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8 <title>Overview of new features in Apache HTTP Server 2.4 - Apache HTTP Server Version 2.5</title>
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17 <p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
18 <p class="apache">Apache HTTP Server Version 2.5</p>
19 <img alt="" src="./images/feather.gif" /></div>
20 <div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
22 <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.5</a></div><div id="page-content"><div id="preamble"><h1>Overview of new features in Apache HTTP Server 2.4</h1>
24 <p><span>Available Languages: </span><a href="./en/new_features_2_4.html" title="English"> en </a> |
25 <a href="./fr/new_features_2_4.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
26 <a href="./tr/new_features_2_4.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
29 <p>This document describes some of the major changes between the
30 2.2 and 2.4 versions of the Apache HTTP Server. For new features since
31 version 2.0, see the <a href="new_features_2_2.html">2.2 new features</a>
34 <div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#core">Core Enhancements</a></li>
35 <li><img alt="" src="./images/down.gif" /> <a href="#newmods">New Modules</a></li>
36 <li><img alt="" src="./images/down.gif" /> <a href="#module">Module Enhancements</a></li>
37 <li><img alt="" src="./images/down.gif" /> <a href="#programs">Program Enhancements</a></li>
38 <li><img alt="" src="./images/down.gif" /> <a href="#documentation">Documentation</a></li>
39 <li><img alt="" src="./images/down.gif" /> <a href="#developer">Module Developer Changes</a></li>
40 </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
41 <div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
43 <h2><a name="core" id="core">Core Enhancements</a></h2>
46 <dt>Run-time Loadable MPMs</dt>
47 <dd>Multiple MPMs can now be <a href="mpm.html#dynamic">built
48 as loadable modules</a> at compile time.
49 The MPM of choice can be configured at run time.</dd>
52 <dd>The <a href="mod/event.html">Event MPM</a> is no longer experimental
53 but is now fully supported.</dd>
55 <dt>Asynchronous support</dt>
56 <dd>Better support for asynchronous read/write for supporting MPMs and
59 <dt>Per-module and per-directory LogLevel configuration</dt>
60 <dd>The <code class="directive"><a href="./mod/core.html#loglevel">LogLevel</a></code> can now be
61 configured per module and per directory. New levels <code>trace1</code>
62 to <code>trace8</code> have been added above the <code>debug</code> log
65 <dt>Per-request configuration sections</dt>
66 <dd><code class="directive"><a href="./mod/core.html#if"><If></a></code>,
67 <code class="directive"><a href="./mod/core.html#elseif"><ElseIf></a></code>,
68 and <code class="directive"><a href="./mod/core.html#else"><Else></a></code>
69 sections can be used to set the configuration based on per-request
72 <dt>General-purpose expression parser</dt>
73 <dd>A new expression parser allows to specify
74 <a href="expr.html">complex conditions</a> using a common syntax
76 <code class="directive"><a href="./mod/mod_setenvif.html#setenvifexpr">SetEnvIfExpr</a></code>,
77 <code class="directive"><a href="./mod/mod_rewrite.html#rewritecond">RewriteCond</a></code>,
78 <code class="directive"><a href="./mod/mod_headers.html#header">Header</a></code>,
79 <code class="directive"><a href="./mod/core.html#if"><If></a></code>,
83 <dt>KeepAliveTimeout in milliseconds</dt>
84 <dd>It is now possible to specify <code class="directive"><a href="./mod/core.html#keepalivetimeout">KeepAliveTimeout</a></code> in milliseconds.
87 <dt>NameVirtualHost directive</dt>
88 <dd>No longer needed and is now deprecated.</dd>
90 <dt>Override Configuration</dt>
91 <dd>The new <code class="directive"><a href="./mod/core.html#allowoverridelist">AllowOverrideList</a></code>
92 directive allows more fine grained control which directives are
93 allowed in <code>.htaccess</code> files. </dd>
95 <dt>Config file variables</dt>
96 <dd>It is now possible to <code class="directive"><a href="./mod/core.html#define">Define</a></code>
97 variables in the configuration, allowing a clearer representation
98 if the same value is used at many places in the configuration.
