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Asked: 2026-05-31T07:02:07+00:00

I’m trying to send POST data that is 2 million characters big (non-binary string)

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I’m trying to send POST data that is 2 million characters big (non-binary string) via ajax (jQuery) and it always comes up as blank on the PHP side. Here is my code:

var string = "<data string that is 2M chars long>";
$.ajax({
    cache: false,
    type: 'POST',
    url: 'data.php',
    data: {'data_string': string}
});

On the PHP side, I get the following error message (when trying to retrieve data from $_POST['data_string']):

Notice: Undefined index: data_string in data.php on line ...

I’ve checked the post_max_size in php.ini, and it’s set at 256M which should be more than enough? I’m stumped and not sure what I’m doing wrong…

EDIT: If I make "string" a small amount of data (e.g. var string = 'test') then $_POST["data_string"] returns test, as expected. So I’m wondering if there’s some sort of data limit I’m reaching in Apache2, PHP or the browser itself? I’m using Google Chrome 17.0.963.79

EDIT2: memory_limit = 256M in php.ini

EDIT3: max_input_time = -1 in php.ini

EDIT4: var_dump($_POST) returns Array(0)

EDIT5: running the latest stable version of PHP5 on debian squeeze: PHP 5.3.3-7+squeeze8 with Suhosin-Patch (cli) (built: Feb 10 2012 14:12:26)

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1 Answer

  1. Editorial Team

    You’ll have to check the limits parameters on all items between you and the server. Quite hard for proxy servers if any, but at least you can check:

    Apache:

    • LimitRequestBody, around 2Gb by default, maybe greater for 64bits, check error logs for details.

    PHP:

    If you have reached the compiled in limit for Apache your only solution is to avoid direct POSt of such a big chunk of data, you’ll have to break it into pieces.

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