Howto allow “Illegal characters in path”?

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Scott Hanselman posted a good summary on allowing illegal characters in the path.

If you really want to allow characters that are restricted, remove them from the list by editing your web.config (this will probably only work in .NET 4 and on IIS7):

<system.web>
    <httpRuntime requestValidationMode="2.0" relaxedUrlToFileSystemMapping="true" requestPathInvalidCharacters="&lt;,&gt;,*,%,:,&amp;,\" />
</system.web>

You may also need to do as hbruce suggests:

<system.webServer>
    <security>
        <requestFiltering allowDoubleEscaping="true"/>
    </security>
</system.webServer>

There are still some certain paths that will not work, (such as /search/% ) as you will get the 400 “Bad Request – Invalid URL” message. The only workaround I’ve found is to use that part as a querystring: /search?q=% with the above steps.

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