Apache HTTP Server（簡稱Apache）是Apache軟件基金會的一個開放源碼的網頁服務器，可以在大多數計算機操作系統中運行，由于其跨平臺和安全性被廣泛 使用，是最流行的Web服務器端軟件之一。它快速、可靠并且可通過簡單的API擴充，將Perl／Python等解釋器編譯到服務器中。

*) Ensure each subrequest has a shallow copy of headers_in so that the
parent request headers are not corrupted. Elimiates a problematic
optimization in the case of no request body. PR 48359
[Jake Scott, William Rowe, Ruediger Pluem]
*) Turn static function get_server_name_for_url() into public
ap_get_server_name_for_url() and use it where appropriate. This
fixes mod_rewrite generating invalid URLs for redirects to IPv6
literal addresses. [Stefan Fritsch]
*) mod_ldap: Introduce new config option LDAPTimeout to set the timeout
for LDAP operations like bind and search. [Stefan Fritsch]
*) mod_proxy, mod_proxy_ftp: Move ProxyFtpDirCharset from mod_proxy to
mod_proxy_ftp. [Takashi Sato]
*) mod_proxy, mod_proxy_connect: Move AllowCONNECT from mod_proxy to
mod_proxy_connect. [Takashi Sato]
*) mod_cache: Do an exact match of the keys defined by
CacheIgnoreURLSessionIdentifiers against the querystring instead of
a partial match. PR 48401.i
[Dodou Wang , Ruediger Pluem]
*) mod_proxy_balancer: Fix crash in balancer-manager. [Rainer Jung]
*) Core HTTP: disable keepalive when the Client has sent
Expect: 100-continue
but we respond directly with a non-100 response.
Keepalive here led to data from clients continuing being treated as
a new request.
PR 47087 [Nick Kew]
*) Core: reject NULLs in request line or request headers.
PR 43039 [Nick Kew]
*) Core: (re)-introduce -T commandline option to suppress documentroot
check at startup.
PR 41887 [Jan van den Berg ]
*) mod_autoindex: support XHTML as equivalent to HTML in IndexOptions,
ScanHTMLTitles, ReadmeName, HeaderName
PR 48416 [Dmitry Bakshaev , Nick Kew]
*) Proxy: Fix ProxyPassReverse with relative URL
Derived (slightly erroneously) from PR 38864 [Nick Kew]
*) mod_headers: align Header Edit with Header Set when used on Content-Type
PR 48422 [Cyril Bont茅 , Nick Kew>]
*) mod_headers: Enable multi-match-and-replace edit option
PR 47066 [Nick Kew]
*) mod_filter: enable it to act on non-200 responses.
PR 48377 [Nick Kew]