HttpWebRequest =ResponseHeader Detail=CR

The server submitted a protocol conflict.   Section=ResponseHeader   Detail=CR   must be followed by   LF  

The   server   committed   a   protocol   violation.   Section=ResponseHeader   Detail=CR   must   be   followed   by   LF

Principal means that Microsoft does not tolerate server responses that do not comply with the httpHeader requirement in RFC   822 that httpHeader must end with CRLF.

One solution is to add
to the application.config or web.config files
    < system.net >

        < settings >

            < httpWebRequest   useUnsafeHeaderParsing="true"   / >

        < /settings >

    < /system.net >

Allow the system to tolerate (tolerant) only hearder information
ending in CR or LF