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I want to use the Request Filtering feature in IIS 7.5 to filter out some malevolent requests we are getting from some bots. The requests are triggering "System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client" and I don't want to make a case in our application configuration for it. But adding rules to deny these requests in the Request Filtering feature don't do anything because apparently request validation happens first. Any idea on how to filter these bad requests using IIS before validation happens?

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