Apache HTTP Server（简称 Apache）是 Apache 软件基金会的一个开放源码的网页服务器，可以在大多数计算机操作系统中运行，由于其多平台和安全性被广泛使用，是最流行的 Web 服务器端软件之一。它快速、可靠并且可通过简单的 API 扩展，将 Perl/Python 等解释器编译到服务器中。 Apache HTTP Server 2.4.38 稳定版已发布，更新内容如下：
Changes with Apache 2.4.38
*) mod_ssl: Clear retry flag before aborting client-initiated renegotiation.
PR 63052 [Joe Orton]
*) mod_negotiation: Treat LanguagePriority as case-insensitive to match
AddLanguage behavior and HTTP specification. PR 39730 [Christophe Jaillet]
*) mod_md: incorrect behaviour when synchronizing ongoing ACME challenges
have been fixed. [Michael Kaufmann, Stefan Eissing]
*) mod_setenvif: We can have expressions that become true if a regex pattern
in the expression does NOT match. In this case val is NULL
and we should just set the value for the environment variable
like in the pattern case. [Ruediger Pluem]
*) mod_session: Always decode session attributes early. [Hank Ibell]
*) core: Incorrect values for environment variables are substituted when
multiple environment variables are specified in a directive. [Hank Ibell]
*) mod_rewrite: Only create the global mutex used by "RewriteMap prg:" when
this type of map is present in the configuration. PR62311.
[Hank Ibell <hwibell gmail.com>]
*) mod_dav: Fix invalid Location header when a resource is created by
passing an absolute URI on the request line [Jim Jagielski]
*) mod_session_cookie: avoid duplicate Set-Cookie header in the response.
[Emmanuel Dreyfus <[email protected]>, Luca Toscano]
*) mod_ssl: clear *SSL errors before loading certificates and checking
afterwards. Otherwise errors are reported when other SSL using modules
are in play. Fixes PR 62880. [Michael Kaufmann]
*) mod_ssl: Fix the error code returned in an error path of
'ssl_io_filter_handshake()'. This messes-up error handling performed
in 'ssl_io_filter_error()' [Yann Ylavic]
*) mod_ssl: Fix $HTTPS definition for "SSLEngine optional" case, and fix
authz provider so "Require ssl" works correctly in HTTP/2.
PR 61519, 62654. [Joe Orton, Stefan Eissing]
*) mod_proxy: If ProxyPassReverse is used for reverse mapping of relative
redirects, subsequent ProxyPassReverse statements, whether they are
relative or absolute, may fail. PR 60408. [Peter Haworth <pmh1wheel gmail.com>]
*) mod_lua: Now marked as a stable module [https://s.apache.org/Xnh1]
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