I get 500 errors. How do I debug?

Look in the log.

Be aware that by default error log is disabled when a space is in production mode.

The reason for this default behavior is to avoid unnecessary resource usage caused by sustained error logging.

Set log_errors to On in Space -> Services -> PHP and errors will begin to emerge in Space -> Log.

Setting web applications in maintenance mode might cause a 5xx error. Remember to disable maintenance mode again.