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mod_http2: new directive H2EarlyHints



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mod_http2: PUSH triggers only on GET
mod_proxy_http2: 1xx responses not forwarded unconditionally on HTTP/1.x connections


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mod_ssl: Fix quick renegotiation (OptRenegotiaton) with no intermediate
in the client certificate chain.  PR 55786.

This is done by handling an empty cert chain as no/NULL chain.


Submitted by: ylavic
Reviewed/backported by: jim


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Was folded into Revision 1769595 ??



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Replace jim's proposal into smaller chunks that are IMHO easier to review.

The end result is the same, except for the CHANGES entry and one comment that I
added to r1770752 vs. the Bugzilla patch and that was missing in jim's patch.


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CMake: use CMAKE_REQUIRED_INCLUDES to find APR macros

When using CMake with Visual Studio on Windows, invoking the
CHECK_SYMBOL_EXISTS macro with the full paths to the include files seems
to always result in failure.

Instead, use the documented CMAKE_REQUIRED_INCLUDES variable to set the
include directory, and pass only the headers' base names to
CHECK_SYMBOL_EXISTS.

CMake: use generator expressions to find output files

Multi-configuration generators, like Visual Studio, use a different
output directory (Debug, Release, etc.) for each configuration. To find
the output files reliably, switch to using generator expressions instead
of hardcoding the file paths for PDBs, export files, etc.

CMake: quote installation paths

Deal with installation paths with spaces in them (e.g. "C:\Program
Files") by quoting the arguments to perl and xcopy.
Submitted by: jchampion
Reviewed/backported by: jim


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ssl: clear the error queue before SSL_read/write/accept()

If other modules or libraries do not clear the OpenSSL error queue after
a failed operation, other code that relies on SSL_get_error() -- in
particular, code that deals with SSL_ERROR_WANT_READ/WRITE logic -- will
malfunction later on. To prevent this, explicitly clear the error queue
before calls like SSL_read/write/accept().

PR: 60223
Submitted by: Paul Spangler <paul.spangler ni.com>
Submitted by: jchampion
Reviewed/backported by: jim


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Avoid adding duplicate subequest filters, as they would not be stripped
properly during an ap_internal_fast_redirect.


Submitted by: covener
Reviewed/backported by: jim


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Added a note in the mod_headers docs about Content-Type and setifempty

This note has been added as a follow up of a stack overflow post
(thanks to Michael Allan for the research):

http://stackoverflow.com/questions/29398123/apache-2-4-set-mime-type-of-file-without-extension

After a chat in #httpd-dev it seems that the issue boils down to how %{CONTENT_TYPE}
is evaluated in util_expr_eval.c (r->content_type) vs how setifempty is (only a check
of the response headers). This particular behavior might be a bug or feature,
but it is worth to alert our users.

Submitted by: elukey


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This commit also revert my last one about H2PushResource.
After a chat on #http-dev we decided to make it public since
it holds a Compatibility section.



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The directive will be available only from 2.4.24 onwards,
reverting to avoid confusing users.



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Unified duplicate warning in mod_proxy ProxyPass documentation.

Also changed terminology to be in sync with:
https://httpd.apache.org/docs/current/mod/directive-dict.html#Context

It was confusing in my opinion to read that ProxyPass wasn't supported
for the <Directory> context (since "directory" semantic is already
overloaded).



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ab: follow up to r1733537: CHANGES entry.


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Updated changelog with the last change of mod_proxy_fcgi

r1759984, r1760018 and r1752347 are all changes related
to a bug fixed for mod_proxy_fcgi.

Submitted by: elukey


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Following up on r1764040, add the CHANGES entry.

Submitted by: kotkov


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mod_http2: fixes for compiler warnings



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