diff --git a/config/swagger-ui.php b/config/swagger-ui.php
index 60ca75e..acbe26b 100644
--- a/config/swagger-ui.php
+++ b/config/swagger-ui.php
@@ -45,6 +45,11 @@
              */
             'modify_file' => true,
 
+            /*
+             * The server URL configuration for the swagger file.
+             */
+            'server_url' => env('APP_URL'),
+
             /*
              * The oauth configuration for the swagger file.
              */
diff --git a/src/Http/Controllers/OpenApiJsonController.php b/src/Http/Controllers/OpenApiJsonController.php
index 5f68229..0dbdddc 100644
--- a/src/Http/Controllers/OpenApiJsonController.php
+++ b/src/Http/Controllers/OpenApiJsonController.php
@@ -57,7 +57,7 @@ protected function configureServer(array $file, array $json) : array
         }
 
         $json['servers'] = [
-            ['url' => config('app.url')],
+            ['url' => $file['server_url'] ?? config('app.url')],
         ];
 
         return $json;
diff --git a/tests/OpenApiRouteTest.php b/tests/OpenApiRouteTest.php
index 7e45ee3..62ef8ae 100644
--- a/tests/OpenApiRouteTest.php
+++ b/tests/OpenApiRouteTest.php
@@ -39,6 +39,7 @@ public function it_sets_server_to_current_app_url_if_modify_file_is_enabled($ope
     {
         config()->set('swagger-ui.files.0.versions', ['v1' => $openApiFile]);
         config()->set('swagger-ui.files.0.modify_file', true);
+        config()->set('swagger-ui.files.0.server_url', null);
         config()->set('app.url', 'http://foo.bar');
 
         $this->get('swagger/v1')
@@ -47,6 +48,24 @@ public function it_sets_server_to_current_app_url_if_modify_file_is_enabled($ope
             ->assertJsonPath('servers.0.url', 'http://foo.bar');
     }
 
+    /**
+     * @test
+     *
+     * @dataProvider openApiFileProvider
+     */
+    public function it_uses_a_custom_server_url_if_defined_in_config($openApiFile)
+    {
+        config()->set('app.url', 'http://foo.bar');
+        config()->set('swagger-ui.files.0.versions', ['v1' => $openApiFile]);
+        config()->set('swagger-ui.files.0.modify_file', true);
+        config()->set('swagger-ui.files.0.server_url', 'http://foo.bar/api');
+
+        $this->get('swagger/v1')
+            ->assertStatus(200)
+            ->assertJsonCount(1, 'servers')
+            ->assertJsonPath('servers.0.url', 'http://foo.bar/api');
+    }
+
     /**
      * @test
      *