繼先前9月26日的Apache 2.1.8測試版後，Apache組織公開釋出了新版本的網頁伺服器軟體Apache 2.1.9-beta，目前是讓用戶們協助進行測試，所以不同版本間的變動很大，尚未穩定下來。
根據Apache方面的說法，等2.1系列版本測試完畢後，就會開始測試穩定版本2.2了，期待中。
這次主要的功能改進和更新有：
*) SECURITY: CVE-2005-2970 (cve.mitre.org)
worker MPM: Fix a memory leak which can occur after an aborted
connection in some limited circumstances. [Greg Ames]
*) Add mod_authn_dbd (SQL-based authentication) [Nick Kew]
*) mod_proxy_ajp: Do not spool the entire response from AJP backend before
sending it up the filter chain. PR 37100. [Ruediger Pluem]
*) mod_cache: Create new filters CACHE_OUT_SUBREQ / CACHE_SAVE_SUBREQ which
only differ by the type from CACHE_OUT / CACHE_SAVE to ensure that
subrequests to non-local resources work again. [Ruediger Pluem]
*) mod_proxy: Do not lowercase the entire worker name of a BalancerMember
since this breaks case sensitive URI's. PR 36906. [Ruediger Pluem]
*) core: AddOutputFilterByType is ignored for proxied requests. PR 31226.
[Joe Orton, Ruediger Pluem]
*) mod_proxy_http: Prevent data corruption of POST request bodies when
client accesses proxied resources with SSL. PR 37145.
[Ruediger Pluem, William Rowe]
*) mod_ssl: Fix issue which could cause spurious warnings about use
of name-based vhosts. PR 37051. [Joe Orton]
*) ab: Fix to ensure that only the expected number of requests are run.
PR 36966. [Joe Orton]
*) mod_proxy_balancer: BalancerManager and proxies correctly handle
member workers with paths. PR 36816. [Ruediger Pluem, Jim Jagielski]
*) mod_log_config: %{hextid}P will log the thread id in hex with APR
versions 1.2.0 or higher. [Jeff Trawick]
*) httpd.exe/apachectl -V: display the DYNAMIC_MODULE_LIMIT setting, as
in 1.3. [Jeff Trawick]
*) Support dbd connection tied to conn_rec in mod_dbd. [Nick Kew]
*) Fix use of pools in mod_dbd. [Brian J France, Nick Kew]
*) Promote modules from "experimental": mod_dbd, mod_filter,
mod_charset_lite. [Nick Kew]
*) mod_proxy_ajp: mod_proxy_ajp sends empty SSL attributes for non SSL
connections. PR 36883.
[William Barker <william.barker wilshire.com>, Ruediger Pluem]
*) Eliminated the NET_TIME filter, restructuring the timeout logic.
This provides a working mod_echo on all platforms, and ensures any
custom protocol module is at least given an initial timeout value
based on the <VirtualHost > context's Timeout directive.
[William Rowe]
*) mod_proxy: Run the request_status hook also if there are no free workers
or all workers are in error state.
[Ruediger Pluem, Brian Akins <brian.akins turner.com>]
*) mod_proxy_connect: Fix high CPU loop on systems like UnixWare which
trigger POLL_ERR or POLL_HUP on a terminated connection. PR 36951.
[Jeff Trawick, Ruediger Pluem]
*) mod_proxy_balancer: Fix handling of sticky sessions with Tomcat.
PR 36507. [Ruediger Pluem]
*) Doxygen fixups. [Neale Ranns <neale ranns.org>, Ian Holsman]
*) mod_cache/mod_dir: Correct a subrequest lookup bug which was preventing
mod_dir from serving indexes correctly with mod_cache enabled.
[Colm MacCarthaigh]
