How to Handle 'Potentially Dangerous Request.Path Value' Errors in ASP.NET?

Managing Risky Request.Path Values from Client-Side Input

The error "A potentially dangerous Request.Path value was detected from the client (*)" frequently arises from restricted characters within client-submitted URLs. This guide outlines several effective strategies to mitigate this security risk.

One approach involves adjusting the web.config file to permit specific special characters. For .NET 4.0 and later versions, modify the web.config as follows:

<code class="language-xml"><system.web>
  <httpRuntime requestPathInvalidCharacters="<,>,%,&amp;,:,\,?"></httpRuntime>
</system.web></code>

This allows all characters except the asterisk (*), a common default restriction that can interfere with wildcard searches or dynamic URL structures.

Alternatively, you can manually encode and decode special characters using HttpServerUtility.UrlEncode() and HttpServerUtility.UrlDecode(). While functional, this method is more labor-intensive and demands meticulous coding.

For applications prioritizing clean URLs without query strings, ASP.NET routing offers a superior solution. Routing maps URLs to controllers and actions, automatically managing the encoding and decoding of URL segments, thus avoiding the need for manual intervention and enhancing URL clarity.

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