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Overview of new features in Apache HTTP Server 2.0 - Apache HTTP Server Version 2.4








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Apache HTTP Server Version 2.4



Apache > HTTP Server > Documentation > Version 2.4Overview of new features in Apache HTTP Server 2.0

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  This document describes some of the major changes between the
     1.3 and 2.0 versions of the Apache HTTP Server.

 Core Enhancements
 Module Enhancements
See alsoUpgrading to 2.0 from 1.3Comments


Core Enhancements
    

    
      Unix Threading

      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.

      New Build System

      The build system has been rewritten from scratch to be
      based on autoconf and libtool.
      This makes Apache httpd's configuration system more similar to
      that of other packages.

      Multiprotocol Support

      Apache HTTP Server now has some of the infrastructure in place to
      support serving multiple protocols. mod_echo has
      been written as an example.

      Better support for non-Unix
      platforms

      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 multi-processing modules (MPMs) and the
      Apache Portable Runtime (APR), these platforms are now
      implemented in their native API, avoiding the often buggy and
      poorly performing POSIX-emulation layers.

      New Apache httpd API

      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 HTTP Server.

      IPv6 Support

      On systems where IPv6 is supported by the underlying
      Apache Portable Runtime library, Apache httpd gets IPv6 listening
      sockets by default. Additionally, the Listen, NameVirtualHost, and VirtualHost directives support
      IPv6 numeric address strings (e.g., "Listen
      [2001:db8::1]:8080").

      Filtering

      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. The
      module mod_ext_filter allows external programs to
      act as filters in much the same way that CGI programs can act as
      handlers.

      Multilanguage Error Responses

      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.

      Simplified configuration

      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.

      Native Windows NT Unicode Support

      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
      NT-based installations, including Windows 2000 and Windows XP.
      This support does not extend to Windows 95, 98 or ME, which
      continue to use the machine's local codepage for filesystem
      access.

      Regular Expression Library Updated

      Apache httpd 2.0 includes the Perl
      Compatible Regular Expression Library (PCRE).  All regular
      expression evaluation now uses the more powerful Perl 5
      syntax.

    
  

Module Enhancements
    

    
      mod_ssl

      New module in Apache httpd 2.0. This module is an interface
      to the SSL/TLS encryption protocols provided by
      OpenSSL.

      mod_dav

      New module in Apache httpd 2.0. This module implements the HTTP
      Distributed Authoring and Versioning (DAV) specification for
      posting and maintaining web content.

      mod_deflate

      New module in Apache httpd 2.0.  This module allows supporting
      browsers to request that content be compressed before delivery,
      saving network bandwidth.

      mod_auth_ldap

      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, mod_ldap
      provides connection pooling and results caching.

      mod_auth_digest

      Includes additional support for session caching across
      processes using shared memory.

      mod_charset_lite

      New module in Apache httpd 2.0. This experimental module allows
      for character set translation or recoding.

      mod_file_cache

      New module in Apache httpd 2.0. This module includes the
      functionality of mod_mmap_static in Apache HTTP
      Server version 1.3, plus adds further caching abilities.

      mod_headers

      This module is much more flexible in Apache httpd 2.0. It can now
      modify request headers used by mod_proxy, and
      it can conditionally set response headers.

      mod_proxy

      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.

      mod_negotiation

      A new ForceLanguagePriority directive can be used to assure that
      the client receives a single document in all cases, rather than
      NOT ACCEPTABLE or MULTIPLE CHOICES responses. In addition, the
      negotiation and MultiViews algorithms have been cleaned up to
      provide more consistent results and a new form of type map that
      can include document content is provided.

      mod_autoindex

      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.

      mod_include

      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.

      mod_auth_dbm

      Now supports multiple types of DBM-like databases using the
      AuthDBMType directive.

    
  

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CommentsNotice:This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our mailing lists.

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