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+<!-- $LastChangedRevision$ -->
-<title>Overview of new features in Apache 2.0</title>
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+<manualpage metafile="new_features_2_0.xml.meta">
+
+<title>Overview of new features in Apache HTTP Server 2.0</title>
<summary>
- <p>Enhancements:</p>
+ <p>This document describes some of the major changes between the
+ 1.3 and 2.0 versions of the Apache HTTP Server.</p>
</summary>
+<seealso><a href="upgrading.html">Upgrading to 2.0 from 1.3</a></seealso>
+
<section id="core">
<title>Core Enhancements</title>
<dl>
- <dt><strong>Unix Threading</strong></dt>
+ <dt>Unix Threading</dt>
- <dd>On Unix systems with POSIX threads support, Apache can
+ <dd>On Unix systems with POSIX threads support, Apache httpd can
now run in a hybrid multiprocess, multithreaded mode. This
improves scalability for many, but not all configurations.</dd>
- <dt><strong>New Build System</strong></dt>
+ <dt>New Build System</dt>
<dd>The build system has been rewritten from scratch to be
- based on autoconf and libtool. This makes Apache's
- configuration system more similar to that of other
- packages.</dd>
+ based on <code>autoconf</code> and <code>libtool</code>.
+ This makes Apache httpd's configuration system more similar to
+ that of other packages.</dd>
- <dt><strong>Multiprotocol Support</strong></dt>
+ <dt>Multiprotocol Support</dt>
- <dd>Apache now has some of the infrastructure in place to
- support serving multiple protocols. mod_echo has been written
- as an example.</dd>
+ <dd>Apache HTTP Server now has some of the infrastructure in place to
+ support serving multiple protocols. <module>mod_echo</module> has
+ been written as an example.</dd>
- <dt><strong>Better support for non-Unix
- platforms</strong></dt>
+ <dt>Better support for non-Unix
+ platforms</dt>
- <dd>Apache 2.0 is faster and more stable on non-Unix
+ <dd>Apache HTTP Server 2.0 is faster and more stable on non-Unix
platforms such as BeOS, OS/2, and Windows. With the
introduction of platform-specific <a
href="mpm.html">multi-processing modules</a> (MPMs) and the
implemented in their native API, avoiding the often buggy and
poorly performing POSIX-emulation layers.</dd>
- <dt><strong>New Apache API</strong></dt>
+ <dt>New Apache httpd API</dt>
<dd>The API for modules has changed significantly for 2.0.
Many of the module-ordering/-priority problems from 1.3 should
be gone. 2.0 does much of this automatically, and module ordering
is now done per-hook to allow more flexibility. Also, new calls
have been added that provide additional module capabilities
- without patching the core Apache server.</dd>
+ without patching the core Apache HTTP Server.</dd>
- <dt><strong>IPv6 Support</strong></dt>
+ <dt>IPv6 Support</dt>
<dd>On systems where IPv6 is supported by the underlying
- Apache Portable Runtime library, Apache gets IPv6 listening
+ Apache Portable Runtime library, Apache httpd gets IPv6 listening
sockets by default. Additionally, the <directive
module="mpm_common">Listen</directive>, <directive module="core"
>NameVirtualHost</directive>, and <directive module="core"
>VirtualHost</directive> directives support
- IPv6 numeric address strings (e.g., "Listen
- [fe80::1]:8080").</dd>
+ IPv6 numeric address strings (e.g., "<code>Listen
+ [2001:db8::1]:8080</code>").</dd>
- <dt><strong>Filtering</strong></dt>
+ <dt>Filtering</dt>
- <dd>Apache modules may now be written as filters which act on
+ <dd>Apache httpd modules may now be written as filters which act on
the stream of content as it is delivered to or from the
- server. This allows, for example, the output of CGI scripts
- to be parsed for Server Side Include directives using the
- INCLUDES filter in mod_include.</dd>
+ server. This allows, for example, the output of CGI scripts to
+ be parsed for Server Side Include directives using the
