Add support for local host and port binding

lib/httparty.rb

@@ -47,6 +47,8 @@ def self.included(base)
   # [:+limit+:] Maximum number of redirects to follow. Takes precedences over :+no_follow+.
   # [:+query+:] Query string, or a Hash representing it. Normalized according to the same rules as :+body+. If you specify this on a POST, you must use a Hash. See also HTTParty::ClassMethods.default_params.
   # [:+timeout+:] Timeout for opening connection and reading data.
+  # [:+local_host:] Local address to bind to before connecting.
+  # [:+local_port:] Local port to bind to before connecting.
   #
   # There are also another set of options with names corresponding to various class methods. The methods in question are those that let you set a class-wide default, and the options override the defaults on a request-by-request basis. Those options are:
   # * :+base_uri+: see HTTParty::ClassMethods.base_uri.

lib/httparty/connection_adapter.rb

@@ -89,6 +89,25 @@ def connection
         http.ciphers = options[:ciphers]
       end
 
+      # Bind to a specific local address or port
+      #
+      # @see https://bugs.ruby-lang.org/issues/6617
+      if options[:local_host]
+        if RUBY_VERSION >= "2.0.0"
+          http.local_host = options[:local_host]
+        else
+          Kernel.warn("Warning: option :local_host requires Ruby version 2.0 or later")
+        end
+      end
+
+      if options[:local_port]
+        if RUBY_VERSION >= "2.0.0"
+          http.local_port = options[:local_port]
+        else
+          Kernel.warn("Warning: option :local_port requires Ruby version 2.0 or later")
+        end
+      end
+
       return http
     end
 

spec/httparty/connection_adapter_spec.rb

@@ -202,6 +202,13 @@
         end
       end
 
+      context 'when providing a local bind address and port' do
+        let(:options) { {:local_host => "127.0.0.1", :local_port => 12345 } }
+
+        its(:local_host) { should == '127.0.0.1' }
+        its(:local_port) { should == 12345 }
+      end if RUBY_VERSION >= '2.0'
+
       context "when providing PEM certificates" do
         let(:pem) { :pem_contents }
         let(:options) { {:pem => pem, :pem_password => "password"} }