initial rtc template, send text messages, doesn't work in firefox

app.js

@@ -0,0 +1,83 @@
+const express = require('express')
+const bodyParser = require('body-parser')
+const app = express()
+var redis = require("redis"),
+    client = redis.createClient();
+
+client.on('error', function(err) {
+  console.log(err);
+})
+
+app.use(bodyParser.json());
+
+app.use(express.static('public'))
+
+app.use(function(req, res, next) {
+  res.header("Access-Control-Allow-Origin", "*");
+  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
+  next();
+});
+
+function insert(create_key) {
+  let id = Math.floor(Math.random()*10000).toString();
+  client.set(id, create_key, redis.print);
+  return id;
+}
+
+app.post('/local_answer/:id', function(req, res) {
+  let id = req.params.id;
+  client.set(id, JSON.stringify(req.body), redis.print);
+  res.send('ok');
+})
+
+app.get('/receive_offer/:id', function(req, res) {
+  let id = req.params.id;
+  client.get(id, function(err, reply) {
+  if (!reply) {
+      res.send('error');
+    } else {
+      res.send(reply);
+    }
+  })
+})
+
+
+app.get('/receive_answer/:id', function(req, res) {
+  let id = req.params.id;
+  client.get(id, function(err, reply) {
+    if (!reply) {
+      res.send('error');
+    } else {
+      client.del(id);
+      res.send(reply);
+    }
+  })
+})
+
+app.post('/join/:id', function(req, res) {
+  let id = req.params.id;
+  client.get(id, function(err, reply) {
+    if (!reply) {
+      res.send('error')
+    } else {
+      res.send(reply);
+    }
+  }) 
+})
+
+app.post('/create', function(req, res) {
+  let id = insert(JSON.stringify(req.body));
+  res.send(id);
+})
+
+
+app.get('/', function (req, res) {
+  console.log('get');
+  res.send('Hello World!')
+})
+
+app.listen(3000, function () {
+  console.log('Example app listening on port 3000!')
+})
+
+