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The length of the response header includes the response status line and any extra control characters that are received as part of HTTP protocol. A value of -1 means no limit is imposed on the response headers; a value of 0 means that all requests fail.
If the HttpWebRequest.MaximumResponseHeadersLength property is not explicitly set, it defaults to the value of the HttpWebRequest.DefaultMaximumResponseHeadersLength property.
If the length of the response header received exceeds the value of the HttpWebRequest.MaximumResponseHeadersLength property, the HttpWebRequest.EndGetResponse(IAsyncResult) or HttpWebRequest.GetResponse methods will throw a System.Net.WebException with the WebException.Status property set to WebExceptionStatus.MessageLengthLimitExceeded.