                $this->client_error(_('Unexpected form submission.'));
+                $this->clientError(_('Unexpected form submission.'));
             }
         } else {
             if ($this->trimmed('code')) {
@@ -56,18 +56,18 @@ class RecoverpasswordAction extends Action
         $confirm = Confirm_address::staticGet('code', $code);
 
         if (!$confirm) {
-            $this->client_error(_('No such recovery code.'));
+            $this->clientError(_('No such recovery code.'));
             return;
         }
         if ($confirm->address_type != 'recover') {
-            $this->client_error(_('Not a recovery code.'));
+            $this->clientError(_('Not a recovery code.'));
             return;
         }
 
         $user = User::staticGet($confirm->user_id);
 
         if (!$user) {
-            $this->server_error(_('Recovery code for unknown user.'));
+            $this->serverError(_('Recovery code for unknown user.'));
             return;
         }
 
@@ -80,7 +80,7 @@ class RecoverpasswordAction extends Action
 
         if (!$result) {
             common_log_db_error($confirm, 'DELETE', __FILE__);
-            common_server_error(_('Error with confirmation code.'));
+            $this->serverError(_('Error with confirmation code.'));
             return;
         }
 
@@ -91,7 +91,7 @@ class RecoverpasswordAction extends Action
             common_log(LOG_WARNING, 
                        'Attempted redemption on recovery code ' .
                        'that is ' . $touched . ' seconds old. ');
-            $this->client_error(_('This confirmation code is too old. ' .
+            $this->clientError(_('This confirmation code is too old. ' .
                                    'Please start again.'));
             return;
         }
@@ -105,7 +105,7 @@ class RecoverpasswordAction extends Action
             $result = $user->updateKeys($orig);
             if (!$result) {
                 common_log_db_error($user, 'UPDATE', __FILE__);
-                $this->server_error(_('Could not update user with confirmed email address.'));
+                $this->serverError(_('Could not update user with confirmed email address.'));
                 return;
             }
         }
@@ -240,7 +240,7 @@ class RecoverpasswordAction extends Action
         }
 
         if (!$user->email && !$confirm_email) {
-            $this->client_error(_('No registered email address for that user.'));
+            $this->clientError(_('No registered email address for that user.'));
             return;
         }
 
@@ -254,7 +254,7 @@ class RecoverpasswordAction extends Action
 
         if (!$confirm->insert()) {
             common_log_db_error($confirm, 'INSERT', __FILE__);
-            $this->server_error(_('Error saving address confirmation.'));
+            $this->serverError(_('Error saving address confirmation.'));
             return;
         }
 
@@ -298,7 +298,7 @@ class RecoverpasswordAction extends Action
         $user = $this->get_temp_user();
 
         if (!$user) {
-            $this->client_error(_('Unexpected password reset.'));
+            $this->clientError(_('Unexpected password reset.'));
             return;
         }
 
@@ -322,14 +322,14 @@ class RecoverpasswordAction extends Action
 
         if (!$user->update($original)) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            common_server_error(_('Can\'t save new password.'));
+            $this->serverError(_('Can\'t save new password.'));
             return;
         }
 
         $this->clear_temp_user();
 
         if (!common_set_user($user->nickname)) {
-            common_server_error(_('Error setting user.'));
+            $this->serverError(_('Error setting user.'));
             return;
         }
 
diff --git a/actions/register.php b/actions/register.php
index bac1796876..b4d0d43fb4 100644
--- a/actions/register.php
+++ b/actions/register.php
@@ -26,9 +26,9 @@ class RegisterAction extends Action
         parent::handle($args);
 
         if (common_config('site', 'closed')) {
-            common_user_error(_('Registration not allowed.'));
+            $this->clientError(_('Registration not allowed.'));
         } else if (common_logged_in()) {
-            common_user_error(_('Already logged in.'));
+            $this->clientError(_('Already logged in.'));
         } else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
             $this->try_register();
         } else {
@@ -65,7 +65,7 @@ class RegisterAction extends Action
         }
 
         if (common_config('site', 'inviteonly') && !($code && $invite)) {
-            $this->client_error(_('Sorry, only invited people can register.'));
+            $this->clientError(_('Sorry, only invited people can register.'));
             return;
         }
 
@@ -115,7 +115,7 @@ class RegisterAction extends Action
             }
             # success!
             if (!common_set_user($user)) {
-                common_server_error(_('Error setting user.'));
+                $this->serverError(_('Error setting user.'));
                 return;
             }
             # this is a real login
@@ -179,7 +179,7 @@ class RegisterAction extends Action
         }
 
         if (common_config('site', 'inviteonly') && !($code && $invite)) {
-            $this->client_error(_('Sorry, only invited people can register.'));
+            $this->clientError(_('Sorry, only invited people can register.'));
             return;
         }
 
diff --git a/actions/remotesubscribe.php b/actions/remotesubscribe.php
index b9e29d645d..32e9bf3d37 100644
--- a/actions/remotesubscribe.php
+++ b/actions/remotesubscribe.php
@@ -30,7 +30,7 @@ class RemotesubscribeAction extends Action
         parent::handle($args);
 
         if (common_logged_in()) {
-            common_user_error(_('You can use the local subscription!'));
+            $this->clientError(_('You can use the local subscription!'));
             return;
         }
 
@@ -342,7 +342,7 @@ class RemotesubscribeAction extends Action
         $profile = $user->getProfile();
         if (!$profile) {
             common_log_db_error($user, 'SELECT', __FILE__);
-            $this->server_error(_('User without matching profile'));
+            $this->serverError(_('User without matching profile'));
             return;
         }
 
diff --git a/actions/replies.php b/actions/replies.php
index 8785508884..84fd894ff0 100644
--- a/actions/replies.php
+++ b/actions/replies.php
@@ -40,7 +40,7 @@ class RepliesAction extends StreamAction
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'));
+            $this->serverError(_('User has no profile.'));
             return;
         }
 