101 <dt>Reduced memory usage</dt>
102 <dd>Despite many new features, 2.4.x tends to use less memory than
106 </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
107 <div class="section">
108 <h2><a name="newmods" id="newmods">New Modules</a></h2>
111 <dt><code class="module"><a href="./mod/mod_proxy_fcgi.html">mod_proxy_fcgi</a></code></dt>
112 <dd>FastCGI Protocol backend for <code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code></dd>
114 <dt><code class="module"><a href="./mod/mod_proxy_scgi.html">mod_proxy_scgi</a></code></dt>
115 <dd>SCGI Protocol backend for <code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code></dd>
117 <dt><code class="module"><a href="./mod/mod_proxy_express.html">mod_proxy_express</a></code></dt>
118 <dd>Provides dynamically configured mass reverse proxies for
119 <code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code></dd>
121 <dt><code class="module"><a href="./mod/mod_remoteip.html">mod_remoteip</a></code></dt>
122 <dd>Replaces the apparent client remote IP address and hostname for the request
123 with the IP address list presented by a proxies or a load balancer via
124 the request headers.</dd>
126 <dt><code class="module"><a href="./mod/mod_heartmonitor.html">mod_heartmonitor</a></code>,
127 <code class="module"><a href="./mod/mod_lbmethod_heartbeat.html">mod_lbmethod_heartbeat</a></code></dt>
128 <dd>Allow <code class="module"><a href="./mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> to base loadbalancing decisions
129 on the number of active connections on the backend servers.</dd>
131 <dt><code class="module"><a href="./mod/mod_proxy_html.html">mod_proxy_html</a></code></dt>
132 <dd>Formerly a third-party module, this supports fixing of HTML
133 links in a reverse proxy situation, where the backend generates
134 URLs that are not valid for the proxy's clients.</dd>
136 <dt><code class="module"><a href="./mod/mod_sed.html">mod_sed</a></code></dt>
137 <dd>An advanced replacement of <code class="module"><a href="./mod/mod_substitute.html">mod_substitute</a></code>, allows
138 to edit the response body with the full power of sed.</dd>
140 <dt><code class="module"><a href="./mod/mod_auth_form.html">mod_auth_form</a></code></dt>
141 <dd>Enables form-based authentication.</dd>
143 <dt><code class="module"><a href="./mod/mod_session.html">mod_session</a></code></dt>
144 <dd>Enables the use of session state for clients, using cookie or
145 database storage.</dd>
147 <dt><code class="module"><a href="./mod/mod_allowmethods.html">mod_allowmethods</a></code></dt>
148 <dd>New module to restrict certain HTTP methods without interfering with
149 authentication or authorization.</dd>
151 <dt><code class="module"><a href="./mod/mod_lua.html">mod_lua</a></code></dt>
152 <dd>Embeds the <a href="http://www.lua.org/">Lua</a> language into httpd,
153 for configuration and small business logic functions. (Experimental)</dd>
155 <dt><code class="module"><a href="./mod/mod_log_debug.html">mod_log_debug</a></code></dt>
156 <dd>Allows the addition of customizable debug logging at different phases of the
157 request processing.</dd>
159 <dt><code class="module"><a href="./mod/mod_buffer.html">mod_buffer</a></code></dt>
160 <dd>Provides for buffering the input and output filter stacks</dd>
162 <dt><code class="module"><a href="./mod/mod_data.html">mod_data</a></code></dt>
163 <dd>Convert response body into an RFC2397 data URL</dd>
165 <dt><code class="module"><a href="./mod/mod_ratelimit.html">mod_ratelimit</a></code></dt>
166 <dd>Provides Bandwidth Rate Limiting for Clients</dd>
168 <dt><code class="module"><a href="./mod/mod_request.html">mod_request</a></code></dt>
169 <dd>Provides Filters to handle and make available HTTP request bodies</dd>
