Allow optional redirect host rewriting.

Author: samccone

lib/http-proxy/passes/web-incoming.js

@@ -144,7 +144,7 @@ web_o = Object.keys(web_o).map(function(pass) {
     proxyReq.on('response', function(proxyRes) {
       if(server) { server.emit('proxyRes', proxyRes, req, res); }
       for(var i=0; i < web_o.length; i++) {
-       if(web_o[i](req, res, proxyRes)) { break; }
+       if(web_o[i](req, res, proxyRes, options)) { break; }
       }
 
       // Allow us to listen when the proxy has completed

lib/http-proxy/passes/web-outgoing.js

@@ -1,5 +1,6 @@
-var passes = exports;
-
+var url           = require('url')
+var passes        = exports;
+var redirectRegex = /^30(1|2|7|8)$/;
 /*!
  * Array of passes.
  *
@@ -43,6 +44,13 @@ var passes = exports;
     }
   },
 
+  function setRedirectHostRewrite(req, res, proxyRes, options) {
+    if (options.hostRewrite && redirectRegex.test(proxyRes.statusCode)) {
+      var u = url.parse(proxyRes.headers['location']);
+      u.host = options.hostRewrite;
+      proxyRes.headers['location'] = u.format();
+    }
+  },
   /**
    * Copy headers from proxyResponse to response
    * set each header in response object.