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Simplify logic in check_pipeline(), and log unexpected errors.


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and consume them before the pipelining check to avoid possible response
delay when reading the next request without flushing.

Before this commit, the maximum number of empty lines was the same as
configured LimitRequestFields, defaulting to 100, which was way too much.
We now use a fixed/hard limit of 10 (DEFAULT_LIMIT_BLANK_LINES).

check_pipeline() is changed to check for (up to the limit) and comsume the
trailing [CR]LFs so that they won't be interpreted as pipelined requests,
otherwise we would block on the next read without flushing data, and hence
possibly delay pending response(s) until the next/real request comes in or
the keepalive timeout expires.
 
Finally, when the maximum number of empty line is reached in
read_request_line(), or that request line does not contains at least a method
and an (valid) URI, we can fail early and avoid some failure detected in
further processing.


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mod_http2: no longer messing with mod_ssl config in slave connections, special RST_STREAM failures when 403 responses are due to prohibited TLS renegotiations

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mod_ssl: check request-server for TLS settings compatible to handshake server, allow request if equal, renegotiation checks: remember last used cipher_suite for optimizations, deny any regnegotiation in presence of master connection

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new ap_is_allowed_protocol() for testing configured protocols, added H2Upgrade on/off directive, changed H2Direct default back to on when h2c is in Protocols

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configure the session/cookie expiry's update interval. PR 57300.

Submitted by: Paul Spangler <paul.spangler ni.com>
Reviewed/Committed by: ylavic


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mod_ssl: performing protocol switch directly after ALPN selection, mod_http2: connection hook inits network filters to force TLS handshake, reads input only if H2Direct explicitly enabled, changes H2Direct default to off even for cleartext connections

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We don't want to process the subrequest either in ap_sub_req_method_uri()
if the quick-handler returned an error (or any final status).


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quick-handler returned an error (or any final status).


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PR 53845: Remove commented config regarding DNT because the spec now has CR status (confirming our interpretation) and MS has committed to changing their implementation: http://blogs.microsoft.com/on-the-issues/2015/04/03/an-update-on-microsofts-approach-to-do-not-track/

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most important or common ones first.


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worker is mentioned. Existing worker text
applies to event without changes.

Thanks to Mathijs Schmittmann.


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