diff --git a/src/Config.php b/src/Config.php
index 4370d15..c1183eb 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -51,6 +51,18 @@ public static function getHandler($handler): string
                 ));
             }
 
+            // When the application is running behind a proxy and the TrustedProxy middleware has not been set up yet,
+            // an error like [HttpRequest.url must start with 'https'] could be thrown. Since the handler URL must
+            // always be https, we will provide a little extra information on how to fix this.
+            if ($parse['scheme'] !== 'https') {
+                throw new Exception(sprintf(
+                    'Unable to push task to Cloud Tasks because the hander URL is not https. Google Cloud Tasks ' .
+                    'will only call safe (https) URLs. If you are running Laravel behind a proxy (e.g. Ngrok, Expose), make sure it is ' .
+                    'as a trusted proxy. To quickly fix this, add the following to the [app/Http/Middleware/TrustProxies] middleware: ' .
+                    'protected $proxies = \'*\';'
+                ));
+            }
+
             // Versions 1.x and 2.x required the full path (e.g. my-app.com/handle-task). In 3.x and beyond
             // it is no longer necessary to also include the path and simply setting the handler
             // URL is enough. If someone upgrades and forgets we will warn them here.
diff --git a/tests/QueueTest.php b/tests/QueueTest.php
index 4a019b9..29a891d 100644
--- a/tests/QueueTest.php
+++ b/tests/QueueTest.php
@@ -42,7 +42,7 @@ public function a_http_request_with_the_handler_url_is_made()
 
         // Assert
         CloudTasksApi::assertTaskCreated(function (Task $task): bool {
-            return $task->getHttpRequest()->getUrl() === 'http://docker.for.mac.localhost:8080/handle-task';
+            return $task->getHttpRequest()->getUrl() === 'https://docker.for.mac.localhost:8080/handle-task';
         });
     }
 
@@ -69,7 +69,7 @@ public function it_posts_to_the_handler()
     public function it_posts_to_the_correct_handler_url()
     {
         // Arrange
-        $this->setConfigValue('handler', 'http://docker.for.mac.localhost:8081');
+        $this->setConfigValue('handler', 'https://docker.for.mac.localhost:8081');
         CloudTasksApi::fake();
 
         // Act
@@ -77,7 +77,7 @@ public function it_posts_to_the_correct_handler_url()
 
         // Assert
         CloudTasksApi::assertTaskCreated(function (Task $task): bool {
-            return $task->getHttpRequest()->getUrl() === 'http://docker.for.mac.localhost:8081/handle-task';
+            return $task->getHttpRequest()->getUrl() === 'https://docker.for.mac.localhost:8081/handle-task';
         });
     }
 
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 9110869..0d994be 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -101,7 +101,7 @@ protected function getEnvironmentSetUp($app)
             'queue' => 'barbequeue',
             'project' => 'my-test-project',
             'location' => 'europe-west6',
-            'handler' => env('CLOUD_TASKS_HANDLER', 'http://docker.for.mac.localhost:8080'),
+            'handler' => env('CLOUD_TASKS_HANDLER', 'https://docker.for.mac.localhost:8080'),
             'service_account_email' => 'info@stackkit.io',
         ]);
         $app['config']->set('queue.failed.driver', 'database-uuids');
@@ -216,7 +216,7 @@ protected function addIdTokenToHeader(?Closure $closure = null): void
     {
         $base = [
             'iss' => 'https://accounts.google.com',
-            'aud' => 'http://docker.for.mac.localhost:8080',
+            'aud' => 'https://docker.for.mac.localhost:8080',
             'exp' => time() + 10,
         ];