I see you followed instructions provided in this GitHub link[1]. From the details provided in your Custom nginx config file, I do not see any mis-configuration. Can you however, confirm that this file was added to the project root directory[2]? I also wonder if index.php is used as the framework front controller or your project uses something different.
[1]https://github.com/GoogleCloudPlatform/php-docker/blob/master/php-onbuild/README.md#how-to-change-nginxconfig [2]https://cloud.google.com/appengine/docs/flexible/php/runtime#customizing_nginx -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/4c098303-9507-49d2-8418-5c96bd3e1bf7%40googlegroups.com.
