Migrating from Nginx - PathPrefix / rewrite problems

Traefik Traefik v2 (latest)
,
1

I am migrating from Nginx as a reverse proxy to Traefik v2, and have run into some issues with PathPrefix and rewrite rules.

I use docker-compose to run home-assistant and am adding zwavejs2mqtt as a separate container (to replace home-assistant's deprecated zwave integration), and use balenaCloud to manage my docker containers. Due to some odd issues with websocket interference between the two containers, Traefik looks like it will be a better solution than nginx for my purposes. But I'm a newbie to Traefik, and I'm having some trouble getting the path forwarding to work with the zwavejs2mqtt container.

I'm getting errors in the console such as "Manifest: Line: 1, column: 4, Unexpected data after root element." (Which I'm guessing means that I may not have set up the stripprefix middleware correctly).

Screen Shot 2021-08-11 at 12.42.58 PM
Screen Shot 2021-08-11 at 12.42.58 PM963×166 42 KB

My docker-compose:

version: '2.1'
volumes:
  store:
  hass-config:
services:
  whoami:
    image: containous/whoami:latest
    labels:
      traefik.enable: true
      traefik.http.routers.whoami.entrypoints: http
      traefik.http.routers.whoami.rule: "PathPrefix(`/hello`)"
  zwave:
    container_name: zwave
    build: ./zwavejs2mqtt
    restart: always
    tty: true
    stop_signal: SIGINT
    environment:
      - SESSION_SECRET=mysupersecretkey
    devices:
      - "/dev/ttyACM0:/dev/ttyACM0"
    volumes:
      - "store:/usr/src/app/store"
    ports:
      - '8091:8091' # port for web interface
      - '3000:3000' # port for zwave-js websocket server
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.zwave.service=zwave"
      - "traefik.http.routers.zwave.entrypoints=http"
      - "traefik.http.routers.zwave.rule=PathPrefix(`/zwave`)"
      - "traefik.http.services.zwave.loadbalancer.server.port=8091"
      - "traefik.http.middlewares.zwave-strip.stripprefix.prefixes=/zwave"
      - "traefik.http.routers.zwave.middlewares=zwave-strip"
      - "traefik.http.middlewares.zwave.headers.customrequestheaders.X-External-Path=/zwave"

  homeassistant:
    image: ghcr.io/home-assistant/raspberrypi3-homeassistant:2021.7.4
    restart: unless-stopped
    volumes:
      - 'hass-config:/config'
    ports:
      - '8123:8123'
      - '1883:1883'
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.homeassistant.entrypoints=http"
      - "traefik.http.routers.homeassistant.rule=PathPrefix(`/`)"
      - "traefik.http.services.homeassistant.loadbalancer.server.port=8123"
      - "traefik.http.routers.homeassistant.service=homeassistant"
  traefik:
    image: traefik:latest
    network_mode: host
    environment:
      TRAEFIK_LOG_LEVEL: INFO
      TRAEFIK_ENTRYPOINTS_HTTP_ADDRESS: :80
      TRAEFIK_PROVIDERS_DOCKER: true
      TRAEFIK_PROVIDERS_DOCKER_EXPOSEDBYDEFAULT: false
      TRAEFIK_PROVIDERS_DOCKER_ENDPOINT: unix:///var/run/balena.sock
    ports:
      - "80:80"
    labels:
      io.balena.features.balena-socket: true 
      traefik.http.routers.http.entrypoints: http

My old nginx configuration (which did handle the path routing as expected, but ran into websocket problems):

map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

upstream homeassistant {
    server sh_homeassistant:8123;
}

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name *.balena-devices.com;

    location / {
        proxy_pass http://homeassistant;
        proxy_set_header Host $host;

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    location /api/websocket {
        proxy_pass http://homeassistant/api/websocket;
        proxy_set_header Host $host;

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    location /zwavejs2mqtt {
        rewrite ^ $request_uri;
        rewrite '^/zwavejs2mqtt(/.*)$' $1 break;
        proxy_pass https://zwavejs2mqtt:8091;
        proxy_set_header X-External-Path /zwavejs2mqtt;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }
}

My current supposition is that I've not correctly translated the rewrite rule in my nginx config (which I set up as the zwavejs2mqtt guide instructs - ZwaveJS2Mqtt) to the traefik labels, but I've not been able to find the solution, and the issue certainly could be something else.

I'd appreciate any help in resolving this issue. Thanks!