How to Handle 'Potentially Dangerous Request.Path Value' Errors Caused by Special Characters in URLs?

Addressing the "Potentially Dangerous Request.Path Value" Error with Special Characters in URLs

The error message "A potentially dangerous Request.Path value was detected from the client" signals the presence of disallowed special characters within the incoming URL. This often happens when using special characters in search queries or filters. For instance: "https://www.php.cn/link/bb83b72bf545e376f3ff9443bda39421."

A straightforward solution involves adjusting your web.config file. In .NET 4.0 and later, add or modify the following configuration to specify allowed characters:

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

Observe that the asterisk (*) is excluded from the default disallowed characters, thus resolving the error.

While manually encoding and decoding special characters is an alternative, it's less efficient and more prone to mistakes compared to the web.config approach.

For a more robust solution, consider migrating to a more sophisticated routing mechanism capable of natively handling special characters. This might involve extra configuration steps or custom coding.

Remember: Enabling special characters in URLs introduces security vulnerabilities. Always implement thorough input validation and sanitization to mitigate potential attacks.

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