Rate limiter source extractor header name handling of requests without the header name about traefik HOT 1 OPEN

Hello @arendhummeling ,

thank for your interest in Traefik.
If I understood correctly, you aim to return a 401 when the header name is not present (return by your backend I guess).
I can suggest you a workaround. You can define 2 routes like this:

http:
  routers:
    RouterWithRatelimit:
      entryPoints:
        - web
      middlewares:
        - rate-limit
      service: myBackend
      rule: Host(`example.com`) && HeaderRegexp(`Api-Key`, `^.+$`)

    RouterWithOutRatelimit:
      entryPoints:
        - web
      service: myBackend
      rule: Host(`example.com`)

By using https://doc.traefik.io/traefik/v3.0/routing/routers/#header-and-headerregexp, only request that contains the header is ratelimited.

Still, we are interested in this issue, but we’re unsure about the use case and the traction it will receive. We are going to leave the status as kind/proposal to give the community time to let us know if they would like this idea.

We will reevaluate as people respond.

If you or another community member would like to build it before that happens, let us know, and we will work with you to make sure you have all the information needed.
Let us know here before you start. We prefer to work with our community members at the beginning of the design process to ensure that we are aligned and can move quickly with the review and merge process.

from traefik.