Nginx Reverse Proxy – Setup with Transmission Using Docker Compose

I'm trying to get Nginx working as a reverse proxy for the Transmission web client. Both are in separate Docker containers with Docker Compose.

Ive read previous similar questions, but these have not worked for me:
https://unix.stackexchange.com/questions/64812/get-transmission-web-interface-working-with-web-server

https://stackoverflow.com/questions/15391073/nginx-transmission-daemon-url-rewrite

Nginx gives me the error:

[error] 6#6: *3 "/etc/nginx/html/transmission/web/index.html" is not found (2: No such file or directory), client: 172.18.0.1, server: torrent.localhost, request: "GET /transmission/web/ HTTP/1.1", host: "torrent.localhost"

This makes me suspect that the proxy_pass is not working correctly as its still trying to grab the html file from the file system.

Any help would be very much appreciated!

• When I go to http://localhost i get hello world!
• When I got to http://torrent.localhost I get a native prompt for username and password
• When I type in the username and password I get redirected to http://torrent.localhost/transmission/web/ with a 404: Not Found
• When I go to http://torrent.localhost:9091 I get the native prompt, however it logins in and continues to the Transmission web client successfully

docker-compose.yml:

version: "2"
services:
  nginx:
    image: nginx
    container_name: nginx-proxy
    volumes:
      - ./nginx/nginx.conf:/etc/nginx/nginx.conf
      - ./www:/data/www
    ports:
    - "80:80"
    - "443:443"

  transmission:
    image: linuxserver/transmission
    container_name: transmission
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Europe/London
      - USER=username
      - PASS=password
    volumes:
      - ./transmission/config:/config
      - ./transmission/downloads:/downloads
      - ./transmission/watch:/watch
    ports:
      - "9091:9091"
      - "51413:51413"
      - "51413:51413/udp"
    restart: unless-stopped

nginx.conf:

events {
}

http {
    server {
        listen 80;
        server_name localhost 127.0.0.1;
        root /data/www;
        location = / {
            index index.html;
        }
    }

    server {
        server_name torrent.localhost;
        location = / {
            proxy_read_timeout 300;
            proxy_pass_header  X-Transmission-Session-Id;
            proxy_set_header   X-Forwarded-Host $host;
            proxy_set_header   X-Forwarded-Server $host;
            proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_pass http://transmission:9091;
        }
    }
}

index.html:

hello world!