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diff --git a/src/node/performance/benchmark_server_express.js b/src/node/performance/benchmark_server_express.js
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+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/**
+ * Benchmark server module
+ * @module
+ */
+
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+var http = require('http');
+var https = require('https');
+var EventEmitter = require('events');
+var util = require('util');
+
+var express = require('express');
+var bodyParser = require('body-parser')
+
+function unaryCall(req, res) {
+  var reqObj = req.body;
+  var payload = {body: '0'.repeat(reqObj.response_size)};
+  res.json(payload);
+}
+
+function BenchmarkServer(host, port, tls, generic, response_size) {
+  var app = express();
+  app.use(bodyParser.json())
+  app.put('/serviceProto.BenchmarkService.service/unaryCall', unaryCall);
+  this.input_host = host;
+  this.input_port = port;
+  if (tls) {
+    var credentials = {};
+    var key_path = path.join(__dirname, '../test/data/server1.key');
+    var pem_path = path.join(__dirname, '../test/data/server1.pem');
+
+    var key_data = fs.readFileSync(key_path);
+    var pem_data = fs.readFileSync(pem_path);
+    credentials['key'] = key_data;
+    credentials['cert'] = pem_data;
+    this.server = https.createServer(credentials, app);
+  } else {
+    this.server = http.createServer(app);
+  }
+}
+
+util.inherits(BenchmarkServer, EventEmitter);
+
+BenchmarkServer.prototype.start = function() {
+  var self = this;
+  this.server.listen(this.input_port, this.input_hostname, function() {
+    self.last_wall_time = process.hrtime();
+    self.emit('started');
+  });
+};
+
+BenchmarkServer.prototype.getPort = function() {
+  return this.server.address().port;
+};
+
+BenchmarkServer.prototype.mark = function(reset) {
+  var wall_time_diff = process.hrtime(this.last_wall_time);
+  if (reset) {
+    this.last_wall_time = process.hrtime();
+  }
+  return {
+    time_elapsed: wall_time_diff[0] + wall_time_diff[1] / 1e9,
+    // Not sure how to measure these values
+    time_user: 0,
+    time_system: 0
+  };
+};
+
+BenchmarkServer.prototype.stop = function(callback) {
+  this.server.close(callback);
+};
+
+module.exports = BenchmarkServer;