+ <code>INCLUDES</code> filter in <module>mod_include</module>. The
+ module <module>mod_ext_filter</module> allows external programs to
+ act as filters in much the same way that CGI programs can act as
+ handlers.</dd>
- <dt><strong>Multilanguage Error Responses</strong></dt>
+ <dt>Multilanguage Error Responses</dt>
- <dd>Error response messages to the browser are now provided in
- several languages, using SSI documents. They may be customized
+ <dd>Error response messages to the browser are now provided in
+ several languages, using SSI documents. They may be customized
by the administrator to achieve a consistent look and feel.</dd>
- <dt><strong>Simplified configuration</strong></dt>
+ <dt>Simplified configuration</dt>
<dd>Many confusing directives have been simplified. The often
- confusing Port and BindAddress directives are gone; only the
- Listen directive is used for IP address binding; the
- ServerName directive specifies the server name and port number
- only for redirection and vhost recognition.</dd>
+ confusing <code>Port</code> and <code>BindAddress</code> directives
+ are gone; only the <directive module="mpm_common">Listen</directive>
+ directive is used for IP address binding; the <directive
+ module="core">ServerName</directive> directive specifies the
+ server name and port number only for redirection and vhost
+ recognition.</dd>
- <dt><strong>Native Windows NT Unicode Support</strong></dt>
+ <dt>Native Windows NT Unicode Support</dt>
- <dd>Apache 2.0 on Windows NT now uses utf-8 for all filename
+ <dd>Apache httpd 2.0 on Windows NT now uses utf-8 for all filename
encodings. These directly translate to the underlying Unicode
- file system, providing multilanguage support for all Windows
+ file system, providing multilanguage support for all Windows
NT-based installations, including Windows 2000 and Windows XP.
- <em>This support does not extend to Windows 95, 98 or ME, which
- continue to use the machine's local codepage for filesystem
+ <em>This support does not extend to Windows 95, 98 or ME, which
+ continue to use the machine's local codepage for filesystem
access.</em></dd>
+
+ <dt>Regular Expression Library Updated</dt>
+
+ <dd>Apache httpd 2.0 includes the <a href="http://www.pcre.org/">Perl
+ Compatible Regular Expression Library</a> (PCRE). All regular
+ expression evaluation now uses the more powerful Perl 5
+ syntax.</dd>
+
</dl>
</section>
<title>Module Enhancements</title>
<dl>
- <dt><strong>mod_ssl</strong></dt>
+ <dt><module>mod_ssl</module></dt>
- <dd>New module in Apache 2.0. This module is an interface
+ <dd>New module in Apache httpd 2.0. This module is an interface
to the SSL/TLS encryption protocols provided by
OpenSSL.</dd>
- <dt><strong>mod_dav</strong></dt>
+ <dt><module>mod_dav</module></dt>
- <dd>New module in Apache 2.0. This module implements the HTTP
+ <dd>New module in Apache httpd 2.0. This module implements the HTTP
Distributed Authoring and Versioning (DAV) specification for
posting and maintaining web content.</dd>
- <dt><strong>mod_auth_digest</strong></dt>
+ <dt><module>mod_deflate</module></dt>
+
+ <dd>New module in Apache httpd 2.0. This module allows supporting
+ browsers to request that content be compressed before delivery,
+ saving network bandwidth.</dd>
+
+ <dt><module>mod_auth_ldap</module></dt>
+
+ <dd>New module in Apache httpd 2.0.41. This module allows an LDAP
+ database to be used to store credentials for HTTP Basic
+ Authentication. A companion module, <module>mod_ldap</module>
+ provides connection pooling and results caching.</dd>
+
+ <dt><module>mod_auth_digest</module></dt>
<dd>Includes additional support for session caching across
processes using shared memory.</dd>
- <dt><strong>mod_charset_lite</strong></dt>
+ <dt><module>mod_charset_lite</module></dt>
- <dd>New module in Apache 2.0. This experimental module allows