@@ -57,7 +57,7 @@ class RepliesAction extends StreamAction
 
     function no_such_user()
     {
-        common_user_error(_('No such user.'));
+        $this->clientError(_('No such user.'));
     }
 
     function show_header($user)
diff --git a/actions/repliesrss.php b/actions/repliesrss.php
index 5f85f8d2e8..43be133a43 100644
--- a/actions/repliesrss.php
+++ b/actions/repliesrss.php
@@ -34,7 +34,7 @@ class RepliesrssAction extends Rss10Action
         $this->user = User::staticGet('nickname', $nickname);
 
         if (!$this->user) {
-            common_user_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
             return false;
         } else {
             return true;
diff --git a/actions/requesttoken.php b/actions/requesttoken.php
index a745487393..378db44030 100644
--- a/actions/requesttoken.php
+++ b/actions/requesttoken.php
@@ -39,7 +39,7 @@ class RequesttokenAction extends Action
             $token = $server->fetch_request_token($req);
             print $token;
         } catch (OAuthException $e) {
-            common_server_error($e->getMessage());
+            $this->serverError($e->getMessage());
         }
     }
 }
diff --git a/actions/showfavorites.php b/actions/showfavorites.php
index 1dec3ba5ba..caa823893d 100644
--- a/actions/showfavorites.php
+++ b/actions/showfavorites.php
@@ -33,14 +33,14 @@ class ShowfavoritesAction extends StreamAction
         $user = User::staticGet('nickname', $nickname);
 
         if (!$user) {
-            $this->client_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
             return;
         }
 
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'));
+            $this->serverError(_('User has no profile.'));
             return;
         }
 
@@ -90,7 +90,7 @@ class ShowfavoritesAction extends StreamAction
         $notice = $user->favoriteNotices(($page-1)*NOTICES_PER_PAGE, NOTICES_PER_PAGE + 1);
 
         if (!$notice) {
-            $this->server_error(_('Could not retrieve favorite notices.'));
+            $this->serverError(_('Could not retrieve favorite notices.'));
             return;
         }
 
diff --git a/actions/showmessage.php b/actions/showmessage.php
index 25330a568f..d13e9f671f 100644
--- a/actions/showmessage.php
+++ b/actions/showmessage.php
@@ -32,7 +32,7 @@ class ShowmessageAction extends MailboxAction
         $message = $this->get_message();
 
         if (!$message) {
-            $this->client_error(_('No such message.'), 404);
+            $this->clientError(_('No such message.'), 404);
             return;
         }
         
@@ -41,7 +41,7 @@ class ShowmessageAction extends MailboxAction
         if ($cur && ($cur->id == $message->from_profile || $cur->id == $message->to_profile)) {
             $this->show_page($cur, 1);
         } else {
-            $this->client_error(_('Only the sender and recipient may read this message.'), 403);
+            $this->clientError(_('Only the sender and recipient may read this message.'), 403);
             return;
         }
     }
diff --git a/actions/shownotice.php b/actions/shownotice.php
index c519af0ba3..82d4bd2701 100644
--- a/actions/shownotice.php
+++ b/actions/shownotice.php
@@ -37,14 +37,14 @@ class ShownoticeAction extends StreamAction
         $this->notice = Notice::staticGet($id);
 
         if (!$this->notice) {
-            $this->client_error(_('No such notice.'), 404);
+            $this->clientError(_('No such notice.'), 404);
             return false;
         }
 
         $this->profile = $this->notice->getProfile();
 
         if (!$this->profile) {
-            $this->server_error(_('Notice has no profile'), 500);
+            $this->serverError(_('Notice has no profile'), 500);
             return false;
         }
 
@@ -119,6 +119,6 @@ class ShownoticeAction extends StreamAction
 
     function no_such_notice()
     {
-        common_user_error(_('No such notice.'));
+        $this->clientError(_('No such notice.'));
     }
 }
diff --git a/actions/showstream.php b/actions/showstream.php
index 9a59f7ae45..ed38c67f95 100644
--- a/actions/showstream.php
+++ b/actions/showstream.php
@@ -56,7 +56,7 @@ class ShowstreamAction extends StreamAction
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'));
+            $this->serverError(_('User has no profile.'));
             return;
         }
 
@@ -159,7 +159,7 @@ class ShowstreamAction extends StreamAction
 
     function no_such_user()
     {
-        $this->client_error(_('No such user.'), 404);
+        $this->clientError(_('No such user.'), 404);
     }
 
     function show_profile($profile)
diff --git a/actions/smssettings.php b/actions/smssettings.php
index 1be45d1cec..c5879e4d95 100644
--- a/actions/smssettings.php
+++ b/actions/smssettings.php
@@ -168,7 +168,7 @@ class SmssettingsAction extends EmailsettingsAction
 
         if ($result === false) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t update user.'));
+            $this->serverError(_('Couldn\'t update user.'));
             return;
         }
 
@@ -218,7 +218,7 @@ class SmssettingsAction extends EmailsettingsAction
 
         if ($result === false) {
             common_log_db_error($confirm, 'INSERT', __FILE__);
-            common_server_error(_('Couldn\'t insert confirmation code.'));
+            $this->serverError(_('Couldn\'t insert confirmation code.'));
             return;
         }
 
@@ -254,7 +254,7 @@ class SmssettingsAction extends EmailsettingsAction
 
         if (!$result) {
             common_log_db_error($confirm, 'DELETE', __FILE__);
-            $this->server_error(_('Couldn\'t delete email confirmation.'));
+            $this->serverError(_('Couldn\'t delete email confirmation.'));
             return;
         }
 
@@ -283,7 +283,7 @@ class SmssettingsAction extends EmailsettingsAction
         $result = $user->updateKeys($original);
         if (!$result) {
             common_log_db_error($user, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t update user.'));
+            $this->serverError(_('Couldn\'t update user.'));
             return;
         }
         $user->query('COMMIT');
diff --git a/actions/subedit.php b/actions/subedit.php
index 1142b7a032..e22384869b 100644
--- a/actions/subedit.php
+++ b/actions/subedit.php
@@ -30,28 +30,28 @@ class SubeditAction extends Action
         parent::prepare($args);
 
         if (!common_logged_in()) {
-            $this->client_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
             return false;
         }
 
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_('There was a problem with your session token. Try again, please.'));
+            $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
 
         $id = $this->trimmed('profile');
 
         if (!$id) {
-            $this->client_error(_('No profile specified.'));
+            $this->clientError(_('No profile specified.'));
             return false;
         }
 
         $this->profile = Profile::staticGet('id', $id);
 
         if (!$this->profile) {
-            $this->client_error(_('No profile with that ID.'));
+            $this->clientError(_('No profile with that ID.'));
             return false;
         }
 
@@ -68,7 +68,7 @@ class SubeditAction extends Action
                                                'subscribed' => $this->profile->id));
 
             if (!$sub) {
-                $this->client_error(_('You are not subscribed to that profile.'));
+                $this->clientError(_('You are not subscribed to that profile.'));
                 return false;
             }
 
