Why is my AJAX POST data exceeding 2 million characters arriving empty on the PHP side?

PHP/Apache/AJAX POST Limit

When attempting to send POST data exceeding 2 million characters via AJAX in jQuery, you may encounter an issue where the data is received as blank on the PHP side. This is often due to limitations in various components of the system.

Apache

Apache has a parameter called LimitRequestBody, which by default is set to around 2GB. If the POST size exceeds this limit, Apache will reject the request, and no data will be received on the PHP side. Check your Apache error logs for more specific details.

PHP

PHP has several parameters that can affect POST data handling:

• post_max_size: This directly determines the maximum size of POST data that PHP can accept. Set this value to an appropriate amount, ensuring it's larger than the data you intend to post.
• upload_max_filesize: While possibly unrelated, some users have reported success by increasing this value.
• max_input_time: If the POST request takes too long to complete, this parameter can cause issues. Set it to a suitable value, or set it to -1 to disable any timeout.
• max_execution_time: While unlikely to be the culprit, it's worth ensuring this value is high enough to process the large POST request.
• memory_limit: If the POST data exceeds the memory limit for the PHP process, it can cause problems. Adjust this value as needed.

Other Considerations

• Check for limitations in any proxy servers or load balancers in front of your server.
• Consider breaking up the large POST data into smaller chunks if the size exceeds the limits of the system.

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