171 <dt><code class="module"><a href="./mod/mod_reflector.html">mod_reflector</a></code></dt>
172 <dd>Provides Reflection of a request body as a response via the output filter stack.</dd>
174 <dt><code class="module"><a href="./mod/mod_slotmem_shm.html">mod_slotmem_shm</a></code></dt>
175 <dd>Provides a Slot-based shared memory provider (ala the scoreboard).</dd>
177 <dt><code class="module"><a href="./mod/mod_xml2enc.html">mod_xml2enc</a></code></dt>
178 <dd>Formerly a third-party module, this supports internationalisation
179 in libxml2-based (markup-aware) filter modules.</dd>
181 <dt><code class="module"><a href="./mod/mod_macro.html">mod_macro</a></code> (available since 2.4.5)</dt>
182 <dd>Provide macros within configuration files.</dd>
184 <dt><code class="module"><a href="./mod/mod_proxy_wstunnel.html">mod_proxy_wstunnel</a></code> (available since 2.4.5)</dt>
185 <dd>Support web-socket tunnels.</dd>
187 <dt><code class="module"><a href="./mod/mod_authnz_fcgi.html">mod_authnz_fcgi</a></code> (available since 2.4.10)</dt>
188 <dd>Enable FastCGI authorizer applications to authenticate and/or
189 authorize clients.</dd>
192 </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
193 <div class="section">
194 <h2><a name="module" id="module">Module Enhancements</a></h2>
197 <dt><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code></dt>
199 <dd><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> can now be configured to use an
200 OCSP server to check the validation status of a client
201 certificate. The default responder is configurable, along with
202 the decision on whether to prefer the responder designated in
203 the client certificate itself.</dd>
205 <dd><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> now also supports OCSP stapling, where the
206 server pro-actively obtains an OCSP verification of its certificate and
207 transmits that to the client during the handshake. </dd>
209 <dd><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> can now be configured to share SSL Session
210 data between servers through memcached</dd>
212 <dd>EC keys are now supported in addition to RSA and DSA.</dd>
214 <dd>Support for TLS-SRP (available in 2.4.4 and later).</dd>
216 <dt><code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code></dt>
218 <dd>The <code class="directive"><a href="./mod/mod_proxy.html#proxypass">ProxyPass</a></code> directive
219 is now most optimally configured within a
220 <code class="directive"><a href="./mod/core.html#location">Location</a></code> or
221 <code class="directive"><a href="./mod/core.html#locationmatch">LocationMatch</a></code>
222 block, and offers a significant performance advantage over the traditional
223 two-parameter syntax when present in large numbers.</dd>
224 <dd>The source address used for proxy requests is now configurable.</dd>
225 <dd>Support for Unix domain sockets to the backend (available in 2.4.7
228 <dt><code class="module"><a href="./mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code></dt>
230 <dd>More runtime configuration changes for BalancerMembers via balancer-manager</dd>
232 <dd>Additional BalancerMembers can be added at runtime via balancer-manager</dd>
234 <dd>Runtime configuration of a subset of Balancer parameters</dd>
236 <dd>BalancerMembers can be set to 'Drain' so that they only respond to existing sticky
237 sessions, allowing them to be taken gracefully offline.</dd>
239 <dd>Balancer settings can be persistent after restarts.</dd>
241 <dt><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code></dt>
243 <dd>The <code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> CACHE filter can be optionally inserted
244 at a given point in the filter chain to provide fine control over caching.
