Oops! Could not connect to this Shlink server.

[modem7]

Shlink version

3.7.1

PHP version

docker

How do you serve Shlink

Other (explain in summary)

Database engine

MariaDB

Database version

linuxserver/mariadb

Current behavior

Initializing database if needed... Success!
Updating database... Success!
Generating proxies... Success!
Clearing entities cache... Success!
Downloading GeoLite2 db file... Success!
Creating first API key... Success!
 
DBG | ts=1703057411354176300 logger=rpc msg=plugin was started address=tcp://127.0.0.1:6001 list of the plugins with RPC methods:=["lock","informer","jobs","resetter","app"] 
2023-12-20T07:30:11+0000	DEBUG	jobs        	initializing driver	{"pipeline": "shlink", "driver": "memory"}
2023-12-20T07:30:11+0000	DEBUG	jobs        	driver ready	{"pipeline": "shlink", "driver": "memory", "start": "2023-12-20T07:30:11+0000", "elapsed": "178.728µs"}
DBG | ts=1703057411492069600 logger=memory msg=pipeline was started driver=memory pipeline=shlink start=2023-12-20 07:30:11.492067565 +0000 UTC elapsed=3.572µs 
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
2023-12-20T07:30:11+0000	DEBUG	jobs        	exited from jobs pipeline processor
[INFO] RoadRunner server started; version: 2023.3.8, buildtime: 2023-12-14T16:05:30+0000
[INFO] sdnotify: not notified
2023-12-20T07:30:18+0000	DEBUG	jobs        	job was pushed successfully	{"ID": "f9f48838-b9c3-4cbc-8e0d-74ebfd7a363e", "pipeline": "shlink", "driver": "memory", "start": "2023-12-20T07:30:18+0000", "elapsed": "101.385µs"}
DBG | ts=1703057418728401000 logger=memory msg=message pushed to the priority queue current=1 limit=10 
2023-12-20T07:30:18+0000	DEBUG	jobs        	job processing was started	{"ID": "f9f48838-b9c3-4cbc-8e0d-74ebfd7a363e", "start": "2023-12-20T07:30:11+0000", "elapsed": "7.099587683s"}
2023-12-20T07:30:18+0000	INFO	server      	[2023-12-20T07:30:18.744410+00:00] [7115ba2f-1e1b-4c23-9431-4436134e6e62] Access.INFO - GET / 404 979
2023-12-20T07:30:18+0000	DEBUG	jobs        	job was processed successfully	{"ID": "f9f48838-b9c3-4cbc-8e0d-74ebfd7a363e", "start": "2023-12-20T07:30:11+0000", "elapsed": "7.130891398s"}
2023-12-20T07:41:47+0000	DEBUG	jobs        	job was pushed successfully	{"ID": "669d57e8-ba2c-478d-9c5e-20b0958e94cd", "pipeline": "shlink", "driver": "memory", "start": "2023-12-20T07:41:47+0000", "elapsed": "85.965µs"}
DBG | ts=1703058107512582100 logger=memory msg=message pushed to the priority queue current=1 limit=10 
2023-12-20T07:41:47+0000	DEBUG	jobs        	job processing was started	{"ID": "669d57e8-ba2c-478d-9c5e-20b0958e94cd", "start": "2023-12-20T07:30:11+0000", "elapsed": "11m35.88368823s"}
2023-12-20T07:41:47+0000	INFO	server      	[2023-12-20T07:41:47.526235+00:00] [8af5dfdd-0eb5-45f2-bb90-574393c4a4dc] Access.INFO - GET / 404 979
2023-12-20T07:41:47+0000	DEBUG	jobs        	job was processed successfully	{"ID": "669d57e8-ba2c-478d-9c5e-20b0958e94cd", "start": "2023-12-20T07:30:11+0000", "elapsed": "11m35.912176079s"}

This is occurring on both the locally hosted web client and the centrally hosted one.

Expected behavior

For the server to be seen.

https://shorturl.mydomain.com/rest/v2/health returns:
{"status":"pass","version":"3.7.1","links":{"about":"https://shlink.io","project":"https://github.com/shlinkio/shlink"}}

