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Asked: 2026-05-11T03:14:23+00:00

I have an application that has to deal with getting special characters in its

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I have an application that has to deal with getting ‘special’ characters in its URL (like &, +, %, etc). When I’m sending a request to the application using these characters (of course I’m sending them escaped) I’m getting ‘Bad Request’ response code with the message ‘ASP.NET detected invalid characters in the URL’. Tracing the request shown me that the error was thrown from the ‘Authentication Module’.

I’ve searched a bit and found that every page has a ValidateRequest and changing its value to false solves the problem. Unfortunately I’m using Httphandler. Does anyone know how to stop the request validation using http handler?

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  1. I ran into the same problem (creating an IHttpHandler that needed to receive requests with special characters in the URL). I had to do two things to fix it:

    1. Create the following DWORD registration entry with a value of 1: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ASP.NET\VerificationCompatibility

    2. In the web.config, set the allowDoubleEscaping attribute of the requestFiltering element to true.

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