502 Bad Gateway with nginx | Google App Engine | Node JS

Question

I am hosting the web app on Google Cloud Platform with App Engine and I am using ExpressJS and MongoDB, which is hosted on mLab.

Everything worked well until 1/1/201

Answer 1

check out the logs for any deployment errors

$ gcloud app logs read

I have came across a similar issue with the code provided by this tutorial (https://cloud.google.com/nodejs/getting-started/authenticate-users)

And found there was a missing dependency. I fixed the missing dependency and the app is deployed and working fine.

Details into the issue: https://github.com/GoogleCloudPlatform/nodejs-getting-started/issues/106

Answer 2

I had the same problem with Express. What solved it for me was to not provide an IP address for the app.

So my old code would be:

var ip = "127.0.0.1";
var port = "8080";
var server = http.createServer(app);
server.listen(port, ip);

This would result in a 502 in app engine.

Removing the ip was the solution for me.

server.listen(port);