Header seems missing when proxying Transmission

[devster31]

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

Bug I presume.

What did you do?

I'm trying to proxy transmission.

What did you expect to see?

The transmission WEB UI.

What did you see instead?

I got back a webpage with the following:

409: Conflict
Your request had an invalid session-id header.

To fix this, follow these steps:

1. When reading a response, get its X-Transmission-Session-Id header and remember it
2. Add the updated header to your outgoing requests
3. When you get this 409 error message, resend your request with the updated header

This requirement has been added to help prevent CSRF attacks.
X-Transmission-Session-Id: <SessionID>

I'm a bit stumped, where could this come from?

Output of traefik version:

Version:      v1.5.3
Codename:     cancoillotte
Go version:   go1.9.4
Built:        2018-02-27_02:47:04PM
OS/Arch:      linux/arm

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

version: '3.3'
services:
  traefik:
    command:
      # - --debug
      - --loglevel=INFO
      - --defaultentrypoints=http,https
      - --entryPoints=Name:http Address::80 Redirect.EntryPoint:https
      - --entryPoints=Name:https Address::443 Compress:true
          TLS:/certs/${DOMAIN}.crt,/certs/${DOMAIN}.key TLS.MinVersion:VersionTLS12
          TLS.CipherSuites:["TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305","TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256","TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384","TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256","TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256"]
      - --entryPoints=Name:api Address::8080
      - --api.entrypoint=api
      - --acme=true
      - --acme.acmelogging=true
      - --acme.email=${EMAIL}
      - --acme.domains=${DOMAIN}
      - --acme.storage=/etc/traefik/acme.json
      - --acme.entrypoint=https
      - --acme.onhostrule=true
      - --acme.dnschallenge=true
      - --acme.dnschallenge.provider=cloudflare
      - --acme.tlsconfig=true
      - --docker=true
      - --docker.debugloggeneratedtemplate=true
      - --docker.domain='${DOMAIN}'
      - --docker.exposedbydefault=false
      - --docker.usebindportip=true
      - --docker.watch=true
      - --file=true
      - --file.filename=/etc/traefik/external.toml
      - --file.watch=true

And the external.toml file:

[backends.transmission.servers.server0]
url = "http://<username>:<password>@<docker_IP>:9091"

[frontends]
  [frontends.transmission]
  backend = "transmission"
  passHostHeader = true
    [frontends.transmission.routes.route1]
    rule = "Host:alioth.ovh,rpi3.local;PathPrefix:/transmission,/transmission/"

[traefiker]

Hi! I'm Træfiker 🤖 the bot in charge of communication regulation.

Thanks for your interest in Træfik!

We dedicate the issue tracker to bug reports and feature requests only.

If you have questions and need community support, you can join our Slack workspace and reach out to us on the #support channel.

Another option is to use Stack Overflow and tag your question traefik.

Of course, double checking Træfik's documentation is always a good idea 😅

[jkaberg]

@idez would you mind opening again?

So this issue stems from Transmission setting an Response Header (eg: x-transmission-session-id: <random upper/lowercase numerical string>), wheres it expect to get this very same Header and value as an Request Header upon new request.

I tried looking over the documentation however I can't seem to find if this is currently doable, eg. passing (and not adding/removing/modifing) headers.

[devster31]

The only thing I found is the stickiness option which also provides stickiness.cookieName but not a Header version.