Websockets to Nginx reverse proxy

Phoenix Forum Questions / Help
1

I’m using Nginx to terminate ssl and reverse proxy to my phoenix application, which I’m deploying via docker. The web traffic works fine, but websockets are giving me the business.

I get a 403 forbidden when the socket tries to connect. I’m suspecting it’s something to do with my config, which is

config :exertion, Exertion.Endpoint,
  http: [port: {:system, "PORT"}],
  url: [host: "exertion.io", port: {:system, "PORT"}],
  cache_static_manifest: "priv/static/manifest.json"

I’ve configured nginx as recommended to proxy websocket connections.

2

Can you tell if that 403 is from your application or from nginx?

3

It’s was coming from the application. I feel incredibly stupid, but the reason it was erroring out is because I was providing “localhost” as one of the arguments to check_origin, rather than 127.0.0.1

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