From 6beeb1b708550be0d4a53b272283e17e5e35fe17 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:01:30 +0200 Subject: Adding upstream version 2.4.57. Signed-off-by: Daniel Baumann --- docs/manual/new_features_2_2.html.en | 305 +++++++++++++++++++++++++++++++++++ 1 file changed, 305 insertions(+) create mode 100644 docs/manual/new_features_2_2.html.en (limited to 'docs/manual/new_features_2_2.html.en') diff --git a/docs/manual/new_features_2_2.html.en b/docs/manual/new_features_2_2.html.en new file mode 100644 index 0000000..be23b4f --- /dev/null +++ b/docs/manual/new_features_2_2.html.en @@ -0,0 +1,305 @@ + + + + + +Overview of new features in Apache HTTP Server 2.2 - Apache HTTP Server Version 2.4 + + + + + + +
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Modules | Directives | FAQ | Glossary | Sitemap

+

Apache HTTP Server Version 2.4

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Overview of new features in Apache HTTP Server 2.2

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Available Languages:  en  | + fr  | + ko  | + pt-br  | + tr 

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This document describes some of the major changes between the + 2.0 and 2.2 versions of the Apache HTTP Server. For new features since + version 1.3, see the 2.0 new features + document.

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+

Core Enhancements

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+ +
Authn/Authz
+
The bundled authentication and authorization modules have + been refactored. The new mod_authn_alias(already removed from 2.3/2.4) + module can greatly simplify certain authentication configurations. + See module name changes, and + the developer changes for more + information about how these changes affects users and module + writers.
+ +
Caching
+
mod_cache, mod_cache_disk, and + mod_mem_cache(already removed from 2.3/2.4) have undergone a lot of changes, and + are now considered production-quality. htcacheclean + has been introduced to clean up mod_cache_disk + setups.
+ +
Configuration
+
The default configuration layout has been simplified and + modularised. Configuration snippets which can be used to + enable commonly-used features are now bundled with Apache, and + can be easily added to the main server config.
+ +
Graceful stop
+
The prefork, worker and + event MPMs now allow httpd + to be shutdown gracefully via the + graceful-stop + signal. The GracefulShutdownTimeout directive + has been added to specify an optional timeout, after which + httpd will terminate regardless of the status + of any requests being served.
+ +
Proxying
+
The new mod_proxy_balancer module provides + load balancing services for mod_proxy. + The new mod_proxy_ajp module adds support for the + Apache JServ Protocol version 1.3 used by + Apache Tomcat.
+ +
Regular Expression Library Updated
+
Version 5.0 of the + Perl Compatible Regular Expression + Library (PCRE) is now included. httpd can be + configured to use a system installation of PCRE by passing the + --with-pcre flag to configure.
+ +
Smart Filtering
+
mod_filter introduces dynamic configuration + to the output filter chain. It enables filters to be conditionally + inserted, based on any Request or Response header or environment + variable, and dispenses with the more problematic dependencies and + ordering problems in the 2.0 architecture.
+ +
Large File Support
+
httpd is now built with support for files larger + than 2GB on modern 32-bit Unix systems. Support for handling + >2GB request bodies has also been added.
+ +
Event MPM
+
The event MPM uses a separate thread to handle + Keep Alive requests and accepting connections. Keep Alive requests + have traditionally required httpd to dedicate a worker to handle it. + This dedicated worker could not be used again until the Keep Alive + timeout was reached.
+ +
SQL Database Support
+
mod_dbd, together with the apr_dbd + framework, brings direct SQL support to modules that need it. + Supports connection pooling in threaded MPMs.
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Module Enhancements

