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I am accessing a PHP server using REST: all data is passed in a GET request as URL parameters. One of the parameters arrives at the server in the query_string, but it is not in the _GET global. But shortening the parameter (the cutoff seems to be around 512 characters) lets it through.
Assuming I have diagnosed the problem correctly, is there a way to change this maximum size? I have not found any explanation in the documentation, not even a mention of this limit. This is on Debian squeeze / Apache 2.2.16 / PHP 5.3.3.
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The official documentation specifies a maximum length of 2048 characters for the <loc> element, which is used to submit URLs: URL of the page. This URL must begin with the protocol (e.g. “http”) and end with a trailing slash if required by the web server. This value must not exceed 2,048 characters.
In short. According to the HTTP spec, there is no limit to a URL's length. Keep your URLs under 2048 characters; this will ensure the URLs work in all clients & server configurations. Also, search engines like URLs to remain under approximately 2000 characters.
Chrome limits URLs to a maximum length of 2MB for practical reasons and to avoid causing denial-of-service problems in inter-process communication. On most platforms, Chrome's omnibox limits URL display to 32kB ( kMaxURLDisplayChars ) although a 1kB limit is used on VR platforms.
The default value of the HTTP and HTTPS connector maximum post size is 2MB. However you can adjust the value as per your requirement. The below command to set the connector to accept maximum 100,000 bytes. If the http request POST size exceeds the 100,000 bytes then connector return HTTP/1.1 400 Bad Request.
Ok, it seems that some versions of PHP have a limitation of length of GET params:
Please note that PHP setups with the suhosin patch installed will have a default limit of 512 characters for get parameters. Although bad practice, most browsers (including IE) supports URLs up to around 2000 characters, while Apache has a default of 8000.
To add support for long parameters with suhosin, add
suhosin.get.max_value_length = <limit>inphp.ini
Source: http://www.php.net/manual/en/reserved.variables.get.php#101469
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