What potential pitfalls should be considered when sending a POST request to a Microsoft IIS 5.0 server using PHP?

When sending a POST request to a Microsoft IIS 5.0 server using PHP, one potential pitfall to consider is that IIS 5.0 may have limitations on the size of the POST data it can handle. To address this issue, you can adjust the `post_max_size` directive in the php.ini file to increase the maximum size of POST data that PHP can handle.

// Adjust the post_max_size directive in php.ini to increase the maximum size of POST data
ini_set('post_max_size', '20M');