Log Message:
Changes with Apache 2.4.17

  *) mod_http2: added donated HTTP/2 implementation via core module. Similar
     configuration options to mod_ssl.

  *) mod_proxy: don't recyle backend announced "Connection: close" \ 
connections
     to avoid reusing it should the close be effective after some new request
     is ready to be sent.

  *) mod_substitute: Allow to configure the patterns merge order with the new
     SubstituteInheritBefore on|off directive.

  *) mod_proxy: Fix ProxySourceAddress binding failure with AH00938.

  *) mod_ssl: Support compilation against libssl built with OPENSSL_NO_SSL3,
     and change the compiled-in default for SSL[Proxy]Protocol to "all \ 
-SSLv3",
     in accordance with RFC 7568.

  *) mod_ssl: append :!aNULL:!eNULL:!EXP to the cipher string settings,
     instead of prepending !aNULL:!eNULL:!EXP: (as was the case in 2.4.7
     and later). Enables support for configuring the SUITEB* cipher
     strings introduced in OpenSSL 1.0.2.

  *) mod_ssl: Add support for extracting the msUPN and dnsSRV forms
     of subjectAltName entries of type "otherName" into
     SSL_{CLIENT,SERVER}_SAN_OTHER_{msUPN,dnsSRV}_n environment
     variables.

  *) mod_logio: Fix logging of %^FB (time to first byte) on the first request on
     an SSL connection.

  *) mod_cache: r->err_headers_out is not merged into
     r->headers when mod_cache is enabled and the response
     is cached for the first time.

  *) mod_slotmem_shm: Fix slots/SHM files names on restart for systems that
     can't create new (clear) slots while previous children gracefully stopping
     still use the old ones (e.g. Windows, OS2). mod_proxy_balancer failed to
     restart whenever the number of configured balancers/members changed during
     restart.

  *) core/util_script: make REDIRECT_URL a full URL.

  *) MPMs: Support SO_REUSEPORT to create multiple duplicated listener
     records for scalability.

  *) mod_proxy: Fix a race condition that caused a failed worker to be retried
     before the retry period is over.

  *) mod_autoindex: Allow autoindexes when neither mod_dir nor mod_mime are
     loaded.

  *) mod_rewrite:  Allow cookies set by mod_rewrite to contain ':' by accepting
     ';' as an alternate separator.

  *) apxs: Add HTTPD_VERSION and HTTPD_MMN to the variables available with
     apxs -q.

  *) mod_rewrite: Avoid a crash when lacking correct DB access permissions
     when using RewriteMap with MapType dbd or fastdbd.

  *) mod_authz_dbd: Avoid a crash when lacking correct DB access permissions.

  *) mod_socache_memcache: Add the 'MemcacheConnTTL' directive to control how
     long to keep idle connections with the memcache server(s).
     Change default value from 600 usec (!) to 15 sec.

  *) mod_dir: Prevent the internal identifier "httpd/unix-directory" from
     appearing as a Content-Type response header when requests for a directory
     are rewritten by mod_rewrite.