netcat for SSH connection through HTTP giving error: nc: Proxy error: "HTTP/1.1 200 Connection established"

Solution Verified - Updated -

Issue

  • By running the following command:
nc -x our_proxy_ip:our_proxy_port -X connect example.com 22
* It returns 
nc: Proxy error: "HTTP/1.1 200 Connection established"
* Expected result
SSH-2.0-OpenSSH_4.3

Environment

  • Red Hat Enterprise Linux 5/6
  • Using HTTP/1.1 proxy servers

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