This patch backports URI#hostname to ruby 1.9.2 and older.

URI#hostname is used for IPv6 support in Excon.

URI#hostname was added in stdlib in v1_9_3_0 in this commit:
  ruby/ruby@5fd45a4

Addressable::URI is also an URI parser accepted in some parts of Excon.
Addressable::URI#hostname was added in addressable-2.3.5+ in this commit:
  sporkmonger/addressable@1b94abb

Users who want to use Addressable::URI to parse URIs must upgrade to 2.3.5 or newer.

Author: jrafanie

lib/excon.rb

@@ -11,6 +11,8 @@
 require 'zlib'
 require 'stringio'
 
+require 'excon/extensions/uri'
+
 require 'excon/middlewares/base'
 require 'excon/middlewares/expects'
 require 'excon/middlewares/idempotent'

lib/excon/extensions/uri.rb

@@ -0,0 +1,33 @@
+# TODO: Remove this monkey patch once ruby 1.9.3+ is the minimum supported version.
+#
+# This patch backports URI#hostname to ruby 1.9.2 and older.
+# URI#hostname is used for IPv6 support in Excon.
+#
+# URI#hostname was added in stdlib in v1_9_3_0 in this commit:
+#   https://github.com/ruby/ruby/commit/5fd45a4b79dd26f9e7b6dc41142912df911e4d7d
+#
+# Addressable::URI is also an URI parser accepted in some parts of Excon.
+# Addressable::URI#hostname was added in addressable-2.3.5+ in this commit:
+#   https://github.com/sporkmonger/addressable/commit/1b94abbec1f914d5f707c92a10efbb9e69aab65e
+#
+# Users who want to use Addressable::URI to parse URIs must upgrade to 2.3.5 or newer.
+require 'uri'
+unless URI("http://foo/bar").respond_to?(:hostname)
+  module URI
+    class Generic
+      # extract the host part of the URI and unwrap brackets for IPv6 addresses.
+      #
+      # This method is same as URI::Generic#host except
+      # brackets for IPv6 (and future IP) addresses are removed.
+      #
+      # u = URI("http://[::1]/bar")
+      # p u.hostname      #=> "::1"
+      # p u.host          #=> "[::1]"
+      #
+      def hostname
+        v = self.host
+        /\A\[(.*)\]\z/ =~ v ? $1 : v
+      end
+    end
+  end
+end