Linux ip-172-26-2-223 5.4.0-1018-aws #18-Ubuntu SMP Wed Jun 24 01:15:00 UTC 2020 x86_64
Apache
: 172.26.2.223 | : 18.223.109.25
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8.1.13
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www /
server /
apache /
manual /
mod /
[ HOME SHELL ]
Name
Size
Permission
Action
core.html
535
B
-rw-r--r--
core.html.de
238.47
KB
-rw-r--r--
core.html.en
293.44
KB
-rw-r--r--
core.html.es
262.51
KB
-rw-r--r--
core.html.fr.utf8
324.56
KB
-rw-r--r--
core.html.ja.utf8
254.26
KB
-rw-r--r--
core.html.tr.utf8
313.84
KB
-rw-r--r--
directive-dict.html
598
B
-rw-r--r--
directive-dict.html.en
17.79
KB
-rw-r--r--
directive-dict.html.es
19.47
KB
-rw-r--r--
directive-dict.html.fr.utf8
19.11
KB
-rw-r--r--
directive-dict.html.ja.utf8
20.06
KB
-rw-r--r--
directive-dict.html.ko.euc-kr
15.65
KB
-rw-r--r--
directive-dict.html.tr.utf8
19.11
KB
-rw-r--r--
directives.html
760
B
-rw-r--r--
directives.html.de
57.67
KB
-rw-r--r--
directives.html.en
57.54
KB
-rw-r--r--
directives.html.es
57.83
KB
-rw-r--r--
directives.html.fr.utf8
57.65
KB
-rw-r--r--
directives.html.ja.utf8
57.74
KB
-rw-r--r--
directives.html.ko.euc-kr
57.39
KB
-rw-r--r--
directives.html.tr.utf8
57.57
KB
-rw-r--r--
directives.html.zh-cn.utf8
57.41
KB
-rw-r--r--
event.html
201
B
-rw-r--r--
event.html.en
28.84
KB
-rw-r--r--
event.html.fr.utf8
31.36
KB
-rw-r--r--
index.html
720
B
-rw-r--r--
index.html.de
23.21
KB
-rw-r--r--
index.html.en
22.93
KB
-rw-r--r--
index.html.es
23.49
KB
-rw-r--r--
index.html.fr.utf8
25.14
KB
-rw-r--r--
index.html.ja.utf8
24.2
KB
-rw-r--r--
index.html.ko.euc-kr
22.37
KB
-rw-r--r--
index.html.tr.utf8
23.2
KB
-rw-r--r--
index.html.zh-cn.utf8
22.81
KB
-rw-r--r--
mod_access_compat.html
322
B
-rw-r--r--
mod_access_compat.html.en
28.41
KB
-rw-r--r--
mod_access_compat.html.fr.utf8
31.22
KB
-rw-r--r--
mod_access_compat.html.ja.utf8
30.51
KB
-rw-r--r--
mod_actions.html
489
B
-rw-r--r--
mod_actions.html.de
13.78
KB
-rw-r--r--
mod_actions.html.en
12.72
KB
-rw-r--r--
mod_actions.html.fr.utf8
13.32
KB
-rw-r--r--
mod_actions.html.ja.utf8
14.43
KB
-rw-r--r--
mod_actions.html.ko.euc-kr
12.37
KB
-rw-r--r--
mod_alias.html
479
B
-rw-r--r--
mod_alias.html.en
36.82
KB
-rw-r--r--
mod_alias.html.fr.utf8
40.04
KB
-rw-r--r--
mod_alias.html.ja.utf8
28.55
KB
-rw-r--r--
mod_alias.html.ko.euc-kr
22.95
KB
-rw-r--r--
mod_alias.html.tr.utf8
39.33
KB
-rw-r--r--
mod_allowmethods.html
223
B
-rw-r--r--
mod_allowmethods.html.en
8.09
KB
-rw-r--r--
mod_allowmethods.html.fr.utf8
8.4
KB
-rw-r--r--
mod_asis.html
386
B
-rw-r--r--
mod_asis.html.en
8.9
KB
-rw-r--r--
mod_asis.html.fr.utf8
9.18
KB
