Updated dependencies

README.md

@@ -28,6 +28,9 @@ Then, clone this project:
 $ git clone https://github.com/gfeiyou/syn_bio_vis.git
 ```
 
+### Set up environment variables
+ following environment variables needs to be set
+
 ### Set up Server
 Inside the folder `syn_bio_vis/server/`, run `npm install` to install all
 the dependencies for the server.

server/index.js

@@ -9,7 +9,14 @@ const app = express();
 
 app.use(bodyParser.json({ limit: "30mb", extended: true }));
 app.use(bodyParser.urlencoded({ limit: "30mb", extended: true }));
-app.use(cors());
+
+const corsOptions ={
+    origin: process.env.CLIENT_ORIGIN || 'http://localhost:3000',
+    credentials:true,            //access-control-allow-credentials:true
+    optionSuccessStatus:200
+}
+
+app.use(cors(corsOptions));
 
 // All routes inside routes/simRoutes must append "/sim" in the front
 // app.use('/sim', simRoutes);
@@ -18,5 +25,6 @@ app.use('/tutor', tutorRoutes);
 
 // Start the server
 // TODO: Change PORT for production code
-const PORT = process.env.PORT || 3001;
+const PORT = process.env.SERVER_PORT || 3000;
+// const HOSTNAME = "0.0.0.0";
 app.listen(PORT, () => console.log(`Server running on port ${PORT}`));