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Apache HTTP Server Documentation Version 2.4
Apache Software Foundation
July 12, 2015
iiAbout The PDF Documentation
Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NO-
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file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
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http://httpd.apache.org/docs/2.4/The Apache HTTP Server Documentation is maintained by the Apache HTTP Server Documentation Project. More
information is available at http://httpd.apache.or g/docs-project/Contents
1 Release Notes1
1.1 Upgrading to 2.4 from 2.2
21.2 Overview of new features in Apache HTTP Server 2.4
71.3 Overview of new features in Apache HTTP Server 2.2
111.4 Overview of new features in Apache HTTP Server 2.0
141.5 The Apache License, Version 2.0
162 Using the Apache HTTP Server
192.1 Compiling and Installing
202.2 Starting Apache
252.3 Stopping and Restarting Apache HTTP Server
272.4 Configuration Files
302.5 Configuration Sections
332.6 Caching Guide
402.7 Server-Wide Configuration
512.8 Log Files
532.9 Mapping URLs to Filesystem Locations
612.10 Dynamic Shared Object (DSO) Support
652.11 Content Negotiation
682.12 Custom Error Responses
752.13 Binding to Addresses and Ports
782.14 Multi-Processing Modules (MPMs)
802.15 Environment Variables in Apache
822.16 Expressions in Apache HTTP Server
892.17 Apache"s Handler Use
982.18 Filters
1002.19 Shared Object Cache in Apache HTTP Server
1042.20 suEXEC Support
1052.21 Issues Regarding DNS and Apache HTTP Server
111iii ivCONTENTS
3 Apache Virtual Host documentation
1133.1 Apache Virtual Host documentation
1143.2 Name-based Virtual Host Support
1153.3 Apache IP-based Virtual Host Support
1183.4 Dynamically Configured Mass Virtual Hosting
1203.5 VirtualHost Examples
1243.6 An In-Depth Discussion of Virtual Host Matching
1313.7 File Descriptor Limits
1344 URL Rewriting Guide135
4.1 Apache modrewrite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
4.2 Apache modrewrite Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
4.3 Redirecting and Remapping with modrewrite. . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
4.4 Using modrewrite to control access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
4.5 Dynamic mass virtual hosts with modrewrite. . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
4.6 Using modrewrite for Proxying. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
4.7 Using RewriteMap
1564.8 Advanced Techniques with modrewrite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
4.9 When not to use modrewrite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
4.10 RewriteRule Flags
1684.11 Apache modrewrite Technical Details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
5 Apache SSL/TLS Encryption
1815.1 Apache SSL/TLS Encryption
1825.2 SSL/TLS Strong Encryption: An Introduction
1835.3 SSL/TLS Strong Encryption: Compatibility
1925.4 SSL/TLS Strong Encryption: How-To
1965.5 SSL/TLS Strong Encryption: FAQ
2026 Guides, Tutorials, and HowTos
2156.1 How-To / Tutorials
2166.2 Authentication and Authorization
2176.3 Access Control
2246.4 Apache Tutorial: Dynamic Content with CGI
2266.5 Apache httpd Tutorial: Introduction to Server Side Includes
2336.6 Apache HTTP Server Tutorial: .htaccess files
2396.7 Per-user web directories
245CONTENTSv
7 Platform-specific Notes249
7.1 Platform Specific Notes
2507.2 Using Apache HTTP Server on Microsoft Windows
2517.3 Compiling Apache for Microsoft Windows
2597.4 Using Apache With RPM Based Systems (Redhat / CentOS / Fedora)
2657.5 Using Apache With Novell NetWare
2687.6 Running a High-Performance Web Server on HPUX
2767.7 The Apache EBCDIC Port
2778 Apache HTTP Server and Supporting Programs
2818.1 Server and Supporting Programs
2828.2 httpd - Apache Hypertext Transfer Protocol Server
2838.3 ab - Apache HTTP server benchmarking tool
2858.4 apachectl - Apache HTTP Server Control Interface
2898.5 apxs - APache eXtenSion tool
2918.6 configure - Configure the source tree
2958.7 dbmmanage - Manage user authentication files in DBM format
3038.8 fcgistarter - Start a FastCGI program
3058.9 htcacheclean - Clean up the disk cache
3068.10 htdbm - Manipulate DBM password databases
3088.11 htdigest - manage user files for digest authentication
3118.12 htpasswd - Manage user files for basic authentication
3128.13 httxt2dbm - Generate dbm files for use with RewriteMap
3158.14 logresolve - Resolve IP-addresses to hostnames in Apache log files
3168.15 logserverstatus - Log periodic status summaries. . . . . . . . . . . . . . . . . . . . . . . . . . 317
8.16 rotatelogs - Piped logging program to rotate Apache logs
3188.17 split-logfile - Split up multi-vhost logfiles
3218.18 suexec - Switch user before executing external programs
3228.19 Other Programs
3239 Apache Miscellaneous Documentation
3259.1 Apache Miscellaneous Documentation
3269.2 Apache Performance Tuning
3279.3 Security Tips
3389.4 Relevant Standards
3439.5 Password Formats
345viCONTENTS
10 Apache modules349
10.1 Terms Used to Describe Modules
35010.2 Terms Used to Describe Directives
35110.3 Apache Module core
35410.4 Apache Module modaccesscompat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410
10.5 Apache Module modactions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
10.6 Apache Module modalias. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417
10.7 Apache Module modallowmethods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
10.8 Apache Module modasis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
10.9 Apache Module modauthbasic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426
10.10 Apache Module modauthdigest. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430
10.11 Apache Module modauthform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
10.12 Apache Module modauthnanon. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445
10.13 Apache Module modauthncore. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 448
10.14 Apache Module modauthndbd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452
