fix(proxy): proxy to correct port

When port is not defined in the `proxies` config, i.e. when proxying to
Karma server itself, the proxy needs to use the `config.port`
instead of the default port.

lib/middleware/proxy.js

@@ -2,9 +2,8 @@ var url = require('url');
 var httpProxy = require('http-proxy');
 
 var log = require('../logger').create('proxy');
-var constant = require('../constants');
 
-var parseProxyConfig = function(proxies) {
+var parseProxyConfig = function(proxies, config) {
   var proxyConfig = {};
   var endsWithSlash = function(str) {
     return str.substr(-1) === '/';
@@ -45,8 +44,8 @@ var parseProxyConfig = function(proxies) {
 
     if (!proxyConfig[proxyPath].port) {
       if (!proxyConfig[proxyPath].host) {
-        proxyConfig[proxyPath].host = constant.DEFAULT_HOSTNAME;
-        proxyConfig[proxyPath].port = constant.DEFAULT_PORT;
+        proxyConfig[proxyPath].host = config.hostname;
+        proxyConfig[proxyPath].port = config.port;
       } else {
         proxyConfig[proxyPath].port = proxyConfig[proxyPath].https ? '443' : '80';
       }
@@ -63,8 +62,8 @@ var parseProxyConfig = function(proxies) {
  * @param proxies a map of routes to proxy url
  * @return {Function} handler function
  */
-var createProxyHandler = function(proxy, proxyConfig, proxyValidateSSL, urlRoot) {
-  var proxies = parseProxyConfig(proxyConfig);
+var createProxyHandler = function(proxy, proxyConfig, proxyValidateSSL, urlRoot, config) {
+  var proxies = parseProxyConfig(proxyConfig, config);
   var proxiesList = Object.keys(proxies).sort().reverse();
 
   if (!proxiesList.length) {
@@ -126,5 +125,5 @@ var createProxyHandler = function(proxy, proxyConfig, proxyValidateSSL, urlRoot)
 exports.create = function(/* config */ config, /* config.proxies */ proxies,
   /* config.proxyValidateSSL */ validateSSL) {
   return createProxyHandler(new httpProxy.RoutingProxy({changeOrigin: true}),
-    proxies, validateSSL, config.urlRoot);
+    proxies, validateSSL, config.urlRoot, config);
 };

test/e2e/proxy/foo.js

@@ -0,0 +1 @@
+'/base/foo.js source'

test/e2e/proxy/karma.conf.js

@@ -0,0 +1,27 @@
+module.exports = function(config) {
+  config.set({
+    frameworks: ['jasmine'],
+
+    files: [
+      '*.js'
+    ],
+
+    // Test local proxying, with non-default port.
+    port: 9877,
+    proxies: {
+      '/foo.js': '/base/foo.js'
+    },
+
+    autoWatch: true,
+
+    browsers: [process.env.TRAVIS ? 'Firefox' : 'Chrome'],
+
+    reporters: ['dots'],
+
+    plugins: [
+      'karma-jasmine',
+      'karma-chrome-launcher',
+      'karma-firefox-launcher'
+    ],
+  });
+};

test/e2e/proxy/test.js

@@ -0,0 +1,14 @@
+function httpGet(url) {
+  var xmlHttp = new XMLHttpRequest();
+
+  xmlHttp.open('GET', url, false);
+  xmlHttp.send(null);
+
+  return xmlHttp.responseText;
+}
+
+describe('foo', function() {
+  it('should should serve /foo.js', function() {
+    expect(httpGet('/foo.js')).toBe("'/base/foo.js source'\n");
+  });
+});

test/unit/middleware/proxy.spec.coffee

@@ -148,17 +148,19 @@ describe 'middleware.proxy', ->
 
   it 'should handle proxy configs with only basepaths', ->
     proxy = {'/base': '/proxy/test'}
-    parsedProxyConfig = m.parseProxyConfig proxy
+    config = {port: 9877, hostname: 'localhost'}
+    parsedProxyConfig = m.parseProxyConfig proxy, config
     expect(parsedProxyConfig).to.deep.equal {
-      '/base': {host: c.DEFAULT_HOSTNAME, port: c.DEFAULT_PORT,
+      '/base': {host: config.hostname, port: config.port,
       baseProxyUrl: '/proxy/test', https:false}
     }
 
   it 'should normalize proxy url with only basepaths', ->
     proxy = {'/base/': '/proxy/test'}
-    parsedProxyConfig = m.parseProxyConfig proxy
+    config = {port: 9877, hostname: 'localhost'}
+    parsedProxyConfig = m.parseProxyConfig proxy, config
     expect(parsedProxyConfig).to.deep.equal {
-      '/base/': {host: c.DEFAULT_HOSTNAME, port: c.DEFAULT_PORT,
+      '/base/': {host: config.hostname, port: config.port,
       baseProxyUrl: '/proxy/test/', https:false}
     }