allow forwarded headers from external reverse-proxy (#1548)

Author: sanderegg

services/docker-compose.yml

@@ -240,7 +240,9 @@ services:
       - "--entryPoints.metrics.address=:8082"
       - "--metrics.prometheus.entryPoint=metrics"
       - "--entryPoints.http.address=:80"
+      - "--entryPoints.http.forwardedHeaders.insecure"
       - "--entryPoints.traefik_monitor.address=:8080"
+      - "--entryPoints.traefik_monitor.forwardedHeaders.insecure"
       - "--providers.docker.endpoint=unix:///var/run/docker.sock"
       - "--providers.docker.network=${SWARM_STACK_NAME}_default"
       - "--providers.docker.swarmMode=true"