10.15 Apache Module modauthndbm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
10.16 Apache Module modauthnfile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 457
10.17 Apache Module modauthnsocache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459
10.18 Apache Module modauthnzfcgi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462
10.19 Apache Module modauthnzldap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469
10.20 Apache Module modauthzcore. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487
10.21 Apache Module modauthzdbd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495
10.22 Apache Module modauthzdbm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499
10.23 Apache Module modauthzgroupfile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 502
10.24 Apache Module modauthzhost. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504
10.25 Apache Module modauthzowner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
10.26 Apache Module modauthzuser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509
10.27 Apache Module modautoindex. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510
10.28 Apache Module modbuffer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 522
10.29 Apache Module modcache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523
10.30 Apache Module modcachedisk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 538
10.31 Apache Module modcachesocache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 542
10.32 Apache Module modcernmeta. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 546
10.33 Apache Module modcgi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 548
10.34 Apache Module modcgid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 551
10.35 Apache Module modcharsetlite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 553
10.36 Apache Module moddata. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 556
CONTENTSvii
10.37 Apache Module moddav. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 557
10.38 Apache Module moddavfs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 560
10.39 Apache Module moddavlock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 561
10.40 Apache Module moddbd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 562
10.41 Apache Module moddeflate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567
10.42 Apache Module moddialup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 573
10.43 Apache Module moddir. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 574
10.44 Apache Module moddumpio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 579
10.45 Apache Module modecho. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 581
10.46 Apache Module modenv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 582
10.47 Apache Module modexamplehooks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 584
10.48 Apache Module modexpires. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 586
10.49 Apache Module modextfilter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589
10.50 Apache Module modfilecache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 593
10.51 Apache Module modfilter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596
10.52 Apache Module modheaders. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604
10.53 Apache Module modheartbeat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610
10.54 Apache Module modheartmonitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 611
10.55 Apache Module modident. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 613
10.56 Apache Module modimagemap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 615
10.57 Apache Module modinclude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 619
10.58 Apache Module modinfo. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632
10.59 Apache Module modisapi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635
10.60 Apache Module modlbmethodbybusyness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639
10.61 Apache Module modlbmethodbyrequests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 640
10.62 Apache Module modlbmethodbytraffic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642
10.63 Apache Module modlbmethodheartbeat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 643
10.64 Apache Module modldap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644
10.65 Apache Module modlogconfig. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 656
10.66 Apache Module modlogdebug. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 662
10.67 Apache Module modlogforensic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664
10.68 Apache Module modlogio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 666
10.69 Apache Module modlua. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 668
10.70 Apache Module modmacro. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695
10.71 Apache Module modmime. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 699
10.72 Apache Module modmimemagic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 712
10.73 Apache Module modnegotiation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 716
viiiCONTENTS10.74 Apache Module modnwssl. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 720
10.75 Apache Module modprivileges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 721
10.76 Apache Module modproxy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 727
10.77 Apache Module modproxyajp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 753
10.78 Apache Module modproxybalancer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 762
10.79 Apache Module modproxyconnect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 766
10.80 Apache Module modproxyexpress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 767
10.81 Apache Module modproxyfcgi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 770
10.82 Apache Module modproxyfdpass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 773
10.83 Apache Module modproxyftp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 774
