[Bug 1567697] Re: libcurl is missing http2 support

[Alvaro Figueroa]

In 16.04 beta you only need to have the package libnghttp2-dev as a
build-dep, download the ubuntu package source, recompile and installed
the newly created package.

$ sudo apt-get build-dep curl
$ sudo apt-get install libnghttp2-dev
$ sudo apt-get source curl
$ sudo debian/rules binary
$ sudo dpkg -i *deb
(actually, you can only install the nss, gnutls or openssl version of the lib package. Let's go with openssl here)

$ curl --http2 -I nghttp2.org
HTTP/1.1 101 Switching Protocols
Connection: Upgrade
Upgrade: h2c

HTTP/2.0 200
date:Fri, 08 Apr 2016 22:19:10 GMT
content-type:text/html
content-length:6646
last-modified:Sun, 03 Apr 2016 06:53:14 GMT
etag:"5700bdda-19f6"
link:</stylesheets/screen.css>; rel=preload; as=stylesheet
accept-ranges:bytes
x-backend-header-rtt:0.00102
server:nghttpx nghttp2/1.10.0-DEV
via:2 nghttpx
x-frame-options:SAMEORIGIN
x-xss-protection:1; mode=block
x-content-type-options:nosniff

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https://bugs.launchpad.net/bugs/1567697

Title:
  libcurl is missing http2 support

Status in curl package in Ubuntu:
  Confirmed

Bug description:
  libcurl supports HTTP/2.0 through libnghttp2, but the package on
  Ubuntu is not compiled with it.

  Alternatively, a libcurl4-(gnutls|openssl)-nghttp2 might be a good
  idea.

  See also: https://curl.haxx.se/docs/http2.html

  curl CLI tool should not need an update, as it already has the
  commandline switches, but when you use them it comes back with
  unsupported protocol.

  drwilco at eris:~$ curl --http2 www.google.com
  curl: (1) Unsupported protocol

  
  drwilco at eris:~$ lsb_release -rd
  Description:	Ubuntu Xenial Xerus (development branch)
  Release:	16.04
  root at eris:~# apt-cache policy libcurl3
  libcurl3:
    Installed: 7.47.0-1ubuntu2
    Candidate: 7.47.0-1ubuntu2
    Version table:
   *** 7.47.0-1ubuntu2 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

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