returned according to {output,backend}_failed. So the clarification is
possibly as simple as renaming output_failed => client_failed (r1674056 added
above), WDYT?
+ trawick: It still looks to me that an error with ap_pass_brigade (towards
+ client) can turn into a 400 error, which is what I was concerned
+ about originally.
*) http: Don't remove the Content-Length of zero from a HEAD response if
it comes from an origin server, module or script. Allow the previous