mod_http2: fixes timeout vs. keepalive timeout use when closing streams on flush, adding pseudo header length check against limit_req_line

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Reviewed.

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mod_rewrite: adding h2:// and h2c:// proxy schemes to absolute uri detection, patch by Evgeny Kotkov

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Improve layout.
Synchronize with 2.4.x for relevant parts

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adjusteing changes after backport, mod_http2: version bump, adding modified patch for c->aborted by Michael Kaufmann

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server-status request info when a timeout happens.


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is not fiddling with connection changes but instead
use a NULL request like in similar places.


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read_request_line() fails with a timeout.
In that case there's no new useful request
info available.

Noticed via server-status showing request
"NULL" after keep-alive connections timed out.


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during detection of libnghttp2. "ab" doesn't
yet support http2.

The macros were probably copied over from our
OpenSSL detection, where it actually makes
sense to adjust the "ab" flags.


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Not sure this can happen, but the tests in this function handle such a case, so they should  handle it correctly.

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