Nginx suddenly reports a 504 gateway timeout error. When using PHP to perform a large number of database queries, it occasionally reports a 504 gateway timeout error. Don't be afraid of encountering a 504 gateway timeout. Only individual operations will cause a 504 gateway timeout. Refresh the timeout page, or continue to connect to the database, but it's more troublesome. Let's take a look at how to solve the Nginx 504 gateway timeout problem.