@@ -81,7 +81,7 @@ class SubeditAction extends Action
 
             if (!$result) {
                 common_log_db_error($sub, 'UPDATE', __FILE__);
-                $this->server_error(_('Could not save subscription.'));
+                $this->serverError(_('Could not save subscription.'));
                 return false;
             }
 
diff --git a/actions/subscribe.php b/actions/subscribe.php
index 99f9acc241..b6f03f0f13 100644
--- a/actions/subscribe.php
+++ b/actions/subscribe.php
@@ -27,7 +27,7 @@ class SubscribeAction extends Action
         parent::handle($args);
 
         if (!common_logged_in()) {
-            common_user_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
             return;
         }
 
@@ -43,7 +43,7 @@ class SubscribeAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_('There was a problem with your session token. Try again, please.'));
+            $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
 
@@ -52,14 +52,14 @@ class SubscribeAction extends Action
         $other = User::staticGet('id', $other_id);
 
         if (!$other) {
-            $this->client_error(_('Not a local user.'));
+            $this->clientError(_('Not a local user.'));
             return;
         }
 
         $result = subs_subscribe_to($user, $other);
 
         if($result != true) {
-            common_user_error($result);
+            $this->clientError($result);
             return;
         }
 
diff --git a/actions/tagother.php b/actions/tagother.php
index f0105ec8b7..e11e3a00df 100644
--- a/actions/tagother.php
+++ b/actions/tagother.php
@@ -30,7 +30,7 @@ class TagotherAction extends Action
         parent::handle($args);
 
         if (!common_logged_in()) {
-            $this->client_error(_('Not logged in'), 403);
+            $this->clientError(_('Not logged in'), 403);
             return;
         }
 
@@ -39,12 +39,12 @@ class TagotherAction extends Action
         } else {
             $id = $this->trimmed('id');
             if (!$id) {
-                $this->client_error(_('No id argument.'));
+                $this->clientError(_('No id argument.'));
                 return;
             }
             $profile = Profile::staticGet('id', $id);
             if (!$profile) {
-                $this->client_error(_('No profile with that ID.'));
+                $this->clientError(_('No profile with that ID.'));
                 return;
             }
             $this->show_form($profile);
@@ -121,7 +121,7 @@ class TagotherAction extends Action
         $profile = Profile::staticGet('id', $id);
 
         if (!$profile) {
-            $this->client_error(_('No such profile.'));
+            $this->clientError(_('No such profile.'));
             return;
         }
 
@@ -147,14 +147,14 @@ class TagotherAction extends Action
             !Subscription::pkeyGet(array('subscriber' => $profile->id,
                                          'subscribed' => $user->id)))
         {
-            $this->client_error(_('You can only tag people you are subscribed to or who are subscribed to you.'));
+            $this->clientError(_('You can only tag people you are subscribed to or who are subscribed to you.'));
             return;
         }
 
         $result = Profile_tag::setTags($user->id, $profile->id, $tags);
 
         if (!$result) {
-            $this->client_error(_('Could not save tags.'));
+            $this->clientError(_('Could not save tags.'));
             return;
         }
 
diff --git a/actions/tagrss.php b/actions/tagrss.php
index 912d71413d..b0227ab391 100644
--- a/actions/tagrss.php
+++ b/actions/tagrss.php
@@ -32,7 +32,7 @@ class TagrssAction extends Rss10Action
         $this->tag = Notice_tag::staticGet('tag', $tag);
 
         if (!$this->tag) {
-            common_user_error(_('No such tag.'));
+            $this->clientError(_('No such tag.'));
             return false;
         } else {
             return true;
diff --git a/actions/twitapiaccount.php b/actions/twitapiaccount.php
index 79e1ed990d..e51a29a2d0 100644
--- a/actions/twitapiaccount.php
+++ b/actions/twitapiaccount.php
@@ -29,7 +29,7 @@ class TwitapiaccountAction extends TwitterapiAction
         parent::handle($args);
 
         if (!in_array($apidata['content-type'], array('xml', 'json'))) {
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
             return;
         }
 
@@ -39,7 +39,7 @@ class TwitapiaccountAction extends TwitterapiAction
     function end_session($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 
     function update_location($args, $apidata)
@@ -47,7 +47,7 @@ class TwitapiaccountAction extends TwitterapiAction
         parent::handle($args);
 
         if ($_SERVER['REQUEST_METHOD'] != 'POST') {
-            $this->client_error(_('This method requires a POST.'), 400, $apidata['content-type']);
+            $this->clientError(_('This method requires a POST.'), 400, $apidata['content-type']);
             return;
         }
 
@@ -56,7 +56,7 @@ class TwitapiaccountAction extends TwitterapiAction
         if (!is_null($location) && strlen($location) > 255) {
 
             // XXX: But Twitter just truncates and runs with it. -- Zach
-            $this->client_error(_('That\'s too long. Max notice size is 255 chars.'), 406, $apidate['content-type']);
+            $this->clientError(_('That\'s too long. Max notice size is 255 chars.'), 406, $apidate['content-type']);
             return;
         }
 
@@ -64,7 +64,7 @@ class TwitapiaccountAction extends TwitterapiAction
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'));
+            $this->serverError(_('User has no profile.'));
             return;
         }
 
@@ -75,7 +75,7 @@ class TwitapiaccountAction extends TwitterapiAction
 
         if (!$result) {
             common_log_db_error($profile, 'UPDATE', __FILE__);
-            common_server_error(_('Couldn\'t save profile.'));
+            $this->serverError(_('Couldn\'t save profile.'));
             return;
         }
 
@@ -91,12 +91,12 @@ class TwitapiaccountAction extends TwitterapiAction
     function update_delivery_device($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 
     function rate_limit_status($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 }
\ No newline at end of file
diff --git a/actions/twitapiblocks.php b/actions/twitapiblocks.php
index 5d64f2f7d8..8135adef3c 100644
--- a/actions/twitapiblocks.php
+++ b/actions/twitapiblocks.php
@@ -32,7 +32,7 @@ class TwitapiblocksAction extends TwitterapiAction
         $blockee = $this->get_user($apidata['api_arg'], $apidata);
 
         if (!$blockee) {
-            $this->client_error('Not Found', 404, $apidata['content-type']);
+            $this->clientError('Not Found', 404, $apidata['content-type']);
             return;
         }
 
@@ -44,7 +44,7 @@ class TwitapiblocksAction extends TwitterapiAction
             $this->show_profile($blockee, $type);
             $this->end_document($type);
         } else {
-            common_server_error(_('Block user failed.'));
+            $this->serverError(_('Block user failed.'));
         }
     }
 
