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Clear retry flags before aborting on client-initiated reneg.

PR: 63052
Backports: r1850946
Submitted by: Joe Orton
Reviewed by: wrowe, jorton, rpluem


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per https://tools.ietf.org/html/rfc7231#section-3.1.3.1  

PR: 39730
Backports: r1850989
Submitted by: jailletc36
Reviewed by: jailletc36, wrowe, jim



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Backport r1850947 from trunk
Submitted by: hwibell
Reviewed by: hwibell, covener, wrowe


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mod_http2: change in cleanup strategy for slave connections.



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Improve syntax highlight and hyper-links.
(r1851152 in trunk)

s/authorisation/authorization/ to be consitent
(r1516864 in trunk)

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Synch a bit with trunk

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+ fix a typo to synch with trunk

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(r1850545 in trunk)

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(r1850539 in trunk)

+ remove a trailing space to synch with trunk

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Backport of r1850098 from trunk.


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  *) mod_md: incorrect behaviour when synchronizing ongoing ACME challenges
     have been fixed. [Michael Kaufmann, Stefan Eissing]



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I only tested, added a test case and proposed for backport.

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core: Fix incorrect substitution of env vars in directives containing multiple env vars.

In ap_resolve_env(), the string returned from getenv() should be copied since
the returned string may be statically allocated.

This fixes an issue where the value for the last env var is substituted for all
env vars in a directive containing multiple env vars.

Submitted by: hwibell
Reviewed by: hwibell, covener, jim


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