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Merge r1697855, r1697339, r1696428, r1696266, r1696264, r1695874, r1695727, r1692516, r1692486, r1610674, r1685069, r1693918, r1698116, r1698133, r1694950, r1700968, r1701005, r1701145, r1701178 from trunk:

adding ap_get_protocol(c) which safeguards against NULL returns, for use instead of direct calling ap_run_protocol_get

changed Protocols to let vhosts override servers, removed old H2Engine example from readme

creating ap_array_index in util, forwarding scheme into request processing, enabling SSL vars only when scheme is not http:, delayed connection creation until task worker assignment

removed unnecessary lingering_close and sbh update on end of protocol upgrade handling

introducing ap_array_index in util, used in protocol and mod_h2

fixes existing protocol missing in selection if not explicitly proposed

new directive ProtocolsHonorOrder, added documentation for Protocols feature, changed preference selection and config merging

removed accidental code

new Protocols directive and core API cha...

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Don't count initial handshake I/O when determining the first byte.
PR58454

Submitted By: Konstantin J. Chernov
Committed By: covener




Avoid storing request stuff in r->connection->conn_config to
avoid problems with e.g. write completion.


Submitted by: covener
Reviewed/backported by: jim


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Fix a spurious test where a condition is always true:
      if ((cfg->skipto != NULL) && (ctx->flags | ENC_SKIPTO)) {
                                    ^^^^^^^^^^^^^^^^^^^^^^^

This is apparently harmless because, in 'xml2enc_filter_init', the ENC_SKIPTO bit of 'flags' is set to ENC_SKIPTO if 'skipto' is non-NULL.
Submitted by: jailletc36
Reviewed/backported by: jim


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r->headers when mod_cache is enabled and the response
is cached for the first time.

Submitted by: elu
Reviewed by: ylavic, minfrin


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can't create new (clear) slots while previous children gracefully stopping
still use the old ones (e.g. Windows, OS2). PR 58024.

Submitted by: ylavic
Reviewed by: jim, minfrin


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PR 57785

Submitted by: niq
Reviewed by: jim, minfrin


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records for scalability.

Submitted by: Yingqi Lu <yingqi.lu@intel.com>, Jeff Trawick,
              Jim Jagielski, Yann Ylavic

Reviewed by: ylavic, jim, minfrin


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