10.84 Apache Module modproxyhtml. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 777
10.85 Apache Module modproxyhttp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 783
10.86 Apache Module modproxyscgi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 785
10.87 Apache Module modproxywstunnel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 788
10.88 Apache Module modratelimit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 789
10.89 Apache Module modreflector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 790
10.90 Apache Module modremoteip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 791
10.91 Apache Module modreqtimeout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 795
10.92 Apache Module modrequest. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 797
10.93 Apache Module modrewrite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 798
10.94 Apache Module modsed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 812
10.95 Apache Module modsession. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 814
10.96 Apache Module modsessioncookie. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 821
10.97 Apache Module modsessioncrypto. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 824
10.98 Apache Module modsessiondbd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 828
10.99 Apache Module modsetenvif. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 833
10.100 Apache Module modslotmemplain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 837
10.101 Apache Module modslotmemshm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 838
10.102 Apache Module modso. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 839
10.103 Apache Module modsocachedbm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 841
10.104 Apache Module modsocachedc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 842
10.105 Apache Module modsocachememcache. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 843
10.106 Apache Module modsocacheshmcb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 844
10.107 Apache Module modspeling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 845
10.108 Apache Module modssl. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 847
10.109 Apache Module modstatus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 885
10.110 Apache Module modsubstitute. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 887
CONTENTSix
10.111 Apache Module modsuexec. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 889
10.112 Apache Module moduniqueid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 890
10.113 Apache Module modunixd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 892
10.114 Apache Module moduserdir. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 895
10.115 Apache Module modusertrack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 897
10.116 Apache Module modversion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900
10.117 Apache Module modvhostalias. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 902
10.118 Apache Module modwatchdog. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 906
10.119 Apache Module modxml2enc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907
10.120 Apache Module mpmcommon. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 910
10.121 Apache Module event
92010.122 Apache Module mpmnetware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 923
10.123 Apache Module mpmtos2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 925
10.124 Apache Module prefork
92610.125 Apache Module mpmwinnt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 929
10.126 Apache Module worker
93111 Developer Documentation933
11.1 Developer Documentation for the Apache HTTP Server 2.4
93411.2 Apache 1.3 API notes
93511.3 API Changes in Apache HTTP Server 2.4 since 2.2
95111.4 Developing modules for the Apache HTTP Server 2.4
95811.5 Documenting code in Apache 2.4
98611.6 Hook Functions in the Apache HTTP Server 2.x
98711.7 Converting Modules from Apache 1.3 to Apache 2.0
99011.8 Request Processing in the Apache HTTP Server 2.x
99411.9 How filters work in Apache 2.0
99711.10 Guide to writing output filters
100011.11 Apache HTTP Server 2.x Thread Safety Issues
100712 Glossary and Index1011
12.1 Glossary
101212.2 Module Index
101712.3 Directive Quick Reference
1022xCONTENTS
Chapter 1
Release Notes
12CHAPTER 1. RELEASE NOTES
1.1 Upgrading to 2.4 from 2.2
In order to assist folks upgrading, we maintain a document describing information critical to existing Apache HTTP
Server users. These are intended to be brief notes, and you should be able to find more information in either the New
Features (p.
7 ) document, or in thesrc/CHANGESfile. Application and module developers can find a summary ofAPI changes in the API updates (p.
951) overview.
This document describes changes in server behavior that might require you to change your configuration or how you
use the server in order to continue using 2.4 as you are currently using 2.2. To take advantage of new features in 2.4,
see the New Features document.This document describes only the changes from 2.2 to 2.4. If you are upgrading from version 2.0, you should also
consult the 2.0 to 2.2 upgrading document. 1See also
Overview of new features in Apache HTTP Server 2.4 (p.7 )Compile-Time Configuration Changes
The compilation process is very similar to the one used in version 2.2. Your oldconfigurecommand line (as found
inbuild/config.nicein the installed server directory) can be used in most cases. There are some changes in
the default settings. Some details of changes: These modules have been removed: modauthndefault, modauthzdefault, modmemcache. If you were using modmemcache in 2.2, look atMODCACHEDISKin 2.4.All load balancing implementations have been moved to individual, self-contained modproxy submodules, e.g.
MODLBMETHODBYBUSYNESS. You might need to build and load any of these that your configuration uses.Platform support has been removed for BeOS, TPF, and even older platforms such as A/UX, Next, and Tandem.
These were believed to be broken anyway.
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