How to set up CORS for Socket.io inside Docker container + PM2?

Question

JavaScript

When I try to run an Express application inside a docker container, I get the following error. I tried to install already npm-cors, I added the headers by hand. Everything works fine either outside the docker container, or without Pm2, but doesn’t want to at the same time. Same thing with forever. I will be glad to ideas.

Answer 1

https://stackoverflow.com/questions/42803394/cors-...
tl;dr remove * and write a normal address in origin