Custom headers are not applied with docker

[talolard]

Related to #2028 #2030

Do you want to request a feature or report a bug?

Bug

What did you do?

I'm using Traefik v1.51 on docker swarm mode.
I launch it as a service with the following command

docker service create \
    --name traefik \
    --constraint=node.role==manager \
    --publish 80:80 --publish 8080:8080 --publish 443:80\
    --mount type=bind,source=/var/run/docker.sock,target=/var/run/docker.sock \
    --network traefik-net \
    --label com.docker.aws.lb.arn="arn:aws:acm:us-east-1:052831428797:certificate/ef25f821-f311-4b29-99e7-099ab624aa99" \
    traefik \
    --docker \
    --docker.swarmmode \
    --docker.domain=traefik \
    --docker.watch \
    --web

I launch a stack with the following compose file

version: '3'

services:
    frontend:
        image: my_image
        networks:
            - traefik-net
        deploy:
            labels:
                 - "traefik.port=5000"
                 - "traefik.docker.network=traefik-net"
                 - "traefik.frontend.rule=Host:test.lighttag.io"
                 - "traefik.frontend.headers.customresponseheaders=X-Testing-1:544"
networks:
    traefik-net:
        external: true

What did you expect to see?

When I do
curl -i -v http://nlph.lighttag.io
I expect the header X-Testing-1:544 to be returned

What did you see instead?

curl -i -v   http://test.lighttag.io 
* Rebuilt URL to: http://test.lighttag.io/
*   Trying my_ip ...
* Connected to test.lighttag.io (my_ip) port 80 (#0)
> GET / HTTP/1.1
> Host: test.lighttag.io
> User-Agent: curl/7.47.0
> Accept: */*
> 
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< Accept-Ranges: bytes
Accept-Ranges: bytes
< Cache-Control: public, max-age=0
Cache-Control: public, max-age=0
< Content-Length: 724
Content-Length: 724
< Content-Type: text/html; charset=utf-8
Content-Type: text/html; charset=utf-8
< Date: Fri, 09 Feb 2018 14:45:40 GMT
Date: Fri, 09 Feb 2018 14:45:40 GMT
< Etag: W/"2d4-16179f127d8"
Etag: W/"2d4-16179f127d8"
< Last-Modified: Fri, 09 Feb 2018 09:41:43 GMT
Last-Modified: Fri, 09 Feb 2018 09:41:43 GMT
< Vary: Accept-Encoding
Vary: Accept-Encoding

Output of traefik version: (What version of Traefik are you using?)

~ $ docker run traefik version
Version:      v1.5.1
Codename:     cancoillotte
Go version:   go1.9.3
Built:        2018-01-29_02:14:02PM
OS/Arch:      linux/amd64

What is your environment & configuration (arguments, toml, provider, platform, ...)?

Default traefik container.

[ldez]

Thanks for your interest in Traefik 😃

The labels are case sensitive, you must use traefik.frontend.headers.customResponseHeaders=EXPR

http://docs.traefik.io/configuration/backends/docker/#security-headers

[talolard]

Thanks for that amazingly fast response