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tweaks to grammar and markup


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Merge r1588747 from trunk:

expr=value updates:
 update RequestHeader syntax, 
 add compat to Header and RequestHeader




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Also clear the error queue before calling SSL_CTX_use_certificate[_chain]_file
(workaround for OpenSSL versions before 0.9.8h, see
https://rt.openssl.org/Ticket/Display.html?user=guest&pass=guest&id=1513).

PR 56410.

Submitted by: kbrand
Reviewed/backported by: jim


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  *) mod_proxy_wstunnel: Don't pool backend websockets connections,
     because we need to handshake every time. PR 55890.
     [Eric Covener]



actually remove mod_reqtimeout, since the util_filter functions involved
only manipulate c->input_filters no matter what we pass. We need to make
copies of c->input_filters after, not before, it skips over reqtimeout.

Note: reqtimeout doesn't really interfere today with normal operation,
but this is misleading/confusing when dealing with other
wstunnel issues.



cleanup wstunnel error handling

Submitted By: covener, ylavic, Edward Lu
Commited By: covener



followup to r1587036.

if backend->close is set too early, proxy_util.c will close it right 
away and then blow away the field.

Submitted by: covener
Reviewed/backported by: jim


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Correct logic... if this is a UDS socket, then bypass all
this.

make mod_rewrite and mod_proxy UDS work together...

Adjust url as required, following what we did to r->filename.
Save some cycles when searching...

Tuck away UDS path in request-rec, since worker isn't
thread-safe. Protect from NULL refs.

Reflow logic... pull UDS stuff out

handle leak. thx to Y^2

r->filename should maintain the proxy: prefix for PHP-FPM
Reviewed/backported by: jim


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follow-up to r813376:

finish reverting r808965 (ServerTokens set foo)


tweak syntax strings for ServerTokens
Submitted by: trawick
Reviewed/backported by: jim


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Follow-up to r1546759: Fix compilation when exception hooks aren't enabled.


avoid duplication of APR_HOOK_LINK invocations

Submitted by: trawick
Reviewed/backported by: jim


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