[fix] Change sec-websocket-location header when proxying WSS --> WS. Added test coverage for this scenario

Author: indexzero

Diff for: lib/node-http-proxy.js

@@ -222,6 +222,7 @@ var HttpProxy = exports.HttpProxy = function (options) {
   options           = options || {};
   options.target    = options.target || {};
 
+  this.https        = options.https;
   this.forward      = options.forward;
   this.target       = options.target;
   this.changeOrigin = options.changeOrigin || false;
@@ -706,9 +707,19 @@ HttpProxy.prototype.proxyWebSocketRequest = function (req, socket, head, options
       // Get the Non-Printable data
       data = data.slice(Buffer.byteLength(sdata), data.length);
 
+      //
       // Replace the host and origin headers in the Printable data
+      //
       sdata = sdata.replace(remoteHost, options.host)
                    .replace(remoteHost, options.host);
+      
+      if (self.https && !self.target.https) {
+        //
+        // If the proxy server is running HTTPS but the client is running
+        // HTTP then replace `ws` with `wss` in the data sent back to the client.
+        //
+        sdata = sdata.replace('ws:', 'wss:');
+      }
 
       try {
         //

Diff for: test/web-socket-proxy-test.js

@@ -87,6 +87,8 @@ vows.describe('node-http-proxy/websocket/' + wsprotocol).addBatch({
           assert.equal(msg, 'from client');
         },
         "the origin and sec-websocket-origin headers should match": function (err, msg, headers) {
+          assert.isString(headers.response['sec-websocket-location']);
+          assert.isTrue(headers.response['sec-websocket-location'].indexOf(wsprotocol) !== -1);
           assert.equal(headers.request.Origin, headers.response['sec-websocket-origin']);
         }
       },
@@ -128,6 +130,8 @@ vows.describe('node-http-proxy/websocket/' + wsprotocol).addBatch({
           assert.equal(msg, 'from server');
         },
         "the origin and sec-websocket-origin headers should match": function (err, msg, headers) {
+          assert.isString(headers.response['sec-websocket-location']);
+          assert.isTrue(headers.response['sec-websocket-location'].indexOf(wsprotocol) !== -1);
           assert.equal(headers.request.Origin, headers.response['sec-websocket-origin']);
         }
       }