@@ -54,7 +54,7 @@ class TwitapiblocksAction extends TwitterapiAction
         $blockee = $this->get_user($apidata['api_arg'], $apidata);
 
         if (!$blockee) {
-            $this->client_error('Not Found', 404, $apidata['content-type']);
+            $this->clientError('Not Found', 404, $apidata['content-type']);
             return;
         }
 
@@ -66,7 +66,7 @@ class TwitapiblocksAction extends TwitterapiAction
             $this->show_profile($blockee, $type);
             $this->end_document($type);
         } else {
-            common_server_error(_('Unblock user failed.'));
+            $this->serverError(_('Unblock user failed.'));
         }
     }
 }
\ No newline at end of file
diff --git a/actions/twitapidirect_messages.php b/actions/twitapidirect_messages.php
index 36d2a7e09d..db55e8cd02 100644
--- a/actions/twitapidirect_messages.php
+++ b/actions/twitapidirect_messages.php
@@ -108,7 +108,7 @@ class Twitapidirect_messagesAction extends TwitterapiAction
             $this->show_json_dmsgs($message);
             break;
          default:
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
         }
 
     }
@@ -119,7 +119,7 @@ class Twitapidirect_messagesAction extends TwitterapiAction
         parent::handle($args);
 
         if ($_SERVER['REQUEST_METHOD'] != 'POST') {
-            $this->client_error(_('This method requires a POST.'), 400, $apidata['content-type']);
+            $this->clientError(_('This method requires a POST.'), 400, $apidata['content-type']);
             return;
         }
 
@@ -134,11 +134,11 @@ class Twitapidirect_messagesAction extends TwitterapiAction
         $content = $this->trimmed('text');
 
         if (!$content) {
-            $this->client_error(_('No message text!'), $code = 406, $apidata['content-type']);
+            $this->clientError(_('No message text!'), $code = 406, $apidata['content-type']);
         } else {
             $content_shortened = common_shorten_links($content);
             if (mb_strlen($content_shortened) > 140) {
-                $this->client_error(_('That\'s too long. Max message size is 140 chars.'),
+                $this->clientError(_('That\'s too long. Max message size is 140 chars.'),
                     $code = 406, $apidata['content-type']);
                 return;
             }
@@ -147,15 +147,15 @@ class Twitapidirect_messagesAction extends TwitterapiAction
         $other = $this->get_user($this->trimmed('user'));
 
         if (!$other) {
-            $this->client_error(_('Recipient user not found.'), $code = 403, $apidata['content-type']);
+            $this->clientError(_('Recipient user not found.'), $code = 403, $apidata['content-type']);
             return;
         } else if (!$user->mutuallySubscribed($other)) {
-            $this->client_error(_('Can\'t send direct messages to users who aren\'t your friend.'),
+            $this->clientError(_('Can\'t send direct messages to users who aren\'t your friend.'),
                 $code = 403, $apidata['content-type']);
             return;
         } else if ($user->id == $other->id) {
             // Sending msgs to yourself is allowed by Twitter
-            $this->client_error(_('Don\'t send a message to yourself; just say it to yourself quietly instead.'),
+            $this->clientError(_('Don\'t send a message to yourself; just say it to yourself quietly instead.'),
                 $code = 403, $apidata['content-type']);
             return;
         }
@@ -164,7 +164,7 @@ class Twitapidirect_messagesAction extends TwitterapiAction
             html_entity_decode($content, ENT_NOQUOTES, 'UTF-8'), $source);
 
         if (is_string($message)) {
-            $this->server_error($message);
+            $this->serverError($message);
             return;
         }
 
@@ -181,7 +181,7 @@ class Twitapidirect_messagesAction extends TwitterapiAction
     function destroy($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 
     function show_xml_dmsgs($message)
diff --git a/actions/twitapifavorites.php b/actions/twitapifavorites.php
index 55e04732f5..737b7229f0 100644
--- a/actions/twitapifavorites.php
+++ b/actions/twitapifavorites.php
@@ -32,14 +32,14 @@ class TwitapifavoritesAction extends TwitterapiAction
         $user = $this->get_user($apidata['api_arg'], $apidata);
 
         if (!$user) {
-            $this->client_error('Not Found', 404, $apidata['content-type']);
+            $this->clientError('Not Found', 404, $apidata['content-type']);
             return;
         }
 
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'));
+            $this->serverError(_('User has no profile.'));
             return;
         }
 
@@ -56,7 +56,7 @@ class TwitapifavoritesAction extends TwitterapiAction
         $notice = $user->favoriteNotices((($page-1)*20), $count);
 
         if (!$notice) {
-            common_server_error(_('Could not retrieve favorite notices.'));
+            $this->serverError(_('Could not retrieve favorite notices.'));
             return;
         }
 
@@ -82,7 +82,7 @@ class TwitapifavoritesAction extends TwitterapiAction
             $this->show_json_timeline($notice);
             break;
          default:
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
         }
 
     }
@@ -94,12 +94,12 @@ class TwitapifavoritesAction extends TwitterapiAction
         // Check for RESTfulness
         if (!in_array($_SERVER['REQUEST_METHOD'], array('POST', 'DELETE'))) {
             // XXX: Twitter just prints the err msg, no XML / JSON.
-            $this->client_error(_('This method requires a POST or DELETE.'), 400, $apidata['content-type']);
+            $this->clientError(_('This method requires a POST or DELETE.'), 400, $apidata['content-type']);
             return;
         }
 
         if (!in_array($apidata['content-type'], array('xml', 'json'))) {
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
             return;
         }
 
@@ -109,20 +109,20 @@ class TwitapifavoritesAction extends TwitterapiAction
         $notice = Notice::staticGet($notice_id);
 
         if (!$notice) {
-            $this->client_error(_('No status found with that ID.'), 404, $apidata['content-type']);
+            $this->clientError(_('No status found with that ID.'), 404, $apidata['content-type']);
             return;
         }
 
         // XXX: Twitter lets you fave things repeatedly via api.
         if ($user->hasFave($notice)) {
-            $this->client_error(_('This notice is already a favorite!'), 403, $apidata['content-type']);
+            $this->clientError(_('This notice is already a favorite!'), 403, $apidata['content-type']);
             return;
         }
 
         $fave = Fave::addNew($user, $notice);
 
         if (!$fave) {
-            common_server_error(_('Could not create favorite.'));
+            $this->serverError(_('Could not create favorite.'));
             return;
         }
 
