Can I disable HTTP/2 in Traefik and just use HTTP/1.1?
reads your mind
Because I'm facing a showstopper bug of doom where one Chrome or Chromium request will stall for over 59 seconds (but not quite a minute!) before closing the HTTP/2 session and trying to fetch a resource again (unless it is requested via requireJS, which will cancel the thing after umpteen seconds). The problem does not happen if we start Chrome or Chromium with the --disable-http2 argument. It also does not happen in the same application hosted in a different (testing) environment that does not support HTTP/2 (using a NodeJS-based proxy specifically).
There are other variables at play. I'm not convinced that disabling HTTP/2 will workaround the problem, but telling Traefik to pretend that it can only do HTTP/1.1 seems like an easy thing to try.
No you can't without altering source code.