The redirection was unsuccessful v3.3.2

Traefik Traefik v3 (latest)
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1

I want to use traefik to implement redirect with domain replacement, but the configuration has not been effective yet

      - traefik.enable=true
      - traefik.http.routers.headscale.rule=Host(`headscale-test.cloud.com`)
      - "traefik.http.routers.headscale.entrypoints=web"
      - "traefik.http.middlewares.sslheader.headers.customResponseHeaders.Content-Security-Policy-Report-Only=upgrade-insecure-requests"
      - "traefik.http.middlewares.sslheader.headers.customrequestheaders.X-Forwarded-Proto=https,wss"
      - "traefik.http.middlewares.sslheader.headers.customrequestheaders.Connection=upgrade"
      - "traefik.http.routers.headscale.middlewares=sslheader,headscale-redirectregex"
      - "traefik.http.middlewares.headscale-redirectregex.redirectregex.permanent=true"
      - "traefik.http.middlewares.headscale-redirectregex.redirectregex.regex=^https://headscale-test.cloud.com/register/(.*)"
      - "traefik.http.middlewares.headscale-redirectregex.redirectregex.replacement=https://p2pvpn-test.cloud.com/register/$${1}"
2

I changed HTTPS to HTTP and it worked, why

3

You original config seems strange. You listen on "web" entrypoint, but want to match in middleware the request URL with "https". That should never work.