How to reproduce

  shlink:
    image: 'shlinkio/shlink:stable'
    container_name: Shlink
    environment:
        - DB_HOST=shlinkdb
        - DB_PASSWORD=$SHLINK_DB_PWD
        - DB_USER=$SHLINK_DB_USER
        - DB_DRIVER=maria
        - GEOLITE_LICENSE_KEY=$SHLINK_MAXIMIND
        - AUTO_RESOLVE_TITLES=true
        - TIMEZONE=$TZ
        - IS_HTTPS_ENABLED=true
        - DEFAULT_DOMAIN=$DOMAINNAME
        - INITIAL_API_KEY=$SHLINK_API_KEY
    logging:
      driver: "local"
      options:
        max-size: 10m
        max-file: "3"
    networks:
      pihole:
        ipv4_address: '172.22.0.115'
      isolated:
    labels:
      - autoheal=true
      - "traefik.enable=true"
      ## HTTP Routers
      - "traefik.http.routers.shlink-rtr.entrypoints=https"
      - "traefik.http.routers.shlink-rtr.rule=Host(`shorturl.$DOMAINNAME`)"
      ## Middlewares
      - "traefik.http.routers.shlink-rtr.middlewares=chain-no-auth@file" # No Authentication
      # - "traefik.http.routers.shlink-rtr.middlewares=chain-basic-auth@file" # Basic Authentication
      # - "traefik.http.routers.shlink-rtr.middlewares=chain-oauth-admins@file" # Keycloak
      ## HTTP Services
      - "traefik.http.routers.shlink-rtr.service=shlink-svc"
      - "traefik.http.services.shlink-svc.loadbalancer.server.port=8080"
      ## Homepage
      # - homepage.name=Snapp
      # - homepage.group=Other
      # - homepage.icon=https://raw.githubusercontent.com/dullage/flatnotes/master/flatnotes/src/assets/android-chrome-512x512.png
      # - homepage.href=https://snapp.$DOMAINNAME
    restart: always
    depends_on:
      - shlinkdb

  shlink-web-client:
    image: shlinkio/shlink-web-client
    container_name: Shlink-Web
    environment:
        - SHLINK_SERVER_API_KEY=$SHLINK_API_KEY
        - SHLINK_SERVER_URL=https://shorturl.$DOMAINNAME
    ports:
        - 57010:80
    networks:
      pihole:
        ipv4_address: '172.22.0.111'
      isolated:
    labels:
      - autoheal=true
      - "traefik.enable=true"
      ## HTTP Routers
      - "traefik.http.routers.shlinkweb-rtr.entrypoints=https"
      - "traefik.http.routers.shlinkweb-rtr.rule=Host(`shorturlweb.$DOMAINNAME`)"
      ## Middlewares
      - "traefik.http.routers.shlinkweb-rtr.middlewares=chain-no-auth@file" # No Authentication
      # - "traefik.http.routers.shlinkweb-rtr.middlewares=chain-basic-auth@file" # Basic Authentication
      # - "traefik.http.routers.shlinkweb-rtr.middlewares=chain-oauth-admins@file" # Keycloak
      ## HTTP Services
      - "traefik.http.routers.shlinkweb-rtr.service=shlinkweb-svc"
      - "traefik.http.services.shlinkweb-svc.loadbalancer.server.port=80"
      ## Homepage
      # - homepage.name=Snapp
      # - homepage.group=Other
      # - homepage.icon=https://raw.githubusercontent.com/dullage/flatnotes/master/flatnotes/src/assets/android-chrome-512x512.png
      # - homepage.href=https://snapp.$DOMAINNAME
    restart: always

  shlinkdb:
    image: linuxserver/mariadb
    container_name: Shlink-DB
    networks:
      - isolated
    expose:
      - "3306"
    environment:
      - PUID=$PUID
      - PGID=$PGID
      - TZ=$TZ
      - MYSQL_DATABASE=$SHLINK_DATABASE
      - MYSQL_USER=$SHLINK_DB_USER
      - MYSQL_PASSWORD=$SHLINK_DB_PWD
      - MYSQL_ROOT_PASSWORD=$SHLINK_DB_ROOT_PASSWORD
    logging:
      driver: "local"
      options:
        max-size: 10m
        max-file: "3"
    volumes:
      - $USERDIR/Shlink/DB:/config
    healthcheck:
      test: ["CMD", "mysqladmin", "ping", "--silent"]
      interval: 30s
      timeout: 1s
      retries: 5
    labels:
      - backup
      - autoheal=true
    restart: always

[acelaya]

People has struggled with traefik + Shlink in the past. Perhaps you can find something by searching for "traefik" in old issues and discussions.

The main problems are usually caused by CORS. Shlink automatically generates proper CORS headers as long as the request contains the Origin header. If traefik is not passing that header to Shlink, the browser will reject making API calls to Shlink.

The same could happen if traefik does forward the Origin header, but then strips out all CORS headers from the response.

In both cases, you should see some errors in the browser's console.

You can check some of these troubleshooting topics to get more info:

• https://shlink.io/documentation/troubleshooting/#shlink-cannot-be-accessed-from-shlink-web-client-or-other-web-clients
• https://shlink.io/documentation/troubleshooting/#response-to-preflight-request-doesnt-pass-access-control-check-no-access-control-allow-origin-header-is-present

It could also be that traefik is not forwarding API requests to Shlink at all, for some other mis-configuration. The logs you shared do not reflect any request reaching Shlink other than GET / 404 979, which is suspicious. At least pre-flight OPTIONS requests should be seen there.