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copied!<p>If you want to allow the request through, you need to add <code>requestPathInvalidCharacters</code> and set it to an empty string:</p> <pre><code><system.web> <httpRuntime requestPathInvalidCharacters="" /> </system.web> </code></pre> <p><strong>Edit</strong> You should leave your original question in place, because now my answer does not make sense.</p> <p>But in answer to your second question, that it's because %3f corresponds to '?' which is not allowed in file names on Windows. You can set the <code>relaxedUrlToFileSystemMapping</code> property to <code>true</code> to change this behaviour:</p> <pre><code><system.web> <httpRuntime requestPathInvalidCharacters="" relaxedUrlToFileSystemMapping="true" /> </system.web> </code></pre> <p>You might want to look through all of the properties in the <a href="http://msdn.microsoft.com/en-us/library/system.web.configuration.httpruntimesection_properties%28v=VS.100%29.aspx" rel="noreferrer">HttpRuntimeSection</a> class to see if there's any others that might apply.</p> <p>You can also implement a sub class of <a href="http://msdn.microsoft.com/en-us/library/system.web.util.requestvalidator.aspx" rel="noreferrer">RequestValidator</a> and set up your web.config to use your subclass (that will presumably allow all URLs through?). Personally, I wouldn't bother and just let the built-in classes handle it. It's unlikely that a normal user is every going to <em>accidentally</em> type in "%3f" in a path, and why bother going to so much trouble to improve the use-case for malicious users?</p> <p>This, by the way, is actually a new feature in ASP.NET 4, which is why Stack Overflow doesn't spit out an error: it's running on .NET 3.5.</p>

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