Is it the right fix?

     ylavic: don't we know from the very beginning of store_body() if

             r->connection->aborted, so to fail there?

     rpluem: Agreed. I guess we can move this up to line 733 before the loop.

     ylavic: Or even at the beginning if we want to avoid file caching too.

             But finally I wonder why we would not cache the response provided

             it is complete. Shouldn't incomplete response be detected with

             error buckets instead? ISTM that EOS with no error bucket *is*

             a complete response that could be cached even if the current

             client won't receive it completely.

  *) mod_proxy: don't recyle backend announced "Connection: close" connections

     to avoid reusing it should the close be effective after some new request