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I am getting the following error when I use the w3c markup validator and using the given format to validate html. Format: string sValidateUrl = "http://validator.w3.org/check"; string sData = "output=soap12&fragment=" + HttpUtility.UrlEncode(HTMLString); Error: The remote server returned an error: (502) Bad Gateway. Error detail: Bad Gateway The proxy server received an invalid response from an upstream server Apache/2 Server at validator.w3.org Port 80
Use https://validator.w3.org/nu/ instead.