Why does php cause a 504 error?

The reasons for the 504 error in php are: 1. The default fastcgi process response buffer of nginx is too small; 2. There is a problem with the configuration of the php environment; 3. The default static processing method of php-fpm makes php -The cgi process occupies memory for a long time and cannot be released.

There are many reasons for 504 errors, as follows:

1. The default fastcgi process response buffer of nginx is too small;

This situation causes the fastcgi process to be suspended. If the fastcgi service team does not handle the suspension well, it may prompt a "504 Gateway Time-out" error.

2. There is a problem with the configuration of the PHP environment;

Sometimes the website needs to modify the configuration of php-fpm and nginx. Because in this case, the "504 Gateway Time-out" error message will also appear.

At this time, the meaning of Nginx 504 Gateway Time-out is that the requested gateway has not been requested. Simply put, it means that the executable PHP-CGI has not been requested.

3. The default static processing method of php-fpm causes the php-cgi process to occupy memory for a long time and cannot be released;

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