247 <dd><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> can now cache HEAD requests.</dd>
249 <dd>Where possible, <code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> directives can now be set
250 per directory, instead of per server.</dd>
252 <dd>The base URL of cached URLs can be customised, so that a cluster of
253 caches can share the same endpoint URL prefix.</dd>
255 <dd><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> is now capable of serving stale cached
256 data when a backend is unavailable (error 5xx).</dd>
258 <dd><code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> can now insert HIT/MISS/REVALIDATE into
259 an X-Cache header.</dd>
261 <dt><code class="module"><a href="./mod/mod_include.html">mod_include</a></code></dt>
262 <dd>Support for the 'onerror' attribute within an 'include' element,
263 allowing an error document to be served on error instead of the default
266 <dt><code class="module"><a href="./mod/mod_cgi.html">mod_cgi</a></code>, <code class="module"><a href="./mod/mod_include.html">mod_include</a></code>,
267 <code class="module"><a href="./mod/mod_isapi.html">mod_isapi</a></code>, ...</dt>
268 <dd>Translation of headers to environment variables is more strict than
269 before to mitigate some possible cross-site-scripting attacks via header
270 injection. Headers containing invalid characters (including underscores)
271 are now silently dropped. <a href="env.html">Environment Variables
272 in Apache</a> has some pointers on how to work around broken legacy
273 clients which require such headers. (This affects all modules which
274 use these environment variables.)</dd>
276 <dt><code class="module"><a href="./mod/mod_authz_core.html">mod_authz_core</a></code> Authorization Logic Containers</dt>
278 <dd>Advanced authorization logic may now be specified using the
279 <code class="directive"><a href="./mod/mod_authz_core.html#require">Require</a></code> directive
280 and the related container directives, such as
281 <code class="directive"><a href="./mod/mod_authz_core.html#requireall"><RequireAll></a></code>.</dd>
283 <dt><code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code></dt>
284 <dd><code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code> adds the <code>[QSD]</code>
285 (Query String Discard) and <code>[END]</code> flags for
286 <code class="directive"><a href="./mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> to
287 simplify common rewriting scenarios.</dd>
288 <dd>Adds the possibility to use complex boolean expressions in <code class="directive"><a href="./mod/mod_rewrite.html#rewritecond">RewriteCond</a></code>.</dd>
289 <dd>Allows the use of SQL queries as <code class="directive"><a href="./mod/mod_rewrite.html#rewritemap">RewriteMap</a></code> functions.</dd>
291 <dt><code class="module"><a href="./mod/mod_ldap.html">mod_ldap</a></code>, <code class="module"><a href="./mod/mod_authnz_ldap.html">mod_authnz_ldap</a></code></dt>
292 <dd><code class="module"><a href="./mod/mod_authnz_ldap.html">mod_authnz_ldap</a></code> adds support for nested groups.</dd>
293 <dd><code class="module"><a href="./mod/mod_ldap.html">mod_ldap</a></code> adds
294 <code class="directive"><a href="./mod/mod_ldap.html#ldapconnectionpoolttl">LDAPConnectionPoolTTL</a></code>,
295 <code class="directive"><a href="./mod/mod_ldap.html#ldaptimeout">LDAPTimeout</a></code>, and
296 other improvements in the handling of timeouts.
297 This is especially useful for setups where a
298 stateful firewall drops idle connections to the LDAP server.</dd>
299 <dd><code class="module"><a href="./mod/mod_ldap.html">mod_ldap</a></code> adds
300 <code class="directive"><a href="./mod/mod_ldap.html#ldaplibrarydebug">LDAPLibraryDebug</a></code> to log
301 debug information provided by the used LDAP toolkit.</dd>
303 <dt><code class="module"><a href="./mod/mod_info.html">mod_info</a></code></dt>
304 <dd><code class="module"><a href="./mod/mod_info.html">mod_info</a></code> can now dump the pre-parsed configuration
305 to stdout during server startup.</dd>
307 <dt><code class="module"><a href="./mod/mod_auth_basic.html">mod_auth_basic</a></code></dt>
308 <dd>New generic mechanism to fake basic authentication (available in
309 2.4.5 and later).</dd>
312 </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
313 <div class="section">
314 <h2><a name="programs" id="programs">Program Enhancements</a></h2>
317 <dt><code class="program"><a href="./programs/fcgistarter.html">fcgistarter</a></code></dt>
318 <dd>New FastCGI deamon starter utility</dd>
320 <dt><code class="program"><a href="./programs/htcacheclean.html">htcacheclean</a></code></dt>
321 <dd>Current cached URLs can now be listed, with optional metadata
323 <dd>Allow explicit deletion of individual cached URLs from the
325 <dd>File sizes can now be rounded up to the given block size, making
326 the size limits map more closely to the real size on disk.</dd>
327 <dd>Cache size can now be limited by the number of inodes, instead
328 of or in addition to being limited by the size of the files on
331 <dt><code class="program"><a href="./programs/rotatelogs.html">rotatelogs</a></code></dt>
332 <dd>May now create a link to the current log file.</dd>
333 <dd>May now invoke a custom post-rotate script.</dd>
335 <dt><code class="program"><a href="./programs/htpasswd.html">htpasswd</a></code>, <code class="program"><a href="./programs/htdbm.html">htdbm</a></code></dt>
336 <dd>Support for the bcrypt algorithm (available in 2.4.4 and later).
