Problem during HTTPS redirection

[nmengin]

Description

Traefik used with Docker Swarm cluster (not swarm mode).
HTTP automatically redirected to HTTPS.
URL malformed during Rediirection.

Steps to reproduce

Traefik configuration

defaultEntryPoints = ["http", "https"]
[entryPoints]
   [entryPoints.http]
   address = ":80"
     [entryPoints.http.redirect]
       entryPoint = "https"
  [entryPoints.https]
    address = ":443"
    [entryPoints.https.tls]
      [[entryPoints.https.tls.certificates]]
         CertFile = "/certs/traefik/cert.pem"
         KeyFile = "/certs/traefik/key.pem"

Traefik docker-compose file

services:
  traefik:
...
    image: myimages/traefik:1.1.0.2
...
    ports:
      - "443:443"
      - "80:80"
    command: --docker=true --docker.endpoint="tcp://mySwarmMger:3376" --docker.exposedbydefault=false --docker.domain="mydomain.io" --docker.tls=true --docker.tls.ca=/certs/docker/ca.pem --docker.tls.cert=/certs/docker/cert.pem --docker.tls.key=/certs/docker/key.pem
...

Apache docker-compose file

services:
  http:
    image: myimages/http
    hostname: http
    container_name: c_http
    expose:
     - "80"
     - "443"
    networks:
     - traefik
    labels:
      - "traefik.port=80"
      - "traefik.frontend.rule=Host:2_8_9.mydomain.io"
      - "traefik.enable=true"
      - "traefik.docker.network=traefik_net"

Curl command : http://2_8_9.mydomain.io/

Result

* STATE: INIT => CONNECT handle 0x600057340; line 1397 (connection #-5000)
* Added connection 0. The cache now contains 1 members
*   Trying 10.206.3.76...
* TCP_NODELAY set
* STATE: CONNECT => WAITCONNECT handle 0x600057340; line 1450 (connection #0)
* Connected to 2_8_9.mydomain.io (10.206.3.76) port 80 (#0)
* STATE: WAITCONNECT => SENDPROTOCONNECT handle 0x600057340; line 1557 (connection #0)
* Marked for [keep alive]: HTTP default
* STATE: SENDPROTOCONNECT => DO handle 0x600057340; line 1575 (connection #0)
>GET / HTTP/1.1
>Host: 2_8_9.mydomain.io
>User-Agent: curl/7.50.3
>Accept: */*
>
* STATE: DO => DO_DONE handle 0x600057340; line 1654 (connection #0)
* STATE: DO_DONE => WAITPERFORM handle 0x600057340; line 1781 (connection #0)
* STATE: WAITPERFORM => PERFORM handle 0x600057340; line 1791 (connection #0)
* HTTP 1.1 or later with persistent connection, pipelining supported
< HTTP/1.1 302 Found
< Location: https://2:443_8_9.mydomain.io/
< Date: Thu, 08 Dec 2016 13:58:04 GMT
< Content-Length: 5
< Content-Type: text/plain; charset=utf-8
<
* Ignoring the response-body
* multi_done
* Curl_http_done: called premature == 0
* Connection #0 to host 2_8_9.mydomain.io left intact
* Issue another request to this URL: 'https://2:443_8_9.mydomain.io/'
* STATE: PERFORM => CONNECT handle 0x600057340; line 1931 (connection #-5000)
* Added connection 1. The cache now contains 2 members
* getaddrinfo(3) failed for 2:443
* Couldn't resolve host '2'
* Closing connection 1
* The cache now contains 1 members
* Expire cleared
curl: (6) Couldn't resolve host '2'

Apparently there is a problem with '_' in URL.

[emilevauge]

Fixed by #947