@@ -140,7 +140,7 @@ class TwitapifavoritesAction extends TwitterapiAction
     function destroy($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 
     // XXX: these two funcs swiped from faves.  Maybe put in util.php, or some common base class?
diff --git a/actions/twitapifriendships.php b/actions/twitapifriendships.php
index 458ff48a54..c50c5e84a9 100644
--- a/actions/twitapifriendships.php
+++ b/actions/twitapifriendships.php
@@ -29,7 +29,7 @@ class TwitapifriendshipsAction extends TwitterapiAction
         parent::handle($args);
 
         if ($_SERVER['REQUEST_METHOD'] != 'POST') {
-            $this->client_error(_('This method requires a POST.'), 400, $apidata['content-type']);
+            $this->clientError(_('This method requires a POST.'), 400, $apidata['content-type']);
             return;
         }
 
@@ -38,7 +38,7 @@ class TwitapifriendshipsAction extends TwitterapiAction
         $other = $this->get_user($id);
 
         if (!$other) {
-            $this->client_error(_('Could not follow user: User not found.'), 403, $apidata['content-type']);
+            $this->clientError(_('Could not follow user: User not found.'), 403, $apidata['content-type']);
             return;
         }
 
@@ -46,7 +46,7 @@ class TwitapifriendshipsAction extends TwitterapiAction
 
         if ($user->isSubscribed($other)) {
             $errmsg = sprintf(_('Could not follow user: %s is already on your list.'), $other->nickname);
-            $this->client_error($errmsg, 403, $apidata['content-type']);
+            $this->clientError($errmsg, 403, $apidata['content-type']);
             return;
         }
 
@@ -62,7 +62,7 @@ class TwitapifriendshipsAction extends TwitterapiAction
 
         if (!$result) {
             $errmsg = sprintf(_('Could not follow user: %s is already on your list.'), $other->nickname);
-            $this->client_error($errmsg, 400, $apidata['content-type']);
+            $this->clientError($errmsg, 400, $apidata['content-type']);
             return;
         }
 
@@ -82,7 +82,7 @@ class TwitapifriendshipsAction extends TwitterapiAction
         parent::handle($args);
 
         if (!in_array($_SERVER['REQUEST_METHOD'], array('POST', 'DELETE'))) {
-            $this->client_error(_('This method requires a POST or DELETE.'), 400, $apidata['content-type']);
+            $this->clientError(_('This method requires a POST or DELETE.'), 400, $apidata['content-type']);
             return;
         }
 
@@ -102,7 +102,7 @@ class TwitapifriendshipsAction extends TwitterapiAction
             $sub->delete();
             $sub->query('COMMIT');
         } else {
-            $this->client_error(_('You are not friends with the specified user.'), 403, $apidata['content-type']);
+            $this->clientError(_('You are not friends with the specified user.'), 403, $apidata['content-type']);
             return;
         }
 
@@ -118,7 +118,7 @@ class TwitapifriendshipsAction extends TwitterapiAction
         parent::handle($args);
 
         if (!in_array($apidata['content-type'], array('xml', 'json'))) {
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
             return;
         }
 
@@ -129,7 +129,7 @@ class TwitapifriendshipsAction extends TwitterapiAction
         $user_b = $this->get_user($user_b_id);
 
         if (!$user_a || !$user_b) {
-            $this->client_error(_('Two user ids or screen_names must be supplied.'), 400, $apidata['content-type']);
+            $this->clientError(_('Two user ids or screen_names must be supplied.'), 400, $apidata['content-type']);
             return;
         }
 
diff --git a/actions/twitapihelp.php b/actions/twitapihelp.php
index 531c6e9d31..db5892baf2 100644
--- a/actions/twitapihelp.php
+++ b/actions/twitapihelp.php
@@ -41,7 +41,7 @@ class TwitapihelpAction extends TwitterapiAction
             print '"ok"';
             $this->end_document('json');
         } else {
-            common_user_error(_('API method not found!'), $code=404);
+            $this->clientError(_('API method not found!'), $code=404);
         }
 
     }
@@ -49,7 +49,7 @@ class TwitapihelpAction extends TwitterapiAction
     function downtime_schedule($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 
 }
\ No newline at end of file
diff --git a/actions/twitapilaconica.php b/actions/twitapilaconica.php
index 34c8f88fc4..8cd7a64b9f 100644
--- a/actions/twitapilaconica.php
+++ b/actions/twitapilaconica.php
@@ -79,7 +79,7 @@ class TwitapilaconicaAction extends TwitterapiAction
             $this->end_document('json');
             break;
          default:
-            $this->client_error(_('API method not found!'), $code=404);
+            $this->clientError(_('API method not found!'), $code=404);
         }
     }
 
@@ -148,7 +148,7 @@ class TwitapilaconicaAction extends TwitterapiAction
             $this->end_document('json');
             break;
          default:
-            $this->client_error(_('API method not found!'), $code=404);
+            $this->clientError(_('API method not found!'), $code=404);
         }
     }
 
@@ -169,6 +169,6 @@ class TwitapilaconicaAction extends TwitterapiAction
     function wadl($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), 501);
+        $this->serverError(_('API method under construction.'), 501);
     }
 }
diff --git a/actions/twitapinotifications.php b/actions/twitapinotifications.php
index a19d652c3d..411971af16 100644
--- a/actions/twitapinotifications.php
+++ b/actions/twitapinotifications.php
@@ -28,13 +28,13 @@ class TwitapinotificationsAction extends TwitterapiAction
     function follow($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 
     function leave($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 
 }
\ No newline at end of file
diff --git a/actions/twitapistatuses.php b/actions/twitapistatuses.php
index 8d175ecab8..a35f4b12ea 100644
--- a/actions/twitapistatuses.php
+++ b/actions/twitapistatuses.php
@@ -76,12 +76,12 @@ class TwitapistatusesAction extends TwitterapiAction
                     $this->show_json_timeline($notice);
                     break;
                 default:
-                    common_user_error(_('API method not found!'), $code = 404);
+                    $this->clientError(_('API method not found!'), $code = 404);
                     break;
             }
 
         } else {
-            common_server_error(_('Couldn\'t find any statuses.'), $code = 503);
+            $this->serverError(_('Couldn\'t find any statuses.'), $code = 503);
         }
 
     }
@@ -144,7 +144,7 @@ class TwitapistatusesAction extends TwitterapiAction
             $this->show_json_timeline($notice);
             break;
          default:
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
         }
 
     }
@@ -157,14 +157,14 @@ class TwitapistatusesAction extends TwitterapiAction
         $user = $this->get_user($apidata['api_arg'], $apidata);
 
         if (!$user) {
-            $this->client_error('Not Found', 404, $apidata['content-type']);
+            $this->clientError('Not Found', 404, $apidata['content-type']);
             return;
         }
 
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'));
+            $this->serverError(_('User has no profile.'));
             return;
         }
 
