'502 Bad Gateway' caused by: EOF

Traefik Traefik v2
1

I have an app that is serving API requests. Due to some long processes, the time taken for the application to respond is around 70 secs, but somehow traefik return response of 502 gateway error 10 seconds earlier.

version: '3.7'
services:
  web_server:
    image: traefik:v2.2
    restart: always
    ports:
      - "80:80"
      - "443:443"
      - "8080:8080"
    command: 
      - "--providers.docker=true"
      - "--accesslog=true"
      - "--api.insecure=true"
      - "--log.level=DEBUG"
      - "--api.dashboard=true"
      - "--entrypoints.web.address=:80"
      - "--entrypoints.websecure.address=:443"
      - "--entrypoints.websecure.transport.respondingtimeouts.writetimeout=240"
      - "--entrypoints.websecure.transport.respondingtimeouts.idletimeout=240"
      - "--entrypoints.websecure.transport.respondingtimeouts.readtimeout=240"
      - "--serverstransport.forwardingtimeouts.responseheadertimeout=240"
      - "--serverstransport.forwardingtimeouts.idleconntimeout=240"
      - "--serverstransport.forwardingtimeouts.dialtimeout=240"
      - "--providers.docker.network=network_default"
      # - "--entrypoints.web.http.redirections.entrypoint.to=websecure"
      - "--certificatesresolvers.cosec.acme.httpchallenge=true"
      - "--certificatesresolvers.cosec.acme.httpchallenge.entrypoint=web"
      - "--certificatesresolvers.cosec.acme.email=xxx@example.com"
      - "--certificatesresolvers.cosec.acme.storage=/data/acme.json"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - traefik_data:/data
      # - /dev/null:/traefik.toml
    stop_grace_period: 120s
    deploy:
      update_config:
        order: start-first
    logging:
      driver: "json-file"
      options:
          max-file: 5
          max-size: 10m
1 Like
2

To me that sounds like the endpoint is terminating the connection. Maybe turn logging to DEBUG to see if there is more information to be gleaned from Traefik.