[test] Add core `test-http-proxy` test

Modifications:

  * make client connect to `PROXY_PORT` instead of `PORT`

test/core/simple/test-http-proxy.js

+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+var http = require('http');
+var url = require('url');
+
+var PROXY_PORT = common.PORT;
+var BACKEND_PORT = common.PORT + 1;
+
+var cookies = [
+  'session_token=; path=/; expires=Sun, 15-Sep-2030 13:48:52 GMT',
+  'prefers_open_id=; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT'
+];
+
+var headers = {'content-type': 'text/plain',
+                'set-cookie': cookies,
+                'hello': 'world' };
+
+var backend = http.createServer(function(req, res) {
+  common.debug('backend request');
+  res.writeHead(200, headers);
+  res.write('hello world\n');
+  res.end();
+});
+
+var proxy = http.createServer(function(req, res) {
+  common.debug('proxy req headers: ' + JSON.stringify(req.headers));
+  var proxy_req = http.get({
+    port: BACKEND_PORT,
+    path: url.parse(req.url).pathname
+  }, function(proxy_res) {
+
+    common.debug('proxy res headers: ' + JSON.stringify(proxy_res.headers));
+
+    assert.equal('world', proxy_res.headers['hello']);
+    assert.equal('text/plain', proxy_res.headers['content-type']);
+    assert.deepEqual(cookies, proxy_res.headers['set-cookie']);
+
+    res.writeHead(proxy_res.statusCode, proxy_res.headers);
+
+    proxy_res.on('data', function(chunk) {
+      res.write(chunk);
+    });
+
+    proxy_res.on('end', function() {
+      res.end();
+      common.debug('proxy res');
+    });
+  });
+});
+
+var body = '';
+
+var nlistening = 0;
+function startReq() {
+  nlistening++;
+  if (nlistening < 2) return;
+
+  var client = http.get({
+    port: common.PROXY_PORT,
+    path: '/test'
+  }, function(res) {
+    common.debug('got res');
+    assert.equal(200, res.statusCode);
+
+    assert.equal('world', res.headers['hello']);
+    assert.equal('text/plain', res.headers['content-type']);
+    assert.deepEqual(cookies, res.headers['set-cookie']);
+
+    res.setEncoding('utf8');
+    res.on('data', function(chunk) { body += chunk; });
+    res.on('end', function() {
+      proxy.close();
+      backend.close();
+      common.debug('closed both');
+    });
+  });
+  common.debug('client req');
+}
+
+common.debug('listen proxy');
+proxy.listen(PROXY_PORT, startReq);
+
+common.debug('listen backend');
+backend.listen(BACKEND_PORT, startReq);
+
+process.on('exit', function() {
+  assert.equal(body, 'hello world\n');
+});