-rw-r--r--
mod_asis.html.ja.utf8
9.74
KB
-rw-r--r--
mod_asis.html.ko.euc-kr
8.47
KB
-rw-r--r--
mod_auth_basic.html
410
B
-rw-r--r--
mod_auth_basic.html.en
19.57
KB
-rw-r--r--
mod_auth_basic.html.fr.utf8
21.6
KB
-rw-r--r--
mod_auth_basic.html.ja.utf8
16.32
KB
-rw-r--r--
mod_auth_basic.html.ko.euc-kr
13.84
KB
-rw-r--r--
mod_auth_digest.html
319
B
-rw-r--r--
mod_auth_digest.html.en
20.11
KB
-rw-r--r--
mod_auth_digest.html.fr.utf8
21.9
KB
-rw-r--r--
mod_auth_digest.html.ko.euc-kr
20.41
KB
-rw-r--r--
mod_auth_form.html
217
B
-rw-r--r--
mod_auth_form.html.en
50.41
KB
-rw-r--r--
mod_auth_form.html.fr.utf8
54.73
KB
-rw-r--r--
mod_authn_anon.html
410
B
-rw-r--r--
mod_authn_anon.html.en
16.5
KB
-rw-r--r--
mod_authn_anon.html.fr.utf8
17.97
KB
-rw-r--r--
mod_authn_anon.html.ja.utf8
18.47
KB
-rw-r--r--
mod_authn_anon.html.ko.euc-kr
16.05
KB
-rw-r--r--
mod_authn_core.html
219
B
-rw-r--r--
mod_authn_core.html.en
16.42
KB
-rw-r--r--
mod_authn_core.html.fr.utf8
17.58
KB
-rw-r--r--
mod_authn_dbd.html
217
B
-rw-r--r--
mod_authn_dbd.html.en
15.09
KB
-rw-r--r--
mod_authn_dbd.html.fr.utf8
16.31
KB
-rw-r--r--
mod_authn_dbm.html
406
B
-rw-r--r--
mod_authn_dbm.html.en
12.69
KB
-rw-r--r--
mod_authn_dbm.html.fr.utf8
13.59
KB
-rw-r--r--
mod_authn_dbm.html.ja.utf8
13.07
KB
-rw-r--r--
mod_authn_dbm.html.ko.euc-kr
11.09
KB
-rw-r--r--
mod_authn_file.html
410
B
-rw-r--r--
mod_authn_file.html.en
11.42
KB
-rw-r--r--
mod_authn_file.html.fr.utf8
12.21
KB
-rw-r--r--
mod_authn_file.html.ja.utf8
12.44
KB
-rw-r--r--
mod_authn_file.html.ko.euc-kr
10.54
KB
-rw-r--r--
mod_authn_socache.html
225
B
-rw-r--r--
mod_authn_socache.html.en
18.82
KB
-rw-r--r--
mod_authn_socache.html.fr.utf8
20.67
KB
-rw-r--r--
mod_authnz_fcgi.html
221
B
-rw-r--r--
mod_authnz_fcgi.html.en
26.98
KB
-rw-r--r--
mod_authnz_fcgi.html.fr.utf8
29.33
KB
-rw-r--r--
mod_authnz_ldap.html
221
B
-rw-r--r--
mod_authnz_ldap.html.en
84.3
KB
-rw-r--r--
mod_authnz_ldap.html.fr.utf8
86.91
KB
-rw-r--r--
mod_authz_core.html
219
B
-rw-r--r--
mod_authz_core.html.en
37.04
KB
-rw-r--r--
mod_authz_core.html.fr.utf8
40.05
KB
-rw-r--r--
mod_authz_dbd.html
217
B
-rw-r--r--
mod_authz_dbd.html.en
18.2
KB
-rw-r--r--
mod_authz_dbd.html.fr.utf8
19.98
KB
-rw-r--r--
mod_authz_dbm.html
313
B
-rw-r--r--
mod_authz_dbm.html.en
12.86
KB
-rw-r--r--
mod_authz_dbm.html.fr.utf8
13.75
KB
-rw-r--r--
mod_authz_dbm.html.ko.euc-kr
10.39
KB
-rw-r--r--
mod_authz_groupfile.html
430
B
-rw-r--r--
mod_authz_groupfile.html.en
10.4
KB
-rw-r--r--
mod_authz_groupfile.html.fr.ut...
10.93
KB
-rw-r--r--
mod_authz_groupfile.html.ja.ut...
9.9
KB
-rw-r--r--
mod_authz_groupfile.html.ko.eu...
