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I'm using HTTP requests in my program to pass data via a querystring to a web-based status page. The requests are of the form:

http://www.example.com/poststatus.asp?ID="FRED"&widgetscompleted=1234&...parameterN=valueN

The ASP page parses the querystring and updates a database.

My question is: what is the sensible length limit of the querystring? I've seen mention of 2000-odd bytes but that seems to be browser-related and there is no browser involved here - just my app (using Indy) and IIS.

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    possible duplicate of What is the maximum possible length of a query string? Commented Oct 4, 2011 at 23:52
  • Thanks @James. Indeed that one answers the question: Microsoft Internet Information Server (Server) The default limit is 16,384 characters (yes, Microsoft's web server accepts longer URLs than Microsoft's web browser). This is configurable. That answer wasn't thrown up as a candidate when I entered the question. Commented Oct 4, 2011 at 23:59

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Browser dependent, for more this might help

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With the limitation on characters, what i usually do is minimize the querystring values from your example: &widgetscompleted= could be abreviated to &wc=.

I am certain if you minimize these, the length shouldn't be an issue.

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