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mod_ratelimit: fix behavior with proxied content

mod_ratelimit works by splitting data in "chunks"
to send to the client, sleeping a predefined amount
of time between them (200ms). So for example,
a rate-limit 40 value would correspond to a chunk size
of 8192 bytes, flushed to the client every 200ms.

The idea works fine when httpd directly serves the
content, since the filter will be called once with
a single bucket brigade. In the context of a proxied
content though the filter is likely to be called multiple
times, with a bucket brigade size that corresponds to
the maximum allowed buffer size. If this value is lower
or higher than the chunk size, the filter will not
properly rate limit the data going to the client.

This patch solves the problem with two fix:
1) do_sleep is now stored in the ctx context struct,
   so if the filter is invoked multiple times it
   will still sleep when needed. For example, say
   that the chunk_size is 8192 and the bucket brigate
   len is 10240: the filter will flush 8192 bytes
   on the first invocation, sleep 200ms, flush the
   remaining bytes and then finish. The next invocation
   will do the same, clearly not leading to the
   correct "sleeping pattern".
2) The example above highlights also another issue:
   mod_ratelimit should  flush only chunk_size bytes
   at the time (I am now excluding the burst calculation
   from the picture), and buffer between invocations
   unless the brigade contains EOS.

The change has been tested with various scenarios and
it looks working as expected, but of course more
feedback/testing is welcome.

The original patch was written by me and then Yann
refactored the code to be more precise and efficient,
basically transforming an axe in a wonderful Japanese
katana sword, so credits to him for this work.

PR: 62362


Submitted by: elukey
Reviewed by: elukey, jim, ylavic


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Re-allow '_' (underscore) in hostnames.

'_' was not permitted in hostnames since 2.4.25's "HTTP Strict"
changes.




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  *) mod_slotmem_shm: Add generation number to shm filename to fix races with
                      graceful restarts.  PRs 62044 and 62308.
     trunk patch: https://svn.apache.org/r1831868
                  https://svn.apache.org/r1831869
                  https://svn.apache.org/r1831870
                  https://svn.apache.org/r1831871
                  https://svn.apache.org/r1831872
                  https://svn.apache.org/r1831935
                  https://svn.apache.org/r1831938
                  https://svn.apache.org/r1832479
     2.4.x patch: http://home.apache.org/~ylavic/patches/httpd-2.4.x-balancer_slotmem-v2.patch
     +1: ylavic, jim, druggeri

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Remove empty line.

* modules/ssl/ssl_util.c (ssl_util_vhostid): Simplify code,
  no functional change.


Save a few cycles and simlify code.

Use apr_pstrmemdup instead of apr_pstrndup when possible.
Avoid scanning the first 2 bytes when looking for the | delimiter. it is known to be "${".
Avoid comma separated statements, it is not that usual.

Save a few cycles.

Use apr_pstrmemdup instead of apr_pstrndup when possible.

* modules/proxy/mod_proxy_hcheck.c (sctx_t, hc_create_config):
  Remove unused bucket allocator created off pconf.
  Tag the subpool.

Submitted by: jailletc36, jorton, jailletc36, jailletc36, jorton
Reviewed by: jailletc36, covener, jim


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Russian translations of errordocs.
Contributed by Alexander Gaganashvili.


Error page translations submitted for zh-cn and zh-tw, contributed
by CodeingBoy <codeingboy gmail.com>.

Note that zh-tw is not a native translation; each translation aught
be reviewed by a native reader before backporting to 2.4.x branch.


Submitted by: niq, wrowe
Reviewed by: jailletc36, covener, jim


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Russian translations of errordocs.
Contributed by Alexander Gaganashvili.


Error page translations submitted for zh-cn and zh-tw, contributed
by CodeingBoy <codeingboy gmail.com>.

Note that zh-tw is not a native translation; each translation aught
be reviewed by a native reader before backporting to 2.4.x branch.


Submitted by: niq, wrowe
Reviewed by: jailletc36, covener, jim


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r1828478 was already partially backported.

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(1828478 in trunk)

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backport of current mod_md version and documentation.



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While reading PR 62422 I noticed that ProxySet's available
contextes list only 'directory', that looks odd:

AP_INIT_RAW_ARGS("ProxySet", set_proxy_param, NULL, RSRC_CONF|ACCESS_CONF



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Add default schema ports for websockets

Nore userland/PR change

PR: 62480
Submitted by: Lubos Uhliarik <luhliari redhat.com>
Reviewed by: jim, rpluem, covener


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