@@ -225,7 +225,7 @@ class TwitapistatusesAction extends TwitterapiAction
             $this->show_json_timeline($notice);
             break;
          default:
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
         }
 
     }
@@ -236,12 +236,12 @@ class TwitapistatusesAction extends TwitterapiAction
         parent::handle($args);
 
         if (!in_array($apidata['content-type'], array('xml', 'json'))) {
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
             return;
         }
 
         if ($_SERVER['REQUEST_METHOD'] != 'POST') {
-            $this->client_error(_('This method requires a POST.'), 400, $apidata['content-type']);
+            $this->clientError(_('This method requires a POST.'), 400, $apidata['content-type']);
             return;
         }
 
@@ -273,7 +273,7 @@ class TwitapistatusesAction extends TwitterapiAction
                 // as "truncated." Sending this error may screw up some clients
                 // that assume Twitter will truncate for them.    Should we just
                 // truncate too? -- Zach
-                $this->client_error(_('That\'s too long. Max notice size is 140 chars.'), $code = 406, $apidata['content-type']);
+                $this->clientError(_('That\'s too long. Max notice size is 140 chars.'), $code = 406, $apidata['content-type']);
                 return;
 
             }
@@ -306,7 +306,7 @@ class TwitapistatusesAction extends TwitterapiAction
                 if ($reply) {
                     $reply_to = $in_reply_to_status_id;
                 } else {
-                    $this->client_error(_('Not found'), $code = 404, $apidata['content-type']);
+                    $this->clientError(_('Not found'), $code = 404, $apidata['content-type']);
                     return;
                 }
             }
@@ -315,7 +315,7 @@ class TwitapistatusesAction extends TwitterapiAction
                 $source, 1, $reply_to);
 
             if (is_string($notice)) {
-                $this->server_error($notice);
+                $this->serverError($notice);
                 return;
             }
 
@@ -389,7 +389,7 @@ class TwitapistatusesAction extends TwitterapiAction
             $this->show_json_timeline($notices);
             break;
          default:
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
         }
 
     }
@@ -399,7 +399,7 @@ class TwitapistatusesAction extends TwitterapiAction
         parent::handle($args);
 
         if (!in_array($apidata['content-type'], array('xml', 'json'))) {
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
             return;
         }
 
@@ -415,7 +415,7 @@ class TwitapistatusesAction extends TwitterapiAction
             }
         } else {
             // XXX: Twitter just sets a 404 header and doens't bother to return an err msg
-            $this->client_error(_('No status with that ID found.'), 404, $apidata['content-type']);
+            $this->clientError(_('No status with that ID found.'), 404, $apidata['content-type']);
         }
 
     }
@@ -426,14 +426,14 @@ class TwitapistatusesAction extends TwitterapiAction
         parent::handle($args);
 
         if (!in_array($apidata['content-type'], array('xml', 'json'))) {
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
             return;
         }
 
         // Check for RESTfulness
         if (!in_array($_SERVER['REQUEST_METHOD'], array('POST', 'DELETE'))) {
             // XXX: Twitter just prints the err msg, no XML / JSON.
-            $this->client_error(_('This method requires a POST or DELETE.'), 400, $apidata['content-type']);
+            $this->clientError(_('This method requires a POST or DELETE.'), 400, $apidata['content-type']);
             return;
         }
 
@@ -443,7 +443,7 @@ class TwitapistatusesAction extends TwitterapiAction
         $notice = Notice::staticGet($notice_id);
 
         if (!$notice) {
-            $this->client_error(_('No status found with that ID.'), 404, $apidata['content-type']);
+            $this->clientError(_('No status found with that ID.'), 404, $apidata['content-type']);
             return;
         }
 
@@ -460,7 +460,7 @@ class TwitapistatusesAction extends TwitterapiAction
                 $this->show_single_json_status($notice);
             }
         } else {
-            $this->client_error(_('You may not delete another user\'s status.'), 403, $apidata['content-type']);
+            $this->clientError(_('You may not delete another user\'s status.'), 403, $apidata['content-type']);
         }
 
     }
@@ -487,7 +487,7 @@ class TwitapistatusesAction extends TwitterapiAction
         $user = $this->get_user($apidata['api_arg'], $apidata);
 
         if (!$user) {
-            $this->client_error('Not Found', 404, $apidata['content-type']);
+            $this->clientError('Not Found', 404, $apidata['content-type']);
             return;
         }
 
@@ -500,7 +500,7 @@ class TwitapistatusesAction extends TwitterapiAction
         $profile = $user->getProfile();
 
         if (!$profile) {
-            common_server_error(_('User has no profile.'));
+            $this->serverError(_('User has no profile.'));
             return;
         }
 
@@ -552,14 +552,14 @@ class TwitapistatusesAction extends TwitterapiAction
             print json_encode($arrays);
             break;
          default:
-            $this->client_error(_('unsupported file type'));
+            $this->clientError(_('unsupported file type'));
         }
     }
 
     function featured($args, $apidata)
     {
         parent::handle($args);
-        common_server_error(_('API method under construction.'), $code=501);
+        $this->serverError(_('API method under construction.'), $code=501);
     }
 
     function supported($cmd)
diff --git a/actions/twitapiusers.php b/actions/twitapiusers.php
index 409986985c..ed24175611 100644
--- a/actions/twitapiusers.php
+++ b/actions/twitapiusers.php
@@ -29,7 +29,7 @@ class TwitapiusersAction extends TwitterapiAction
         parent::handle($args);
 
         if (!in_array($apidata['content-type'], array('xml', 'json'))) {
-            common_user_error(_('API method not found!'), $code = 404);
+            $this->clientError(_('API method not found!'), $code = 404);
             return;
         }
 
@@ -44,7 +44,7 @@ class TwitapiusersAction extends TwitterapiAction
 
         if (!$user) {
             // XXX: Twitter returns a random(?) user instead of throwing and err! -- Zach
-            $this->client_error(_('Not found.'), 404, $apidata['content-type']);
+            $this->clientError(_('Not found.'), 404, $apidata['content-type']);
             return;
         }
 
diff --git a/actions/twittersettings.php b/actions/twittersettings.php
index 6636880375..9c879c9650 100644
--- a/actions/twittersettings.php
+++ b/actions/twittersettings.php
@@ -285,7 +285,7 @@ class TwittersettingsAction extends SettingsAction
 
         if (!$result) {
             common_log_db_error($flink, 'DELETE', __FILE__);
-            common_server_error(_('Couldn\'t remove Twitter user.'));
+            $this->serverError(_('Couldn\'t remove Twitter user.'));
             return;
         }
 
diff --git a/actions/unblock.php b/actions/unblock.php
index 112304f71b..59270f8821 100644
--- a/actions/unblock.php
+++ b/actions/unblock.php
@@ -30,28 +30,28 @@ class UnblockAction extends Action
         parent::prepare($args);
 
         if (!common_logged_in()) {
-            $this->client_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
             return false;
         }
 
