diff --git a/cli b/cli
index 214139a..a023fbd 100755
--- a/cli
+++ b/cli
@@ -14,7 +14,7 @@ $app_path = __DIR__;
 
 include $app_path . '/vendor/autoload.php';
 
-\Minz\Configuration::load('dotenv', $app_path);
+\Webubbub\Configuration::load('dotenv', $app_path);
 
 $request = \Minz\Request::initFromCli($argv);
 
diff --git a/public/index.php b/public/index.php
index c4f3513..5d4b218 100644
--- a/public/index.php
+++ b/public/index.php
@@ -11,7 +11,7 @@
 
 include $app_path . '/vendor/autoload.php';
 
-\Minz\Configuration::load('dotenv', $app_path);
+\Webubbub\Configuration::load('dotenv', $app_path);
 
 try {
     $application = new \Webubbub\Application();
diff --git a/src/Configuration.php b/src/Configuration.php
new file mode 100644
index 0000000..e588015
--- /dev/null
+++ b/src/Configuration.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace Webubbub;
+
+/**
+ * @phpstan-type ConfigurationApplication array{
+ *     'allowed_topic_origins': string,
+ * }
+ *
+ * @author Marien Fressinaud <dev@marienfressinaud.fr>
+ * @license http://www.gnu.org/licenses/agpl-3.0.en.html AGPL
+ */
+class Configuration extends \Minz\Configuration
+{
+    /**
+     * @var ConfigurationApplication
+     */
+    public static array $application;
+
+    public static function isPublicHub(): bool
+    {
+        return self::$application['allowed_topic_origins'] === '';
+    }
+
+    /**
+     * @return string[]
+     */
+    public static function allowedTopicOrigins(): array
+    {
+        return array_map('trim', explode(',', self::$application['allowed_topic_origins']));
+    }
+}
diff --git a/src/controllers/Home.php b/src/controllers/Home.php
index 3bbe568..42e23ed 100644
--- a/src/controllers/Home.php
+++ b/src/controllers/Home.php
@@ -16,9 +16,8 @@ class Home
      */
     public function index(Request $request): Response
     {
-        $is_public_hub = \Minz\Configuration::$application['allowed_topic_origins'] === '';
         return Response::ok('home/index.phtml', [
-            'is_public_hub' => $is_public_hub,
+            'is_public_hub' => \Webubbub\Configuration::isPublicHub(),
         ]);
     }
 
diff --git a/src/controllers/Requests.php b/src/controllers/Requests.php
index cf33068..9e61972 100644
--- a/src/controllers/Requests.php
+++ b/src/controllers/Requests.php
@@ -187,6 +187,12 @@ public function publish(Request $request): Response
 
         $content = new models\Content($url);
 
+        if (!$content->isAllowed()) {
+            return Response::badRequest('requests/error.txt', [
+                'errors' => ["url \"{$url}\" is not authorized"],
+            ]);
+        }
+
         $errors = $content->validate();
         if ($errors) {
             return Response::badRequest('requests/error.txt', [
diff --git a/src/jobs/ProcessContents.php b/src/jobs/ProcessContents.php
index f997eae..2a6300b 100644
--- a/src/jobs/ProcessContents.php
+++ b/src/jobs/ProcessContents.php
@@ -55,6 +55,9 @@ public function performFetch(): void
                 \Minz\Log::warning(
                     "content #{$content->id}: {$http_code} HTTP code is not successful"
                 );
+
+                $content->remove();
+
                 continue;
             }
 
diff --git a/src/models/Content.php b/src/models/Content.php
index af7220d..64ec1c5 100644
--- a/src/models/Content.php
+++ b/src/models/Content.php
@@ -4,6 +4,7 @@
 
 use Minz\Database;
 use Minz\Validable;
+use Webubbub\utils;
 
 /**
  * Represent a content created by publishers, it is delivered to subscribers.
@@ -85,6 +86,14 @@ public function deliver(): void
         $this->status = 'delivered';
     }
 
+    /**
+     * Return wheter a content is allowed on the hub or not.
+     */
+    public function isAllowed(): bool
+    {
+        return utils\AllowedOriginHelper::isOriginAllowed($this->url);
+    }
+
     /**
      * Delete the Contents that can be deleted and return the number of
      * deletions.
diff --git a/src/models/Subscription.php b/src/models/Subscription.php
index d562bbc..3617018 100644
--- a/src/models/Subscription.php
+++ b/src/models/Subscription.php
@@ -4,6 +4,7 @@
 
 use Minz\Database;
 use Minz\Validable;
+use Webubbub\utils;
 
 /**
  * Represent the subscription of a subscriber (callback) to a topic.
@@ -138,26 +139,7 @@ public function __construct(
      */
     public function isAllowed(): bool
     {
-        $allowed_origins = \Minz\Configuration::$application['allowed_topic_origins'];
-        assert(is_string($allowed_origins));
-
-        if ($allowed_origins === '') {
-            // Empty value means open hub
-            return true;
-        }
-
-        $allowed_origins = explode(',', $allowed_origins);
-
-        foreach ($allowed_origins as $allowed_origin) {
-            $allowed_origin = trim($allowed_origin);
-
-            $origin_length = strlen($allowed_origin);
-            if (substr($this->topic, 0, $origin_length) === $allowed_origin) {
-                return true;
-            }
-        }
-
-        return false;
+        return utils\AllowedOriginHelper::isOriginAllowed($this->topic);
     }
 
