WCF GET URL Length Limit Issue: Bad Request - Invalid URL

Question

I tried to access a WCF Service through jQuery AJAX call with GET method. So, sometimes the URL is lengthy with parameters.

When the parameters becomes so lengthy, jQ

Answer 1

Adding another answer just for completeness. In my case I had all the right values in web.config:

    
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However, I was still getting the 400 error on one of the IIS servers. After more investigation and configuration comparison it turned out that the UrlScan IIS module was the culprit. By uninstalling the module or editing the UrlScan.ini file to modify max length values the issue has been resolved:

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[RequestLimits]
MaxAllowedContentLength=104857600
MaxUrl=3000
MaxQueryString=3000