bug#42548: Cuirass 504 errors

[Mathieu Othacehe]

> And does it mess Cuirass if the connection is lost e.g. down the
> network?

Not sure yet, I also found this message:

--8<---------------cut here---------------start------------->8---
Uncaught exception in fiber ##f:
In ice-9/boot-9.scm:
  1736:10  5 (with-exception-handler _ _ #:unwind? _ # _)
In web/server/fiberized.scm:
   160:26  4 (_)
In ice-9/suspendable-ports.scm:
     83:4  3 (write-bytes #<closed: file 7ff11c2dec40> #vu8(60 33 ?) ?)
In unknown file:
           2 (port-write #<closed: file 7ff11c2dec40> #vu8(60 33 # ?) ?)
In ice-9/boot-9.scm:
  1669:16  1 (raise-exception _ #:continuable? _)
  1669:16  0 (raise-exception _ #:continuable? _)
ice-9/boot-9.scm:1669:16: In procedure raise-exception:
In procedure fport_write: Broken pipe
--8<---------------cut here---------------end--------------->8---

that suggests that we try to write something to a closed file.

To be investigated :)

Mathieu