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      1 Long: http2-prior-knowledge
      2 Tags: Versions
      3 Protocols: HTTP
      4 Added: 7.49.0
      5 Mutexed: http1.1 http1.0 http2
      6 Requires: HTTP/2
      7 Help: Use HTTP 2 without HTTP/1.1 Upgrade
      8 ---
      9 Tells curl to issue its non-TLS HTTP requests using HTTP/2 without HTTP/1.1
     10 Upgrade. It requires prior knowledge that the server supports HTTP/2 straight
     11 away. HTTPS requests will still do HTTP/2 the standard way with negotiated
     12 protocol version in the TLS handshake.
     13