+ <dd>New module in Apache httpd 2.0. This experimental module allows
for character set translation or recoding.</dd>
- <dt><strong>mod_file_cache</strong></dt>
+ <dt><module>mod_file_cache</module></dt>
- <dd>New module in Apache 2.0. This module includes the
- functionality of mod_mmap_static in Apache 1.3, plus adds
- further caching abilities.</dd>
+ <dd>New module in Apache httpd 2.0. This module includes the
+ functionality of <code>mod_mmap_static</code> in Apache HTTP
+ Server version 1.3, plus adds further caching abilities.</dd>
- <dt><strong>mod_headers</strong></dt>
+ <dt><module>mod_headers</module></dt>
- <dd>This module is much more flexible in Apache 2.0. It can
- now modify request headers used by mod_proxy, and it can
- conditionally set response headers.</dd>
+ <dd>This module is much more flexible in Apache httpd 2.0. It can now
+ modify request headers used by <module>mod_proxy</module>, and
+ it can conditionally set response headers.</dd>
- <dt><strong>mod_proxy</strong></dt>
+ <dt><module>mod_proxy</module></dt>
- <dd>The proxy module has been completely rewritten to take advantage
- of the new filter infrastructure and to implement a more
- reliable, HTTP/1.1 compliant proxy. In addition, new
- <Proxy> configuration sections provide more readable
- (and internally faster) control of proxied sites; overloaded
- <Directory "proxy:..."> configuration are not supported. The
- module is now divided into specific protocol support modules
- including proxy_connect, proxy_ftp and proxy_http.</dd>
+ <dd>The proxy module has been completely rewritten to take
+ advantage of the new filter infrastructure and to implement a
+ more reliable, HTTP/1.1 compliant proxy. In addition, new
+ <directive module="mod_proxy" type="section">Proxy</directive>
+ configuration sections provide more readable (and internally
+ faster) control of proxied sites; overloaded <code><Directory
+ "proxy:..."></code> configuration are not supported. The module
+ is now divided into specific protocol support modules including
+ <code>proxy_connect</code>, <code>proxy_ftp</code> and
+ <code>proxy_http</code>.</dd>
- <dt><strong>mod_negotiation</strong></dt>
+ <dt><module>mod_negotiation</module></dt>
<dd>A new <directive module="mod_negotiation"
>ForceLanguagePriority</directive> directive can be used to assure that
provide more consistent results and a new form of type map that
can include document content is provided.</dd>
- <dt><strong>mod_autoindex</strong></dt>
+ <dt><module>mod_autoindex</module></dt>
- <dd>Autoindex'ed directory listings can now be configured to
+ <dd>Autoindex'ed directory listings can now be configured to
use HTML tables for cleaner formatting, and allow finer-grained
control of sorting, including version-sorting, and wildcard
filtering of the directory listing.</dd>
- <dt><strong>mod_include</strong></dt>
+ <dt><module>mod_include</module></dt>
<dd>New directives allow the default start and end tags for SSI elements
to be changed and allow for error and time format configuration
to take place in the main configuration file rather than in the
SSI document. Results from regular expression parsing and grouping
(now based on Perl's regular expression syntax) can be retrieved
- using mod_include's variables $0 .. $9.</dd>
+ using <module>mod_include</module>'s variables <code>$0</code>
+ .. <code>$9</code>.</dd>
- <dt><strong>mod_auth_dbm</strong></dt>
+ <dt><module>mod_auth_dbm</module></dt>
<dd>Now supports multiple types of DBM-like databases using the
- <directive module="mod_auth_dbm">AuthDBMType</directive>
+ <a href="../2.0/mod/mod_auth_dbm.html#AuthDBMType"><code>AuthDBMType</code></a>
directive.</dd>
- <dt><strong>mod_auth_db</strong></dt>
-
- <dd>Has been removed in favor of mod_auth_dbm with the AuthDBMType
- directive.</dd>
</dl>
</section>
</manualpage>
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