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"Via" field in HTTP Request sent to a web server by Security Gateway in Non Transparent proxy mode contains incomplete HTTP version
Symptoms
  • Some web servers are not reachable through Security Gateway in Non Transparent proxy mode.

  • Traffic capture on Security Gateway shows that "Via" field in HTTP Request sent to a web server by Security Gateway in Non Transparent proxy mode contains incomplete HTTP version - only major version (e.g., only "1" instead of "1.0" / "1.1").

    Example from WireShark:

    Frame 7: 583 bytes on wire (4664 bits), 583 bytes captured (4664 bits)
    Internet Protocol Version 4, Src: 192.168.10.22 (192.168.10.22), Dst: 172.30.16.24 (172.30.16.24)
    Transmission Control Protocol, Src Port: 10667 (10667), Dst Port: 80 (80), Seq: 3218348548, Ack: 1485482165, Len: 517
    Hypertext Transfer Protocol
        GET /test.aspx?no=12345 HTTP/1.1\r\n
        Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, */*\r\n
        Accept-Language: en-US\r\n
        User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; ...)\r\n
        Accept-Encoding: gzip, deflate\r\n
        Proxy-Connection: Keep-Alive\r\n
        Host: online.textiles.org.tw\r\n
        Via: 1 192.168.10.22\r\n
        \r\n
    
Solution
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