339 </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
340 <div class="section">
341 <h2><a name="documentation" id="documentation">Documentation</a></h2>
345 <dd>The <code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code> documentation has been
346 rearranged and almost completely rewritten, with a focus on
347 examples and common usage, as well as on showing you when other
348 solutions are more appropriate. The <a href="rewrite/">Rewrite
349 Guide</a> is now a top-level section with much more detail and
350 better organization.</dd>
353 <dd>The <code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> documentation has been greatly
354 enhanced, with more examples at the getting started level, in
355 addition to the previous focus on technical details.</dd>
357 <dt>Caching Guide</dt>
358 <dd>The <a href="caching.html">Caching Guide</a> has been rewritten
359 to properly distinguish between the RFC2616 HTTP/1.1 caching
360 features provided by <code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code>, and the generic
361 key/value caching provided by the <a href="socache.html">socache</a>
362 interface, as well as to cover specialised caching provided by
363 mechanisms such as <code class="module"><a href="./mod/mod_file_cache.html">mod_file_cache</a></code>.</dd>
366 </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
367 <div class="section">
368 <h2><a name="developer" id="developer">Module Developer Changes</a></h2>
371 <dt>Check Configuration Hook Added</dt>
373 <dd>A new hook, <code>check_config</code>, has been added which runs
374 between the <code>pre_config</code> and <code>open_logs</code>
375 hooks. It also runs before the <code>test_config</code> hook
376 when the <code>-t</code> option is passed to
377 <code class="program"><a href="./programs/httpd.html">httpd</a></code>. The <code>check_config</code> hook
378 allows modules to review interdependent configuration directive
379 values and adjust them while messages can still be logged to the
380 console. The user can thus be alerted to misconfiguration problems
381 before the core <code>open_logs</code> hook function redirects
382 console output to the error log.</dd>
384 <dt>Expression Parser Added</dt>
386 <dd>We now have a general-purpose expression parser, whose API is
387 exposed in <var>ap_expr.h</var>. This is adapted from the
388 expression parser previously implemented in
389 <code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code>.</dd>
391 <dt>Authorization Logic Containers</dt>
393 <dd>Authorization modules now register as a provider, via
394 ap_register_auth_provider(), to support advanced authorization logic,
395 such as <code class="directive"><a href="./mod/mod_authz_core.html#requireall"><RequireAll></a></code>.</dd>
397 <dt>Small-Object Caching Interface</dt>
399 <dd>The <var>ap_socache.h</var> header exposes a provider-based
400 interface for caching small data objects, based on the previous
401 implementation of the <code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code> session cache.
402 Providers using a shared-memory cyclic buffer, disk-based dbm
403 files, and a memcache distributed cache are currently
406 <dt>Cache Status Hook Added</dt>
408 <dd>The <code class="module"><a href="./mod/mod_cache.html">mod_cache</a></code> module now includes a new
409 <code>cache_status</code> hook, which is called when the caching
410 decision becomes known. A default implementation is provided
411 which adds an optional <code>X-Cache</code> and
412 <code>X-Cache-Detail</code> header to the response.</dd>
415 <p>The developer documentation contains a
416 <a href="developer/new_api_2_4.html">detailed list of API changes</a>.</p>
418 <div class="bottomlang">
419 <p><span>Available Languages: </span><a href="./en/new_features_2_4.html" title="English"> en </a> |
420 <a href="./fr/new_features_2_4.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
421 <a href="./tr/new_features_2_4.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
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