Changes with Apache 2.4.28
*) SECURITY: CVE-2017-9798 (cve.mitre.org)
Corrupted or freed memory access. <Limit[Except]> must now be used in the
main configuration file (httpd.conf) to register HTTP methods before the
.htaccess files.
*) event: Avoid possible blocking in the listener thread when shutting down
connections.
*) mod_speling: Don't embed referer data in a link in error page.
*) htdigest: prevent a buffer overflow when a string exceeds the allowed max
length in a password file.
*) mod_proxy: loadfactor parameter can now be a decimal number (eg: 1.25).
*) mod_proxy_wstunnel: Allow upgrade to any protocol dynamically.
*) mod_watchdog/mod_proxy_hcheck: Time intervals can now be spefified
down to the millisecond. Supports 'mi' (minute), 'ms' (millisecond),
's' (second) and 'hr' (hour!) time suffixes.
*) mod_http2: Fix for stalling when more than 32KB are written to a
suspended stream.
*) build: allow configuration without APR sources.
*) mod_ssl, ab: Fix compatibility with LibreSSL.
*) core/log: Support use of optional "tag" in syslog entries.
*) mod_proxy: Fix ProxyAddHeaders merging.
*) core: Disallow multiple Listen on the same IP:port when listener buckets
are configured (ListenCoresBucketsRatio > 0), consistently with the single
bucket case (default), thus avoiding the leak of the corresponding socket
descriptors on graceful restart.
*) event: Avoid listener periodic wake ups by using the pollset wake-ability
when available.
*) mod_proxy_wstunnel: Fix detection of unresponded request which could have
led to spurious HTTP 502 error messages sent on upgrade connections.
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