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                    in both r->headers_out and r->err_headers_out
                    to avoid duplication.

In session_cookie_save it seems that ap_cookie_write is called
with r->headers_out and r->err_headers_out, ending up in the same
Set-Cookie header on both tables and eventually duplicated in the
HTTP response. I took Emmanuel's patch and trimmed out the bits
that remove the header only from r->err_headers_out (leaving it
to do the work on both tables) as attempt to change this bit of code
in the most conservative way as possible. Sending a commit for
a broader review.

PR: 60910,56098,55278



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responses allowing these modules to properly set or fix-up the response
headers such as Vary or ETag.

This change follows up on r1837056 that disabled that special handling and
thus resulted in a potential violation of RFC7232, 4.1:

   The server generating a 304 response MUST generate any of the following
   header fields that would have been sent in a 200 (OK) response to the
   same request: Cache-Control, Content-Location, Date, ETag, Expires,
   and Vary.)

References:
  https://lists.apache.org/thread.html/f5733ca6743757e8aa8b58a0cd9e27680971551c2a20f5606c66507e@%3Cdev.httpd.apache.org%3E
  https://tools.ietf.org/html/rfc7232#section-4.1

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  statedir-relative default lock database path.


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with default from config.layout, configurable via DefaultStateDir.

* server/core.c (set_state_dir, ap_state_dir_relative):
  New functions.
  
* config.layout, acinclude.m4, Makefile.in, configure.in: Define
  statedir variables, drop davlockdb.

* include/ap_config_layout.h.in: Define DEFAULT_REL_STATEDIR,
  DEFAULT_EXP_STATEDIR in place of _DAVLOCKDB.

* include/ap_mmn.h: Bump MMN minor.


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  mkdir_structure error case.  Fixes Coverity warning.


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  error case, as required by C89/POSIX stdarg.h - Coverity warns for
  this.


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  rather than leak caches if all three cannot be allocated (Coverity
  warning).  Remove unnecessary pointer.


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  (deflate_out_filter): Fix typo setting output note. (Coverity warning)
  (deflate_in_filter): Fix redundant assignment. (clang warning)


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  redundant branch (warning from Coverity).


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  redundant assignment (clang warning).


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  redundant assignment (clang warning), the apr_file_eof(fp)=>APR_EOF
  case assigns rv to APR_EOF and then to APR_SUCCESS after already.


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  buffer to avoid potential (harmless) memcmp comparison against
  garbage stack data later.  (clang warning).


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  not the configuration settings for frontend connections in case of
  connections by the proxy to the backend.

PR: 62769


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Use priority to remove the ambiguity.

The only rational for choosing "3" and "4" for these priorities, is that "4" is related to <h4> tags, and 3=4-1 for the previous level.

Tested with the actual Xalan XSL engine:
   ./build.sh all
with and without the change.
Outputs are exactly the same.

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Some rules to help me detect un-needed links to directives, or missing ones were sent by error

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Use priority to remove the ambiguity.

The only rational for choosing "3" and "4" for these priorities, is that "4" is related to <h4> tags, and 3=4-1 for the previous level.

Tested with the actual Xalan XSL engine:
   ./build.sh all
with and without the change.
Outputs are exactly the same.

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The XSLT Saxon engine warns that  match="@*" will return only attribute nodes, which can't have any attributes or child.

So simplify the xsl rules accordingly.

Tested with:
   ./build.sh all
with and without the change.
Outputs are exactly the same.

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  pool. Hence close the propdb *after* dav_stream_response which clears thei
  probdb pool.


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* modules/http/http_protocol.c (status_lines,
  get_canned_error_string): Add 425 response.


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