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This commit is a follow up of r1802040 based on Jacob's
feedback, namely inserting the FLUSH buckets only when
really needed and useful, not always.



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mod_md: added necessary CPPFLAGS for a2md build.



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mod_md: v0.9.2: new directive 'MDHttpProxy' to define a proxy for outgoing connection,
some minor bugfixes, twiddle the build system to avoid non-pic code generation.



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mod_ssl: Extending SSLEngine to alternatively get a list of add:port spec as used in VirtualHost.



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used only if registered at init time (httpd.conf).

Calling ap_method_register() in children processes is not the right scope
since it won't be shared for all requests.


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mod_md: avoid linking libmd.la twice



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mod_md: fix in Makefile to use EXTRA_INCLUDES for a2md build, so that APR headers from srclib are found.



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  *) mod_md: v0.9.1:
     - various fixes in MDRenewWindow handling when specifying percent. Serialization changed. If 
       someone already used percent configurations, it is advised to change these to a new value,
       reload and change back to the wanted ones.
     - various fixes in handling of MDPrivateKeys when specifying 2048 bits (the default) explicitly.
     - mod_md version removed from top level md_store.json file. The store has its own format version
       to facilitate upgrades.
 


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Note it is related to PR  59007



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  *) mod_http2: DoS flow control protection is less agressive as long as active tasks stay
     below worker capacity. Intended to fix problems with media streaming. 



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mod_ssl: using improved mod_md md_get_certificate optional function when available


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mod_md: 
 * Improved interface to mod_ssl for fallback handling. Backward compatible to previous mod_ssl
   patch, but fallbacks will not work.
 * Provide a temporary, self-signed certificate with a speaking command and domain name if we
   have no other cert for a Managed Domain, yet. Refs github issue #32
 * Continue to provide expired or not-completely matching, existing certificate for a Managed
   Domain until the renewal was successful. This is helpful when one adds a DNS name to
   a MD, so the previous domains can be served while a new cert is requested.
 * All files necessary to run tests are not in the release package.
 * Making "http-01" the preferred challenge type again, as people "tls-sni-01" requires at least
   one working certificate vhost right now - which not everyone has.
 * moved part of the MD sanity checks from post_config to check_config phase, allowing for error
   detection in check-only runs.



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mod_md: v0.8.1 from github, new feats in CHANGES



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This commit is a follow up of r1805189, in which
a new logic was added to allow to repeat a directive
name only if its type is different (like SSLPolicy
and <SSLPolicy>). The change broken french translations
since the $this variable, containing the translated
sections, was not used anymore.

The XPath code could surely be improved, but it seems
more pressing to allow our translators to get back
to their daily work without interference.

build.sh validate-* worked fine, as well as the build.sh fr
translation.



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Style is not perfect, but at least, the warning is fixed.

warning: format ‘%c’ expects argument of type ‘int’, but argument 10 has type ‘long unsigned int’ [-Wformat=]

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