     /**
diff --git a/src/utils/AllowedOriginHelper.php b/src/utils/AllowedOriginHelper.php
new file mode 100644
index 0000000..05a8d5b
--- /dev/null
+++ b/src/utils/AllowedOriginHelper.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Webubbub\utils;
+
+/**
+ * @author Marien Fressinaud <dev@marienfressinaud.fr>
+ * @license http://www.gnu.org/licenses/agpl-3.0.en.html AGPL
+ */
+class AllowedOriginHelper
+{
+    public static function isOriginAllowed(string $origin): bool
+    {
+        if (\Webubbub\Configuration::isPublicHub()) {
+            return true;
+        }
+
+        $allowed_topic_origins = explode(',', \Webubbub\Configuration::$application['allowed_topic_origins']);
+
+        foreach ($allowed_topic_origins as $allowed_topic_origin) {
+            $allowed_topic_origin = trim($allowed_topic_origin);
+
+            if (str_starts_with($origin, $allowed_topic_origin)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 9c7e7ba..4eb6b2d 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -6,4 +6,4 @@
 
 include $app_path . '/vendor/autoload.php';
 
-\Minz\Configuration::load('test', $app_path);
+\Webubbub\Configuration::load('test', $app_path);
diff --git a/tests/cli/RequestsTest.php b/tests/cli/RequestsTest.php
index 6da5071..508c945 100644
--- a/tests/cli/RequestsTest.php
+++ b/tests/cli/RequestsTest.php
@@ -251,6 +251,22 @@ public function testPublishWithSameUrlAndFetchedStatus(): void
         $this->assertSame(2, models\Content::count());
     }
 
+    public function testPublishFailsIfUrlIsNotAuthorized(): void
+    {
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
+
+        $response = $this->appRun('CLI', '/requests/publish', [
+            'hub_url' => 'https://not.allowed.com',
+        ]);
+
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = '';
+
+        $this->assertResponseCode($response, 400);
+        $this->assertResponseContains($response, 'url "https://not.allowed.com" is not authorized');
+        $this->assertResponseHeaders($response, ['Content-Type' => 'text/plain']);
+        $this->assertSame(0, models\Content::count());
+    }
+
     #[\PHPUnit\Framework\Attributes\DataProvider('invalidUrlProvider')]
     public function testPublishFailsIfUrlIsInvalid(string $invalid_url): void
     {
diff --git a/tests/jobs/ProcessContentsTest.php b/tests/jobs/ProcessContentsTest.php
index d7af2fe..96ae1bc 100644
--- a/tests/jobs/ProcessContentsTest.php
+++ b/tests/jobs/ProcessContentsTest.php
@@ -214,11 +214,7 @@ public function testPerformWithErrorHttpCode(): void
         $processor = new ProcessContents();
         $processor->perform();
 
-        $content = $content->reload();
-        $this->assertSame('new', $content->status);
-        $this->assertNull($content->content);
-        $this->assertNull($content->type);
-        $this->assertNull($content->links);
+        $this->assertFalse(models\Content::exists($content->id));
     }
 
     public function testPerformWithDeliveryTryAtInFuture(): void
diff --git a/tests/jobs/ProcessSubscriptionsTest.php b/tests/jobs/ProcessSubscriptionsTest.php
index 1bbdd63..09eada4 100644
--- a/tests/jobs/ProcessSubscriptionsTest.php
+++ b/tests/jobs/ProcessSubscriptionsTest.php
@@ -45,7 +45,7 @@ public function testPerform(): void
 
     public function testPerformWithAllowedTopic(): void
     {
-        \Minz\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
         $subscription = SubscriptionFactory::create([
             'status' => 'new',
             'pending_request' => 'subscribe',
@@ -58,12 +58,12 @@ public function testPerformWithAllowedTopic(): void
         $subscription = $subscription->reload();
         $this->assertSame('verified', $subscription->status);
 
-        \Minz\Configuration::$application['allowed_topic_origins'] = '';
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = '';
     }
 
     public function testPerformWithNotAllowedTopic(): void
     {
-        \Minz\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
         $subscription = SubscriptionFactory::create([
             'status' => 'new',
             'pending_request' => 'subscribe',
@@ -75,13 +75,13 @@ public function testPerformWithNotAllowedTopic(): void
 
         $this->assertFalse(models\Subscription::exists($subscription->id));
 
-        \Minz\Configuration::$application['allowed_topic_origins'] = '';
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = '';
     }
 
     #[\PHPUnit\Framework\Attributes\DataProvider('failingHttpCodeProvider')]
     public function testPerformWithNotAllowedTopicAndRecentSubscriptionAndFailingResponse(int $http_code): void
     {
-        \Minz\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
         $subscription = SubscriptionFactory::create([
             'status' => 'new',
             'pending_request' => 'subscribe',
@@ -96,13 +96,13 @@ public function testPerformWithNotAllowedTopicAndRecentSubscriptionAndFailingRes
         $subscription = $subscription->reload();
         $this->assertSame('new', $subscription->status);
 
-        \Minz\Configuration::$application['allowed_topic_origins'] = '';
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = '';
     }
 
     #[\PHPUnit\Framework\Attributes\DataProvider('failingHttpCodeProvider')]
     public function testPerformWithNotAllowedTopicAndOldSubscriptionAndFailingResponse(int $http_code): void
     {
-        \Minz\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = 'https://allowed.1.com,https://allowed.2.com';
         $subscription = SubscriptionFactory::create([
             'status' => 'new',
             'pending_request' => 'subscribe',
@@ -116,7 +116,7 @@ public function testPerformWithNotAllowedTopicAndOldSubscriptionAndFailingRespon
 
         $this->assertFalse(models\Subscription::exists($subscription->id));
 
-        \Minz\Configuration::$application['allowed_topic_origins'] = '';
+        \Webubbub\Configuration::$application['allowed_topic_origins'] = '';
     }
 
     public function testPerformWithSubscribePendingRequest(): void