node.js - 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 1/1/2017. I had vm:true before and now was forced to change the env to flex. Now I am getting 502 bad gateway error with nginx. App engine doesn't allow us to change the nginx config file.

I had tried the suggestion from this post: Google App Engine 502 (Bad Gateway) with NodeJS but still doesn't work.

For some reason, I have another app with exactly the same setting on app engine and it works perfectly.

Any suggestion will be greatly appreciated. Thank you.

question from:https://stackoverflow.com/questions/41472049/502-bad-gateway-with-nginx-google-app-engine-node-js

Answer 1

app should always listen to port 8080, google forwards all request from 80 to 8080 https://cloud.google.com/appengine/docs/flexible/custom-runtimes/build#listen_to_port_8080