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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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In trunk: r1611210 , r1611252, r1611481, r1611919

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Silence compiler warning:
mod_authnz_fcgi.c:580:44: warning: 'orspbuflen'
may be used uninitialized in this function.

Not true but annoying.


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