Troubleshooting incoming HTTP request to bypass S3 Cloud API calls?

I have a working Traefik v2 setup running on Docker that redirects web traffic to multiple internal containers and a couple of non-docker services. (I followed this excellent guide: https://www.smarthomebeginner.com/traefik-2-docker-tutorial/)

I would like to identify which headers I can use to bypass my MFA middleware when making S3 calls to a private cloud storage service (Minio in this case).

I've enabled debug but all the logs show me is a middleware redirect. Is there anyway to inspect the incoming HTTP calls please?

Failing that, does anyone know which headers to configure as a bypass when using AWS Access IDs with the S3 protocol please? I've tried the following with no luck unfortunately.

http:
  routers:
    minio-rtr-bypass:
      rule: "Host(`s3.example.com`) && (HeadersRegexp(`AWSAccessKeyId`, `$AWS_ACCESS_KEY`))" 
      entryPoints:
        - https
      middlewares:
        - chain-no-auth
      service: minio-svc
      priority: 100

    minio-rtr:
      rule: "Host(`s3.example.com`)" 
      entryPoints:
        - https
      middlewares:
        - chain-authelia
      service: minio-svc
      priority: 99

  services:
    minio-svc:
      loadBalancer:
        servers:
          - url: "http://192.168.1.10:9000"

Many thanks.