add HTTP proxy support for Excon

Gemfile

@@ -8,7 +8,7 @@ group :test do
   gem 'coveralls', :require => false
   gem 'em-http-request', '>= 1.0', :require => 'em-http'
   gem 'em-synchrony', '>= 1.0', :require => ['em-synchrony', 'em-synchrony/em-http']
-  gem 'excon', '>= 0.16.1'
+  gem 'excon', '>= 0.25.3'
   gem 'httpclient', '>= 2.2'
   gem 'leftright', '>= 0.9', :require => false
   gem 'minitest', '~> 5.0.5'

lib/faraday/adapter/excon.rb

@@ -33,6 +33,16 @@ def call(env)
             opts[:connect_timeout]   = req[:open_timeout]
             opts[:write_timeout]     = req[:open_timeout]
           end
+
+          if req[:proxy]
+            opts[:proxy] = {
+              :host     => req[:proxy][:uri].host,
+              :port     => req[:proxy][:uri].port,
+              :scheme   => req[:proxy][:uri].scheme,
+              :user     => req[:proxy][:user],
+              :password => req[:proxy][:password]
+            }
+          end
         end
 
         conn = ::Excon.new(env[:url].to_s, opts.merge(@connection_options))