diff --git a/mod/fetch.php b/mod/fetch.php
index 9336c14047..5dcedb1aaf 100644
--- a/mod/fetch.php
+++ b/mod/fetch.php
@@ -18,8 +18,7 @@ function fetch_init(App $a)
 {
 
 	if (($a->argc != 3) || (!in_array($a->argv[1], ["post", "status_message", "reshare"]))) {
-		header($_SERVER["SERVER_PROTOCOL"].' 404 '.L10n::t('Not Found'));
-		killme();
+		System::httpExit(404);
 	}
 
 	$guid = $a->argv[2];
@@ -45,15 +44,13 @@ function fetch_init(App $a)
 			}
 		}
 
-		header($_SERVER["SERVER_PROTOCOL"].' 404 '.L10n::t('Not Found'));
-		killme();
+		System::httpExit(404);
 	}
 
 	// Fetch some data from the author (We could combine both queries - but I think this is more readable)
 	$user = User::getOwnerDataById($item["uid"]);
 	if (!$user) {
-		header($_SERVER["SERVER_PROTOCOL"].' 404 '.L10n::t('Not Found'));
-		killme();
+		System::httpExit(404);
 	}
 
 	$status = Diaspora::buildStatus($item, $user);
diff --git a/mod/pubsub.php b/mod/pubsub.php
index f0a8d463c4..cd2f21dd67 100644
--- a/mod/pubsub.php
+++ b/mod/pubsub.php
@@ -7,6 +7,7 @@ use Friendica\Database\DBA;
 use Friendica\Model\Contact;
 use Friendica\Protocol\OStatus;
 use Friendica\Util\Strings;
+use Friendica\Core\System;
 
 require_once 'include/items.php';
 
@@ -16,7 +17,7 @@ function hub_return($valid, $body)
 		header($_SERVER["SERVER_PROTOCOL"] . ' 200 OK');
 		echo $body;
 	} else {
-		header($_SERVER["SERVER_PROTOCOL"] . ' 404 Not Found');
+		System::httpExit(404);
 	}
 	killme();
 }
@@ -25,8 +26,7 @@ function hub_return($valid, $body)
 
 function hub_post_return()
 {
-	header($_SERVER["SERVER_PROTOCOL"] . ' 200 OK');
-	killme();
+	System::httpExit(200);
 }
 
 function pubsub_init(App $a)
diff --git a/src/Core/System.php b/src/Core/System.php
index d24581e996..eadbf98d26 100644
--- a/src/Core/System.php
+++ b/src/Core/System.php
@@ -126,9 +126,33 @@ class System extends BaseObject
 	{
 		$err = '';
 		if ($val >= 400) {
-			$err = 'Error';
-			if (!isset($description["title"])) {
-				$description["title"] = $err." ".$val;
+			if (!empty($description['title'])) {
+				$err = $description['title'];
+			} else {
+				$title = [
+					'400' => L10n::t('Error 400 - Bad Request'),
+					'401' => L10n::t('Error 401 - Unauthorized'),
+					'403' => L10n::t('Error 403 - Forbidden'),
+					'404' => L10n::t('Error 404 - Not Found'),
+					'500' => L10n::t('Error 500 - Internal Server Error'),
+					'503' => L10n::t('Error 503 - Service Unavailable'),
+					];
+				$err = defaults($title, $val, 'Error ' . $val);
+				$description['title'] = $err;
+			}
+			if (empty($description['description'])) {
+				// Explanations are taken from https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
+				$explanation = [
+					'400' => L10n::t('The server cannot or will not process the request due to an apparent client error.'),
+					'401' => L10n::t('Authentication is required and has failed or has not yet been provided.'),
+					'403' => L10n::t('The request was valid, but the server is refusing action. The user might not have the necessary permissions for a resource, or may need an account.'),
+					'404' => L10n::t('The requested resource could not be found but may be available in the future.'),
+					'500' => L10n::t('An unexpected condition was encountered and no more specific message is suitable.'),
+					'503' => L10n::t('The server is currently unavailable (because it is overloaded or down for maintenance). Please try again later.'),
+					];
+				if (!empty($explanation[$val])) {
+					$description['description'] = $explanation[$val];
+				}
 			}
 		}