Error 500 when waiting for a long time, how to fix?

Question

PHP

Hello.
I have a long polling (POST) request in my script, after 90 seconds of the script's operation, "500 - Internal Server Error" is returned.
Presumably due to the long script operation, but the fact is that everywhere, including php.ini, it is written:
max_execution_time = 300
max_input_time = 300
Any ideas where else there could be a limitation?
There are no php.ini calls and restrictions in php files, just like in .htaccess

Answer 1

You can find where the time limit is as follows:
1. print php_info() to the web, or php5-fpm -i to the console.
2. Find all the restrictions for 90 seconds in the options - there can be a lot of restrictions (for example, session life_time, suddenly, but it can lead to this if it is small)
3. Try to change one at a time and find out what's wrong by trial and error.
Most likely it's not about 90 seconds in php. You need to look at the nginx/apache/php error log and see the obvious error that has occurred. It can be anything, but judging by the fact that "500 - internal server error" I smell that Apache has some kind of limits / errors.