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Synch with 2.4.x and imporve syntax highlight

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Re: [Bug 62318] healthcheck

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When a rewrite to proxy is configured in the server config, a check is made to make sure mod_proxy is active.  But the same is not done if a rewrite to proxy is configured in an .htaccess file. 

Basically this patch is the block of code from hook_uri2file that does the proxy check, copied to hook_fixup.

Patch provided by Michael Streeter [mstreeter1 gmail.com], slightly modified to use a new APLOGNO

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There is no need to copy, strchr, strcmp and modify a string which is only used for TRACE2 logging.

Note that the code that looks similar a few lines below can not be optimized the same way because it is also returned in 'pmessage'.

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- Remove the space in "character set" in the syntax of ProxyFtpDirCharset to avoid confusion (it is 1 parameter only)
- Use the correct syntax for the "default" values, so that they are parsed and correctly displayed in 'quickreference'
- Remove extra [] when directive's parameter are required

- correct the default password: apache-proxy@ instead of apache_proxy@.
This was silently changed in r88745, 17 years ago!

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Remove some dead code. '!r->content_languages' is known to be true at this point.

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Remove some dead code. Updating 'last' is pointless here.

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'ap_unescape_urlencoded()' suggests that NULL can be passed to 'unescape_url()'.
So avoid a potential 'strchr(NULL, ...)' which is an undefined behavior.

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.. to allow ucnonfigured hostnames to be rejected. 

The checks happen during NVH mapping and checks that the
mapped VH itself has the host as a name or alias.



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it breaks the build w/ maintainer mode.


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Itself won't yield at this point (its f->bb is empty).


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Since previous output filters may use ap_filter_should_yield() to determine
whether they should send more data (e.g. ap_request_core_filter), we need
to flush pending data from the core output filter first, and so on up the
chain.

Otherwise we may enter an infinite loop where ap_request_core_filter() does
nothing on ap_filter_output_pending() called from MPM event.


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processes in the "cu" and "cs" values.
Add CPU time of the parent process to the
"c" and "s" values.


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in milliseconds.


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MPMs in "auto" mode.  Added number of processes,
number of stopping processes and number
of busy and idle workers.


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in mod_status when "ProxyStatus" is "On":
add "busy" count and show byte counts in auto
mode always in units of kilobytes.


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Follow up to r1833368 and r1833452.


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s/addoutputfilter/add_output_filter/
See PR 62359

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There is no need to check the first bytes, they are known to be "bytes ".

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mod_md: When the last domain name from an MD is moved to another one,
     that now empty MD gets moved to the store archive. PR 62572.


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If a signal is received early when the MPM children start, signal_threads() may
be called concurrently with start_streads() thus before the latter (or its
underlying threads like the listener_thread) had a chance to create and init
the queues, mutexes, pollset and sockets array used by the former.

So move those initializations to a new setup_threads_runtime() function called
before start_threads(), where the pruntime pool is also created.


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If ProxyPassReverse is used for reverse mapping of relative redirects, subsequent ProxyPassReverse statements, whether they are relative or absolute, may fail.

PR 60408 [Peter Haworth <pmh1wheel gmail.com>]

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