calls to ap_mpm_query() must be deferred until after the register-hooks hook, since that's 
where the MPM registers its mpm-query hook


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* where needed, base on APR_VERSION_AT_LEAST() so we remember what this is about
* where not, axe


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  stricter checking of remote server certificates.

  (docs/manual/mod/mod_ssl.xml)
    Documentation of SSLProxyCheckPeerExpire and SSLProxyCheckPeerCN.

  (modules/proxy/mod_proxy_http.c)
    Set the hostname of the request URL as note on the connection.

  (modules/ssl/ssl_private.h)
    Add proxy_ssl_check_peer_expire and proxy_ssl_check_peer_cn fields to
    the SSLSrvConfigRec.

  (modules/ssl/ssl_engine_config.c)
    Directives stuff for SSLProxyCheckPeerExpire and SSLProxyCheckPeerCN.

  (modules/ssl/ssl_engine_io.c)
    Check whether the remote servers certificate is expired / if there is a
    mismatch between the requested hostanme and the remote server certificates
    CN field.
    Be able to parse ASN1 times.

  (modules/ssl/mod_ssl.c)
    Directives stuff for SSLProxyCheckPeerExpire and SSLProxyCheckPeerCN.


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. ap_mpm_query() can return APR_EGENERAL if called too early (for debugging a module)
. some hypothetical module which implements the mpm-query hook can bypass the MPM
  with APR_ENOTIMPL


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  makes no sense with loadable MPMs
axe the unnecessary MPM_DIR build variable
move the stray APACHE_SUBST(MPM_LIB) from configure.in to server/mpm/config.m4, where
  the other MPM_foos are handled


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When a script returns a no-body response code, pretend it was a HEAD
request so as to drop any body the script might erroneously generate.


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mention SIGQUIT/3 not being processed by the signal handler.  

SIGQUIT may unfortunately be a go-to signal for java users.



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consistency with existing APIs (e.g., slotmem)

don't bother changing the MMN, which doesn't reflect recent -dev changes anyway


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The watchdog has zero interval, leaving to the callback to determine the running loop.

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This allows to break the blocked callbacks

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     returns EINPROGRESS and a subsequent poll() returns only POLLERR.
     Observed on HP-UX. 



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the mpm_get_child_pid hook is unnecessary, as was the per-MPM MPM_CHILD_PID() macro which it replaced

axe this new hook, and use ap_get_scoreboard_process() instead


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Windows continues to specify this in the MPM, at least until someone
can separate out the MPM-specific bits.


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    (hb_server_sort): Use correct variables for sorting.

Noticed by: Rüdiger


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Now, dunno if that was intended, but at least allow to start the httpd

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  apu-config which is gone in APR 2.0.


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Translated by: Nilgün Belma Bugüner <nilgun belgeler.org>
Reviewed by:  Orhan Berent <berent belgeler.org>

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- Use brigade_write instead of immortal buckets that aren't immortal.
- Read HTTP status code from serf.
- Remove extra logging.


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Convert the 100ms timed callback to a single cleanup callback that is added
when the request is ready to finish. Basically works, though it has
some issues with flushing and closing the connection.


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