+ +
+
Authn/Authz
+
Modules in the aaa directory have been renamed and offer + better support for digest authentication. For example, + mod_auth is now split into + mod_auth_basic and + mod_authn_file; mod_auth_dbm is now + called mod_authn_dbm; mod_access has + been renamed mod_authz_host. There is also a new + mod_authn_alias(already removed from 2.3/2.4) module for simplifying + certain authentication configurations. +
+ +
mod_authnz_ldap
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This module is a port of the 2.0 + mod_auth_ldap module to the 2.2 Authn/Authz + framework. New features include using LDAP attribute values and + complicated search filters in the + Require directive.
+ +
mod_authz_owner
+
A new module that authorizes access to files based + on the owner of the file on the file system
+ +
mod_version
+
A new module that allows configuration blocks to be enabled based on the + version number of the running server.
+ +
mod_info
+
Added a new ?config argument which will show + the configuration directives as parsed by Apache, including + their file name and line number. The module also + shows the order of all request hooks and additional + build information, similar to httpd -V.
+ +
mod_ssl
+ +
Added a support for + RFC 2817, which + allows connections to upgrade from clear text to TLS encryption.
+ +
mod_imagemap
+
mod_imap has been renamed to + mod_imagemap to avoid user confusion.
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+

Program Enhancements

+ +
+
httpd
+
A new command line option -M has been added that + lists all modules that are loaded based on the current + configuration. Unlike the -l option, this list + includes DSOs loaded via mod_so.
+ +
httxt2dbm
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A new program used to generate dbm files from text input, + for use in RewriteMap + with the dbm map type.
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+

Module Developer Changes

+ +
+
APR 1.0 API
+ +
Apache 2.2 uses the APR 1.0 API. All deprecated functions and + symbols have been removed from APR and + APR-Util. For details, see the + APR Website.
+ +
Authn/Authz
+
The bundled authentication and authorization modules have + been renamed along the following lines: +
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  • mod_auth_* -> Modules that implement an HTTP + authentication mechanism
    • +
  • mod_authn_* -> Modules that provide a backend + authentication provider
    • +
  • mod_authz_* -> Modules that implement + authorization (or access)
    • +
  • mod_authnz_* -> Module that implements both + authentication & authorization
    • +
+ There is a new authentication backend provider + scheme which greatly eases the construction of new authentication + backends.
+ +
Connection Error Logging
+ +
A new function, ap_log_cerror has been added to log + errors that occur with the client's connection. When logged, + the message includes the client IP address.
+ +
Test Configuration Hook Added
+ +
A new hook, test_config has been added to aid + modules that want to execute special code only when the user passes + -t to httpd.
+ +
Set Threaded MPM's Stacksize
+ +
A new directive, ThreadStackSize has been added to + set the stack size on all threaded MPMs. This is required + for some third-party modules on platforms with small default + thread stack size.
+ +
Protocol handling for output filters
+ +
In the past, every filter has been responsible for ensuring + that it generates the correct response headers where it affects + them. Filters can now delegate common protocol management to + mod_filter, using the + ap_register_output_filter_protocol or + ap_filter_protocol calls.
+ +
Monitor hook added
+
Monitor hook enables modules to run regular/scheduled jobs + in the parent (root) process.
+ +
Regular expression API changes
+ +
The pcreposix.h header is no longer available; + it is replaced by the new ap_regex.h header. The + POSIX.2 regex.h implementation exposed by the old + header is now available under the ap_ namespace + from ap_regex.h. Calls to regcomp, + regexec and so on can be replaced by calls to + ap_regcomp, ap_regexec.
+ +
DBD Framework (SQL Database API)
+ +

With Apache 1.x and 2.0, modules requiring an SQL backend + had to take responsibility for managing it themselves. Apart + from reinventing the wheel, this can be very inefficient, for + example when several modules each maintain their own connections.

+ +

Apache 2.1 and later provides the ap_dbd API for + managing database connections (including optimised strategies + for threaded and unthreaded MPMs), while APR 1.2 and later provides + the apr_dbd API for interacting with the database.

+ +

New modules SHOULD now use these APIs for all SQL database + operations. Existing applications SHOULD be upgraded to use it + where feasible, either transparently or as a recommended option + to their users.

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Available Languages:  en  | + fr  | + ko  | + pt-br  | + tr 

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Comments

Notice:
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