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HTTP2 with libcurl

 Spec: http://tools.ietf.org/html/draft-ietf-httpbis-http2-06

 Over an http:// URL

  If CURLOPT_HTTP_VERSION is set to CURL_HTTP_VERSION_2, libcurl will include
  an upgrade header in the initial request to the host to allow upgrading to
  http2. Possibly introduce an option that will cause libcurl to fail if not
  possible to upgrade. Possibly introduce an option that makes libcurl use
  http2 at once over http://

 Over an https:// URL

  If CURLOPT_HTTP_VERSION is set to CURL_HTTP_VERSION_2, libcurl will use ALPN
  (or NPN) to negotiate which protocol to continue with. Possibly introduce an
  option that will cause libcurl to fail if not possible to use http2.