URL query string length limitations

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HTTP states there is no limit to the length of a query string, but it indicates the host name is limited to 255 characters because of DNS limitations.

 While the specifications do not specify any maximum length, practical limits are imposed by web browser and server software. 

 Internet Explorer (Browser)
Microsoft states that the maximum length of a URL in Internet Explorer is 2,083 characters, with no more than 2,048 characters in the path portion of the URL. Attempts to use URLs longer than this produced a clear error message in Internet Explorer.

 Edge (Browser)
The limit appears to be around 81578 characters. 

 Chrome
It stops displaying the URL after 64k characters, but can serve more than 100k characters. No further testing was done beyond that.

 Firefox 
After 65,536 characters, the location bar no longer displays the URL in Windows Firefox 1.5.x. However, longer URLs will work. No further testing was done after 100,000 characters.

 Safari
At least 80,000 characters will work. Testing was not tried beyond that.

 Opera
At least 190,000 characters will work. Stopped testing after 190,000 characters. Opera 9 for Windows continued to display a fully editable, copyable and pasteable URL in the location bar even at 190,000 characters.

 Apache
Early attempts to measure the maximum URL length in web browsers bumped into a server URL length limit of approximately 4,000 characters, after which Apache produces a "413 Entity Too Large" error. The current up to date Apache build found in Red Hat Enterprise Linux 4 was used. The official Apache documentation only mentions an 8,192-byte limit on an individual field in a request.

 IIS Server
The default limit is 16,384 characters (yes, Microsoft's web server accepts longer URLs than Microsoft's web browser). 


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