Background: https://bz.apache.org/bugzilla/show_bug.cgi?id=59838

This commit should be an improvement for http://svn.apache.org/r1752347, in which
I tried to resolve a long standing issue with mod_proxy_fcgi: when a FCGI backend
returns a response that will become a HTTP 304, mod_proxy_fcgi forces a break
in the request processing ending up in reading the remaining bytes (for example
the message-body) and trying to intepret them as a FCGI header. This would cause
a error and a weird behavior:
1) HTTP 304 response flushed to the client correctly.
2) HTTP 503 logged in the access_log plus other bogus errors in the error_log.
I tried to separate the behavior when connection reuse is set or not, to eliminate
unnecessary latency in the latter case (which is the default).

I tested the change with and without connection reuse successfully, but feedback is
really welcome. If nobody will have anything against it I'll then proceed to update
my 2.4.x backport proposal.



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Looking for someone with an EBCDIC environment to post the output of
the test_char.h generated file for verification.



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more efficient pass through the header text; rather than reparsing
the strings over and over under the HTTP_CONFORMANCE_STRICT fules.

Improve logic and legibility by eliminating multiple repetitive tests
of the STRICT flag, and simply reorder 'classic' behavior first and
this new parser second to simplify the diff. Because of the whitespace
change (which I had wished to dodge), reading this --ignore-all-space
is a whole lot easier. Particularly against 2.4.x branch, which is now
identical in the 'classic' logic flow. Both of which I'll share with dev@



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and ap_get_http_token for more efficient string handling.



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which has always defined 'token' as CHAR or VCHAR - visible USASCII only.

NUL char is also a stop, end of parsing.



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triggering mod_proxy_connect's AH01018 once the tunnel is established.
https://bugzilla.mozilla.org/show_bug.cgi?id=1279483



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the client when forwarding data from the backend to the client, not the
reverse.


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level ERR (resp. TRACE2), and name the backend connection "backend" instead of
"sock".


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versions more likely to work verbatim.



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This decoration is required for all apr_thread fn() entry points,
at least on some platforms.



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Submitted by: Hank Ibell <hwibell gmail.com>
Committed by: covener



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  number of redirects to the number balancer members.

PR: 59864


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  as in this case r->status might contain the true response code.

PR: 59869


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