mod_proxy_http: Don't expect the backend to ack the "Connection: close" to finally close those not meant to be kept alive by SetEnv proxy-nokeepalive or force-proxy-request-1.0, and respond with 502 instead of 400 if its Connection header is invalid.
Merge r1619383, r1619444, r1662245, r1662246 from trunk:
A misplaced check for inflation limits prevented limiting relatively small inputs. PR56872
Submitted By: Edward Lu Committed By: covener
mod_deflate: follow up to r1619383.
deflate_in_filter(): - use inflated bytes per inflate() call to compute the total output bytes, - check zlib errors before limits, - add missing check_ratio() when asked to flush.
deflate_out_filter(): - check ratio after each inflate() call.
mod_deflate: follow up to r1619383 and r1619444: CHANGES entry.
CHANGES: follow up to r1662245: Add PR number. Submitted by: covener, ylavic, ylavic, ylavic Reviewed/backported by: jim