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new directive H2Push on/off to en-/disable HTTP/2 server pushes. Server pushes are recognized by Link: headers in responses that carry the rel=preload parameter

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followup to r1713887


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refactored connection io handling to go for blocking reads more often and use h2_mplx access less frequently

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eliminating some compiler warnings on win32/win64, removing frame data size callback as it seems to have confused output streaming

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+ some minor style issues
+ split long lines

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The 'override_list' table is allocated from the cmd->pool, just as all strings from argv[].
So there is no need to duplicate them.

+ some minor style issues

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rework of output handling on stream/session close, rework of cleartext (http:) output to pass buckets to core filters, splitting of stream/io memory pools for stability and less sync

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We can do this in a single (no inner) loop, and simplify again the logic.


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staple responses with certificate status "good". Also avoids including
inaccurate responses when the OCSP responder is not completely up
to date in terms of the CA-issued certificates (and provides interim
"unknown" or "extended revoked" [RFC 6960] status replies).

Log a certificate status other than "good" in stapling_check_response().

Propagate the "ok" status from stapling_check_response() back via both
stapling_renew_response() and get_and_check_cached_response() to the
callback code in stapling_cb(), enabling the decision whether to include
or skip the response.


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when starting httpd as single process (httpd -X).


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inserting needed flush buckets on master connections again, rewrite task queue for better mem usage and less copying

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   #rule
      A construct "#" is defined, similar to "*", for defining lists of
      elements. The full form is "<n>#<m>element" indicating at least
      <n> and at most <m> elements, each separated by one or more commas
      (",") and OPTIONAL linear white space (LWS). This makes the usual
      form of lists very easy; a rule such as
         ( *LWS element *( *LWS "," *LWS element ))
      can be shown as
         1#element

It also defines Linear White Space (LWS) as:
   LWS            = [CRLF] 1*( SP | HT )


The actual implementation only accepts SP (Space) and not HT (Horizontal Tab) when parsing cache related header fields (i.e. "Vary", "Cache-Control" and "Pragma")

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