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_('There was a problem with your session token. Try again, please.'));
+            $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
 
         $id = $this->trimmed('unblockto');
 
         if (!$id) {
-            $this->client_error(_('No profile specified.'));
+            $this->clientError(_('No profile specified.'));
             return false;
         }
 
         $this->profile = Profile::staticGet('id', $id);
 
         if (!$this->profile) {
-            $this->client_error(_('No profile with that ID.'));
+            $this->clientError(_('No profile with that ID.'));
             return false;
         }
 
@@ -74,7 +74,7 @@ class UnblockAction extends Action
         $result = $cur->unblock($this->profile);
 
         if (!$result) {
-            $this->server_error(_('Error removing the block.'));
+            $this->serverError(_('Error removing the block.'));
             return;
         }
 
diff --git a/actions/unsubscribe.php b/actions/unsubscribe.php
index 455c5e28e8..32511a4b49 100644
--- a/actions/unsubscribe.php
+++ b/actions/unsubscribe.php
@@ -24,7 +24,7 @@ class UnsubscribeAction extends Action
     {
         parent::handle($args);
         if (!common_logged_in()) {
-            common_user_error(_('Not logged in.'));
+            $this->clientError(_('Not logged in.'));
             return;
         }
 
@@ -40,28 +40,28 @@ class UnsubscribeAction extends Action
         $token = $this->trimmed('token');
 
         if (!$token || $token != common_session_token()) {
-            $this->client_error(_('There was a problem with your session token. Try again, please.'));
+            $this->clientError(_('There was a problem with your session token. Try again, please.'));
             return;
         }
 
         $other_id = $this->arg('unsubscribeto');
 
         if (!$other_id) {
-            $this->client_error(_('No profile id in request.'));
+            $this->clientError(_('No profile id in request.'));
             return;
         }
 
         $other = Profile::staticGet('id', $other_id);
 
         if (!$other_id) {
-            $this->client_error(_('No profile with that id.'));
+            $this->clientError(_('No profile with that id.'));
             return;
         }
 
         $result = subs_unsubscribe_to($user, $other);
 
         if ($result != true) {
-            common_user_error($result);
+            $this->clientError($result);
             return;
         }
 
diff --git a/actions/updateprofile.php b/actions/updateprofile.php
index abb034c81e..c79112dace 100644
--- a/actions/updateprofile.php
+++ b/actions/updateprofile.php
@@ -37,7 +37,7 @@ class UpdateprofileAction extends Action
                 print "omb_version=".OMB_VERSION_01;
             }
         } catch (OAuthException $e) {
-            $this->server_error($e->getMessage());
+            $this->serverError($e->getMessage());
             return;
         }
     }
@@ -46,14 +46,14 @@ class UpdateprofileAction extends Action
     {
         $version = $req->get_parameter('omb_version');
         if ($version != OMB_VERSION_01) {
-            $this->client_error(_('Unsupported OMB version'), 400);
+            $this->clientError(_('Unsupported OMB version'), 400);
             return false;
         }
         # First, check to see if listenee exists
         $listenee =  $req->get_parameter('omb_listenee');
         $remote = Remote_profile::staticGet('uri', $listenee);
         if (!$remote) {
-            $this->client_error(_('Profile unknown'), 404);
+            $this->clientError(_('Profile unknown'), 404);
             return false;
         }
         # Second, check to see if they should be able to post updates!
@@ -64,72 +64,72 @@ class UpdateprofileAction extends Action
         $sub->subscribed = $remote->id;
         $sub->token = $token->key;
         if (!$sub->find(true)) {
-            $this->client_error(_('You did not send us that profile'), 403);
+            $this->clientError(_('You did not send us that profile'), 403);
             return false;
         }
 
         $profile = Profile::staticGet('id', $remote->id);
         if (!$profile) {
             # This one is our fault
-            $this->server_error(_('Remote profile with no matching profile'), 500);
+            $this->serverError(_('Remote profile with no matching profile'), 500);
             return false;
         }
         $nickname = $req->get_parameter('omb_listenee_nickname');
         if ($nickname && !Validate::string($nickname, array('min_length' => 1,
                                                             'max_length' => 64,
                                                             'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
-            $this->client_error(_('Nickname must have only lowercase letters and numbers and no spaces.'));
+            $this->clientError(_('Nickname must have only lowercase letters and numbers and no spaces.'));
             return false;
         }
         $license = $req->get_parameter('omb_listenee_license');
         if ($license && !common_valid_http_url($license)) {
-            $this->client_error(sprintf(_("Invalid license URL '%s'"), $license));
+            $this->clientError(sprintf(_("Invalid license URL '%s'"), $license));
             return false;
         }
         $profile_url = $req->get_parameter('omb_listenee_profile');
         if ($profile_url && !common_valid_http_url($profile_url)) {
-            $this->client_error(sprintf(_("Invalid profile URL '%s'."), $profile_url));
+            $this->clientError(sprintf(_("Invalid profile URL '%s'."), $profile_url));
             return false;
         }
         # optional stuff
         $fullname = $req->get_parameter('omb_listenee_fullname');
         if ($fullname && strlen($fullname) > 255) {
-            $this->client_error(_("Full name is too long (max 255 chars)."));
+            $this->clientError(_("Full name is too long (max 255 chars)."));
             return false;
         }
         $homepage = $req->get_parameter('omb_listenee_homepage');
         if ($homepage && (!common_valid_http_url($homepage) || strlen($homepage) > 255)) {
-            $this->client_error(sprintf(_("Invalid homepage '%s'"), $homepage));
+            $this->clientError(sprintf(_("Invalid homepage '%s'"), $homepage));
             return false;
         }
         $bio = $req->get_parameter('omb_listenee_bio');
         if ($bio && strlen($bio) > 140) {
-            $this->client_error(_("Bio is too long (max 140 chars)."));
+            $this->clientError(_("Bio is too long (max 140 chars)."));
             return false;
         }
         $location = $req->get_parameter('omb_listenee_location');
         if ($location && strlen($location) > 255) {
-            $this->client_error(_("Location is too long (max 255 chars)."));
+            $this->clientError(_("Location is too long (max 255 chars)."));
             return false;
         }
         $avatar = $req->get_parameter('omb_listenee_avatar');
         if ($avatar) {
             if (!common_valid_http_url($avatar) || strlen($avatar) > 255) {
-                $this->client_error(sprintf(_("Invalid avatar URL '%s'"), $avatar));
+                $this->clientError(sprintf(_("Invalid avatar URL '%s'"), $avatar));
                 return false;
             }
             $size = @getimagesize($avatar);
             if (!$size) {
-                $this->client_error(sprintf(_("Can't read avatar URL '%s'"), $avatar));
+                $this->clientError(sprintf(_("Can't read avatar URL '%s'"), $avatar));
                 return false;
             }
             if ($size[0] != AVATAR_PROFILE_SIZE || $size[1] != AVATAR_PROFILE_SIZE) {
-                $this->client_error(sprintf(_("Wrong size image at '%s'"), $avatar));
+                $this->clientError(sprintf(_("Wrong size image at '%s'"), $avatar));
                 return false;
             }
             if (!in_array($size[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG,
                                           IMAGETYPE_PNG))) {
-                $this->client_error(sprintf(_("Wrong image type for '%s'"), $avatar));
+                $this->clientError(sprintf(_("Wrong image type for '%s'"), $avatar));
                 return false;
             }
         }
@@ -156,14 +156,14 @@ class UpdateprofileAction extends Action
         }
 
