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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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backported


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add server_rec to log.c fatal startup errors

Not strictly necessary for trunk, but in 2.4.x if the main ErrorLog is
using syslog, these messages are lost.  In trunk, the low-level logging
routines reach up and find the syslog provider when no server_rec is provided
but that backport is stalled.





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