Add support for localAddress

When we make outgoing requests, we may want to bind to a specific local
address. This change allows the localAddress property to be specified
via the options object.

lib/http-proxy.js

@@ -42,6 +42,7 @@ module.exports.createProxyServer = module.exports.createServer = function create
  * ws : <true/false, if you want to proxy websockets>
  * xfwd : <true/false, adds x-forward headers>
  * secure : <true/false, verify SSL certificate>
+ * localAddress : <Local interface string to bind for outgoing connections>
  * }
  *
  * NOTE: `options.ws` and `options.ssl` are optional.

lib/http-proxy/common.js

@@ -45,6 +45,7 @@ common.setupOutgoing = function(outgoing, options, req, forward) {
 
  outgoing.agent = options.agent || false;
  outgoing.path = url.parse(req.url).path;
+ outgoing.localAddress = options.localAddress;
  return outgoing;
 };
 

test/lib-http-proxy-common-test.js

@@ -15,6 +15,7 @@ describe('lib/http-proxy/common.js', function () {
  port : 'you',
  },
  headers: {'fizz': 'bang', 'overwritten':true},
+ localAddress: 'local.address',
  },
  {
  method : 'i',
@@ -34,6 +35,7 @@ describe('lib/http-proxy/common.js', function () {
  expect(outgoing.headers.pro).to.eql('xy');
  expect(outgoing.headers.fizz).to.eql('bang');
  expect(outgoing.headers.overwritten).to.eql(true);
+ expect(outgoing.localAddress).to.eql('local.address');
  });
 
  it('should set the agent to false if none is given', function () {