Internal Server Error on PHP requests > 29 seconds

[designosis]

Running MAMP PRO 6.6.4 (build 34077) on macOS 12.6.2, I use PHP 8.1.11 with the stock php.ini, with a single INI setting adjusted:

Code: Select all

max_execution_time = 60

However this simple PHP code ...

Code: Select all

<?php
    sleep(30);
    echo 'SUCCESS';

... shows the ugly white "500 Internal Server Error". If you change `sleep()` in the code above to 29, it works fine. However any sleep value ≥ 30 causes an Internal Server Error.

Notes:

• There are no errors in `apache_error.log` or `php_error.log`.
• PHP's `ini_get('max_execution_time')` shows 60, so it's being set correctly.
• I see an Apache module "reqtimeout_module" is active, but don't understand how I'd go about seeing or changing its settings. Disabling this module has no effect.
• This error happens with all version of PHP. I've tried 5.6.40, 7.1.33, 7.4.21, and older 8.1 versions, each time only changing `max_execution_time = 60` in the INI.

From the CLI, running this code with `sleep(30)` or higher works as expected (no errors). The code (and the max_execution_time directive) works as expected on other servers.

Any advice on how to get MAMP working when a process takes ≥30 seconds?