Block URLs with specific characters

Is there a way to configure proxies to prevent requests to web servers with specific characters in the URL request? We have 1 older server that has files with 8.3 naming that could be susceptible to IIS tilde enumeration and right now we can't recreate the directory after disabling 8.3 filenames, so I'm looking to prevent any requests to the server that contain a tilde. There are other methods to do this, but I'd like to stop the requests before they get to the server.



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