We have a website where we just added third-party authentications such as Google, Twitter. I'm trying to test these authentications in localhost (MacOS).
I'm running a docker to run nginx, here is docker-compose-dev.xml
version: "3"
services:
  https:
    image: bitnami/nginx:latest
    restart: unless-stopped
    ports:
      - 443:443/tcp
    volumes:
      - ./conf.d/dev.conf:/opt/bitnami/nginx/conf/server_blocks/default.conf:ro
    extra_hosts:
      - "host.docker.internal:host-gateway"
And here is conf.d/dev.conf:
upstream funfun {
   server 178.62.87.72:443;
}
server {
    listen  443 ssl;
    server_name localhost;
    ssl_certificate /certs/server.crt;
    ssl_certificate_key /certs/server.key;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_prefer_server_ciphers on;
    ssl_session_timeout 1d;
    ssl_stapling off;
    ssl_stapling_verify off;
    add_header Strict-Transport-Security max-age=15768000;
    add_header X-Frame-Options "";
    proxy_ssl_name "www.funfun.io";
    proxy_ssl_server_name on;
    location ~ /socialLoginSuccess {
        rewrite ^ '/#/socialLoginSuccess' redirect;
     }
    location ~ /auth/(.*) {
        proxy_pass  https://funfun/10studio/auth/$1?$query_string;
        proxy_set_header Host localhost;
     }
    location / {
        proxy_set_header    Host                $host;
        proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
        proxy_set_header    X-Forwarded-Proto   $scheme;
        proxy_set_header    Accept-Encoding     "";
        proxy_set_header    Proxy               "";
        proxy_pass          http://host.docker.internal:3000/;
        # These three lines added as per https://github.com/socketio/socket.io/issues/1942 to remove socketio error
        proxy_http_version 1.1;
        proxy_set_header   Upgrade $http_upgrade;
        proxy_set_header   Connection "upgrade";
    }
}
The way we launch the app is sudo PORT=8000 HTTPS=true ./node_modules/.bin/react-scripts start. Then https://localhost:8000/#/sign in a browser does open the page where the authentication buttons are.
The url of the button linking to Google authentication is https://localhost/10studio/auth/google. By clicking on it, I see first https://localhost/10studio/auth/google in the browser address bar, but the page to enter Google ID and password does not appear, then several seconds later, the url becomes https://localhost/#/socialLoginSuccess, and the page shows 502 Bad Gateway. I see the following logs in the terminal running nginx:
$ docker-compose --f docker-compose-dev.yml up
WARNING: Found orphan containers (frontend_10studio_1, frontend_frontend_1) for this project. If you removed or renamed this service in your compose file, you can run this command with the --remove-orphans flag to clean it up.
Starting frontend_https_1 ... done
Attaching to frontend_https_1
https_1  | nginx 21:24:05.37 
https_1  | nginx 21:24:05.38 Welcome to the Bitnami nginx container
https_1  | nginx 21:24:05.38 Subscribe to project updates by watching https://github.com/bitnami/bitnami-docker-nginx
https_1  | nginx 21:24:05.39 Submit issues and feature requests at https://github.com/bitnami/bitnami-docker-nginx/issues
https_1  | nginx 21:24:05.39 
https_1  | nginx 21:24:05.39 INFO  ==> ** Starting NGINX setup **
https_1  | nginx 21:24:05.42 INFO  ==> Validating settings in NGINX_* env vars
https_1  | nginx 21:24:05.43 INFO  ==> Initializing NGINX
https_1  | realpath: /bitnami/nginx/conf/vhosts: No such file or directory
https_1  | 
https_1  | nginx 21:24:05.45 INFO  ==> ** NGINX setup finished! **
https_1  | nginx 21:24:05.47 INFO  ==> ** Starting NGINX **
https_1  | 172.19.0.1 - - [08/Nov/2021:21:25:06 +0000] "GET /10studio/auth/google HTTP/1.1" 302  0 "https://localhost:8000/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36" "-"
https_1  | 172.19.0.1 - - [08/Nov/2021:21:25:07 +0000] "GET /auth/google/callback?code=4%2F0AX4XfWiqleRl2StBpNOgOtzjqZlftvq9-uDmiPVLZqcgo2xjjhohu47iAV5qxoJThaQYzg&scope=email+profile+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+openid&authuser=0&prompt=none HTTP/1.1" 302  82 "https://localhost:8000/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36" "-"
https_1  | 172.19.0.1 - - [08/Nov/2021:21:25:07 +0000] "GET /auth/signinSuccess HTTP/1.1" 302  82 "https://localhost:8000/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36" "-"
https_1  | 172.19.0.1 - - [08/Nov/2021:21:25:07 +0000] "GET /socialLoginSuccess HTTP/1.1" 302  138 "https://localhost:8000/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36" "-"
https_1  | 2021/11/08 21:25:39 [error] 27#27: *2 connect() failed (110: Connection timed out) while connecting to upstream, client: 172.19.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "http://192.168.65.1:3000/", host: "localhost", referrer: "https://localhost:8000/"
https_1  | 172.19.0.1 - - [08/Nov/2021:21:25:39 +0000] "GET / HTTP/1.1" 502  552 "https://localhost:8000/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36" "-"
Does anyone know what's wrong here?
Additionally, when I debug nginx, it is like a black box for me. I really want to be able to trace and see which url enters which location block, and changes to which url (by proxy_pass or rewrite, etc.). Does anyone have a better way to debug or log that?