How to Fix 'A Potentially Dangerous Request.Path Value Was Detected' Errors in .NET?

Solving the ".NET 4.0 'Potentially Dangerous Request.Path' Error for URLs with Special Characters

Web developers often encounter the frustrating "A potentially dangerous Request.Path value was detected from the client (*)." error. This typically occurs when a URL contains special characters, like the asterisk.

The solution for .NET 4.0 applications involves a simple adjustment to your web.config file:

<system.web>
  <httpruntime requestPathInvalidCharacters="<,>%,&amp;,:,\,?"></httpruntime>
</system.web>

Removing the asterisk from the requestPathInvalidCharacters attribute permits URLs with special characters.

For older .NET versions, manual encoding/decoding using HttpUtility.UrlEncode() and HttpUtility.UrlDecode() might be necessary. Using query strings is another alternative, although it may not always be the ideal approach.

In short, modifying your web.config as shown above effectively resolves the "potentially dangerous Request.Path" error for URLs containing special characters, ensuring smooth operation of your web application.

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