PR53420: Proxy responses with error status and
"ProxyErrorOverride On" hang until proxy timeout.

Regression from 2.2. It was introduced by r912063
in order to fix PR41646.


Switch preference for headers, Transfer-Encoding
first, Content-Length second.

Addition to r1615289.

Submitted by: rjung
Reviewed/backported by: jim


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Turn some APR_BUCKET_REMOVE(e)+apr_bucket_destroy(e) into the equivalent apr_bucket_delete(e) to reduce code verbosity

Submitted by: jailletc36
Reviewed/backported by: jim


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instead of linker def file due to bug with mwldnlm linker
where patch version > 26 is ignored from def file.


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part of the trailers fix 


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Make up-to-date

Reviewed/backported by: jim


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core: HTTP trailers could be used to replace HTTP headers
late during request processing, potentially undoing or
otherwise confusing modules that examined or modified
request headers earlier.  Adds "MergeTrailers" directive to restore
legacy behavior.

Submitted by: Edward Lu, Yann Ylavic, Joe Orton, Eric Covener
Backports: r1610814
Reviewed by: covener, wrowe, ylavic



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propose deflate tweak


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no status during if_walk



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call out some variables that aren't set during <if>



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two commenters were confused authnprovideralias 
providing special config to authz providers



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