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Modifying the number of proxy balancers or balancer members on restart
could have prevented the server to load, notably on Windows.  PR 62308.

The generation number integrated in the SHM filename allows to create a
new/resized SHM while the previous is still in use by previous generation
gracefully shutting down (Windows prevents SHM/file to be removed in this
case, but even on Unix(es) an unlinked file might not be re-openable while
an inode exists). The generation number is added/incremented only if the
size requirement changed, such that unrelated restarts continue to share
SHMs between generations.

The cleanup handling is also simplified because both the parent process and
the Windows child process need to cleanup everything on exit. This translates
to cleanup_slotmem() being always registered but in the dry load state
(AP_SQ_MS_CREATE_PRE_CONFIG), for both cases still.



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  config_vars.mk.


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  for a DSO build.


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Proposed by: Ewald Dieterich <ewald mailbox.org>
Reviewed by: ylavic



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Also adds a comment and a CHANGES entry.


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mod_http2: restoring the v1.10.16 keepalive timeout behavioud of mod_http2 (to be verified).



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mod_http2: adding an abort function to slave connections' pools, so out-of-memory
     events lead to a control process abort, as on HTTP/1.x connections.



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Use below pending_data logic for EOS bucket.
This closes #48


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mod_http2: adding regular memory cleanup when transferring large response bodies. This
     reduces memory footprint and avoids memory exhaustion when transferring large files
     on 32-bit architectures. Fixes PR 62325. 



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We already know the length of the string we want to copy, so use 'apr_pstrmemdup()' instead of 'apr_strdup()'.

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Rename ap_fgetline_impl() to ap_fgetline_core(), and do missing EBCDIC
translation in ap_fgetline().

Also restore EBCDIC translation for ap_getline(), as noted by Ruediger this
was changed (unexpectedly) in r1829659.



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This will make it easier to compare with an extraclean jdk9 



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 - more consistently refer to the filters declared via the harness as
   "smart filters"
 - reinforce that the providers are traditional filters.
 - drop some info about the optional type parameter
 - elaborate on examples



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Use the "c" highlight for API description.

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If this handler will not handle the request, no need to waste bytes in the request pool.

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It allows to read a line directly from an input filter, in blocking mode
or not. Since no request_rec is needed, a pool may be given.

Existing ap_[r]getline() function are now based off ap_fgetline() by calling:
    ap_fgetline(s, n, read, r->proto_input_filters, flags, bb, r->pool);

Will follow up with a new ap_get_mime_headers_*() flavor which can be used by
any filter that needs non-blocking and not necessarily has a request_rec (e.g.
ap_http_filter() to read proxied response trailers).



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1829659 13f79535-47bb-0310-9956-ffa450edef68

Keep using ap_rgetline() as before r1829573, since ap_rgetline_core() is
EBCDIC agnostic.



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We still need them when folding, other than AP_GETLINE_FOLD itself of course.



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ResponseFieldSize actually applies to headers (not body), so the comment was
valid but did match the code (addressed by r1829642 still).



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If f->r->proxyreq is PROXYREQ_PROXY or PROXYREQ_REVERSE in ap_http_filter(),
we are still handling the request, not the response where LimitRequestBody
does not apply.



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Fix the number of available load balancer scheduler algorithms and add a link to the corresponding module. (lbmethod_heartbeat was missing in the list)

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Fixes response header thrown away after the previous one was considered too
large and truncated.

PR 62196.



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This tells the ap_getline() family of functions to consume the end of line
when the buffer is exhausted.

PR 62198.



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  for a vhost if SSLEnable is not used and no certs are configured,
  even if the Listen protocol is "https".  Restores behaviour to that
  prior to r1809303 for configs which would now otherwise fail at
  startup.


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