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there are no preconditions provided.

* modules/dav/main/util.c:
  (dav_validate_request): avoid validating locks and ETags when there are
    no If headers providing them on a resource we aren't modifying.


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Suggested by: kbrand


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Add compatibility note

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file ssl_util_ssl.c (no outside callers). Rename to just getIDs().


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modssl_X509_NAME_ENTRY_to_string.


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ssl_util_ssl.c (no callers outside this file). The new static function name
chosen is convert_asn1_to_utf8, based on the assumption that neither SSL_
nor ASN1_ are safe prefixes to use without potential future overlap.


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and SSL_set_app_data2 from SSL_* to modssl_*. Update references in
README.dsov.* files. Rename static variable SSL_app_data2_idx to just
app_data2_idx since the symbol is internal to ssl_util_ssl.c.


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reference to UuidCreate() to these support applications that link with 
apr-1.lib and do not already link rpcrt4.lib.



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Add support for extracting subjectAltName entries of type
rfc822Name and dNSName into SSL_{CLIENT,SERVER}_SAN_{Email,DNS}_n
variables.

* docs/manual/mod/mod_ssl.xml: add SSL_*_SAN_*_n entries to the
  environment variables table

* modules/ssl/ssl_engine_kernel.c: in ssl_hook_Fixup, add extraction
  of subjectAltName entries for the "StdEnvVars" case

* modules/ssl/ssl_engine_vars.c: add support for retrieving the
  SSL_{CLIENT,SERVER}_SAN_{Email,DNS}_n variables, either with
  individual on-demand lookup (ssl_var_lookup_ssl_cert_san),
  or with full-list extraction to the environment ("StdEnvVars")

* modules/ssl/ssl_private.h: add modssl_var_extract_san_entries prototype

* modules/ssl/ssl_util_ssl.c: implement SSL_X509_getSAN and
  SSL_ASN1_STRING_to_utf8 helper functions, with factoring out common
  code from SSL_X509_getIDs and SSL_X509_NAME_ENTRY_to_string where
  suitable. Limit SSL_X509_getSAN to the two most common subjectAltName
  entry types appearing in user or serv...

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* modules/ssl/mod_ssl.c, modules/ssl/mod_ssl.h: drop
  modssl_register_npn optional function and related declarations.

* modules/ssl/ssl_engine_init.c (ssl_init_ctx_callbacks):
  no longer set NPN advertisement callback.

* modules/ssl/ssl_engine_io.c (ssl_io_filter_input): remove
  NPN handling.

* modules/ssl/ssl_engine_kernel.c (ssl_callback_AdvertiseNextProtos):
  remove callback.

* modules/ssl/ssl_private.h: remove NPN prototypes, set
  HAVE_TLS_ALPN (OpenSSL 1.0.2 and later) with feature-based detection.

Rename SSLAlpnPreference to SSLALPNPreference, and add documentation.

Previous commits related to NPN and ALPN, for reference purposes:

r1332643 - Add support for TLS Next Protocol Negotiation
r1487772 - mod_ssl: Redesign NPN (Next Protocol Negotiation) API
           to avoid use of hooks API and inter-module hard linkage
r1670397 - ALPN support, based on mod_spdy/mod_h2 patch set
r1670434 - More ALPN goodness

(plus some minor tweaks: r1670578, r1675459, and r1675549)


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