         if (!$profile->update($orig_profile)) {
-            $this->server_error(_('Could not save new profile info'), 500);
+            $this->serverError(_('Could not save new profile info'), 500);
             return false;
         } else {
             if ($avatar) {
                 $temp_filename = tempnam(sys_get_temp_dir(), 'listenee_avatar');
                 copy($avatar, $temp_filename);
                 if (!$profile->setOriginal($temp_filename)) {
-                    $this->server_error(_('Could not save avatar info'), 500);
+                    $this->serverError(_('Could not save avatar info'), 500);
                     return false;
                 }
             }
diff --git a/actions/userauthorization.php b/actions/userauthorization.php
index 196fae9ad4..838458932b 100644
--- a/actions/userauthorization.php
+++ b/actions/userauthorization.php
@@ -54,7 +54,7 @@ class UserauthorizationAction extends Action
                 common_debug('getting new request', __FILE__);
                 $req = $this->get_new_request();
                 if (!$req) {
-                    $this->client_error(_('No request found!'));
+                    $this->clientError(_('No request found!'));
                 }
                 common_debug('validating request', __FILE__);
                 # XXX: only validate new requests, since nonce is one-time use
@@ -64,7 +64,7 @@ class UserauthorizationAction extends Action
                 $this->show_form($req);
             } catch (OAuthException $e) {
                 $this->clear_request();
-                $this->client_error($e->getMessage());
+                $this->clientError($e->getMessage());
                 return;
             }
 
@@ -137,7 +137,7 @@ class UserauthorizationAction extends Action
         $req = $this->get_stored_request();
 
         if (!$req) {
-            common_user_error(_('No authorization request!'));
+            $this->clientError(_('No authorization request!'));
             return;
         }
 
@@ -145,10 +145,10 @@ class UserauthorizationAction extends Action
 
         if ($this->arg('accept')) {
             if (!$this->authorize_token($req)) {
-                $this->client_error(_('Error authorizing token'));
+                $this->clientError(_('Error authorizing token'));
             }
             if (!$this->save_remote_profile($req)) {
-                $this->client_error(_('Error saving remote profile'));
+                $this->clientError(_('Error saving remote profile'));
             }
             if (!$callback) {
                 $this->show_accept_message($req->get_parameter('oauth_token'));
@@ -160,7 +160,7 @@ class UserauthorizationAction extends Action
                 $profile = $user->getProfile();
                 if (!$profile) {
                     common_log_db_error($user, 'SELECT', __FILE__);
-                    $this->server_error(_('User without matching profile'));
+                    $this->serverError(_('User without matching profile'));
                     return;
                 }
                 $params['omb_listener_nickname'] = $user->nickname;
diff --git a/actions/userbyid.php b/actions/userbyid.php
index d57ed21a54..3ff2c9c410 100644
--- a/actions/userbyid.php
+++ b/actions/userbyid.php
@@ -32,11 +32,11 @@ class UserbyidAction extends Action
         parent::handle($args);
         $id = $this->trimmed('id');
         if (!$id) {
-            $this->client_error(_('No id.'));
+            $this->clientError(_('No id.'));
         }
         $user =& User::staticGet($id);
         if (!$user) {
-            $this->client_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
         }
 
         // support redirecting to FOAF rdf/xml if the agent prefers it
diff --git a/actions/userrss.php b/actions/userrss.php
index 1e9fe121f0..d14fc523e8 100644
--- a/actions/userrss.php
+++ b/actions/userrss.php
@@ -34,7 +34,7 @@ class UserrssAction extends Rss10Action
         $this->user = User::staticGet('nickname', $nickname);
 
         if (!$this->user) {
-            common_user_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
             return false;
         } else {
             return true;
@@ -78,7 +78,7 @@ class UserrssAction extends Rss10Action
         $profile = $user->getProfile();
         if (!$profile) {
             common_log_db_error($user, 'SELECT', __FILE__);
-            $this->server_error(_('User without matching profile'));
+            $this->serverError(_('User without matching profile'));
             return null;
         }
         $avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE);
diff --git a/actions/xrds.php b/actions/xrds.php
index 9c51f1dd21..7cb2cd2100 100644
--- a/actions/xrds.php
+++ b/actions/xrds.php
@@ -35,7 +35,7 @@ class XrdsAction extends Action
         $nickname = $this->trimmed('nickname');
         $user = User::staticGet('nickname', $nickname);
         if (!$user) {
-            common_user_error(_('No such user.'));
+            $this->clientError(_('No such user.'));
             return;
         }
         $this->show_xrds($user);
diff --git a/lib/action.php b/lib/action.php
index bd37a84422..33b1389054 100644
--- a/lib/action.php
+++ b/lib/action.php
@@ -528,14 +528,14 @@ class Action extends HTMLOutputter // lawsuit
         }
     }
 
-    function server_error($msg, $code=500)
+    function serverError($msg, $code=500)
     {
         $action = $this->trimmed('action');
         common_debug("Server error '$code' on '$action': $msg", __FILE__);
         common_server_error($msg, $code);
     }
 
-    function client_error($msg, $code=400)
+    function clientError($msg, $code=400)
     {
         $action = $this->trimmed('action');
         common_debug("User error '$code' on '$action': $msg", __FILE__);