8.8
KB
-rw-r--r--
mod_authz_host.html
219
B
-rw-r--r--
mod_authz_host.html.en
13.39
KB
-rw-r--r--
mod_authz_host.html.fr.utf8
14.35
KB
-rw-r--r--
mod_authz_owner.html
414
B
-rw-r--r--
mod_authz_owner.html.en
11.29
KB
-rw-r--r--
mod_authz_owner.html.fr.utf8
11.92
KB
-rw-r--r--
mod_authz_owner.html.ja.utf8
12.93
KB
-rw-r--r--
mod_authz_owner.html.ko.euc-kr
11.1
KB
-rw-r--r--
mod_authz_user.html
410
B
-rw-r--r--
mod_authz_user.html.en
8.11
KB
-rw-r--r--
mod_authz_user.html.fr.utf8
8.37
KB
-rw-r--r--
mod_authz_user.html.ja.utf8
7.39
KB
-rw-r--r--
mod_authz_user.html.ko.euc-kr
6.85
KB
-rw-r--r--
mod_autoindex.html
499
B
-rw-r--r--
mod_autoindex.html.en
60.78
KB
-rw-r--r--
mod_autoindex.html.fr.utf8
67.28
KB
-rw-r--r--
mod_autoindex.html.ja.utf8
64.92
KB
-rw-r--r--
mod_autoindex.html.ko.euc-kr
50.19
KB
-rw-r--r--
mod_autoindex.html.tr.utf8
66.14
KB
-rw-r--r--
mod_brotli.html
211
B
-rw-r--r--
mod_brotli.html.en
21.14
KB
-rw-r--r--
mod_brotli.html.fr.utf8
22.5
KB
-rw-r--r--
mod_buffer.html
211
B
-rw-r--r--
mod_buffer.html.en
9.06
KB
-rw-r--r--
mod_buffer.html.fr.utf8
9.57
KB
-rw-r--r--
mod_cache.html
390
B
-rw-r--r--
mod_cache.html.en
68.08
KB
-rw-r--r--
mod_cache.html.fr.utf8
74.14
KB
-rw-r--r--
mod_cache.html.ja.utf8
52.35
KB
-rw-r--r--
mod_cache.html.ko.euc-kr
38.51
KB
-rw-r--r--
mod_cache_disk.html
410
B
-rw-r--r--
mod_cache_disk.html.en
20.1
KB
-rw-r--r--
mod_cache_disk.html.fr.utf8
21.26
KB
-rw-r--r--
mod_cache_disk.html.ja.utf8
18.36
KB
-rw-r--r--
mod_cache_disk.html.ko.euc-kr
15.72
KB
-rw-r--r--
mod_cache_socache.html
225
B
-rw-r--r--
mod_cache_socache.html.en
18.28
KB
-rw-r--r--
mod_cache_socache.html.fr.utf8
19.06
KB
-rw-r--r--
mod_cern_meta.html
313
B
-rw-r--r--
mod_cern_meta.html.en
11
KB
-rw-r--r--
mod_cern_meta.html.fr.utf8
11.56
KB
-rw-r--r--
mod_cern_meta.html.ko.euc-kr
10.54
KB
-rw-r--r--
mod_cgi.html
382
B
-rw-r--r--
mod_cgi.html.en
18.42
KB
-rw-r--r--
mod_cgi.html.fr.utf8
20.06
KB
-rw-r--r--
mod_cgi.html.ja.utf8
19.72
KB
-rw-r--r--
mod_cgi.html.ko.euc-kr
16.31
KB
-rw-r--r--
mod_cgid.html
386
B
-rw-r--r--
mod_cgid.html.en
11.56
KB
-rw-r--r--
mod_cgid.html.fr.utf8
12.15
KB
-rw-r--r--
mod_cgid.html.ja.utf8
12.2
KB
-rw-r--r--
mod_cgid.html.ko.euc-kr
10.7
KB
-rw-r--r--
mod_charset_lite.html
322
B
-rw-r--r--
mod_charset_lite.html.en
15.35
KB
-rw-r--r--
mod_charset_lite.html.fr.utf8
16.54
KB
-rw-r--r--
mod_charset_lite.html.ko.euc-k...
14.28
KB
-rw-r--r--
mod_data.html
207
B
-rw-r--r--
mod_data.html.en
7.49
KB
-rw-r--r--
mod_data.html.fr.utf8
7.68
KB
-rw-r--r--
mod_dav.html
382
B
-rw-r--r--
mod_dav.html.en
17.91
KB
-rw-r--r--
mod_dav.html.fr.utf8
19.45
KB
-rw-r--r--
mod_dav.html.ja.utf8
20.66
KB
-rw-r--r--
mod_dav.html.ko.euc-kr
17.71
KB
-rw-r--r--
mod_dav_fs.html
394
B
-rw-r--r--
mod_dav_fs.html.en
10.75
KB
-rw-r--r--
mod_dav_fs.html.fr.utf8
11.4
KB
-rw-r--r--
mod_dav_fs.html.ja.utf8
10.6
KB
-rw-r--r--
mod_dav_fs.html.ko.euc-kr
10.17
KB
-rw-r--r--
mod_dav_lock.html
307
B
-rw-r--r--
mod_dav_lock.html.en
9.76
KB
-rw-r--r--
mod_dav_lock.html.fr.utf8
10.32
KB
-rw-r--r--
mod_dav_lock.html.ja.utf8
10.51
KB
-rw-r--r--
mod_dbd.html
205
B
-rw-r--r--
mod_dbd.html.en
24.71
KB
-rw-r--r--
mod_dbd.html.fr.utf8
26.94
KB
-rw-r--r--
mod_deflate.html
398
B
-rw-r--r--
mod_deflate.html.en
28.35
KB
-rw-r--r--
mod_deflate.html.fr.utf8
30.4
KB
-rw-r--r--
mod_deflate.html.ja.utf8
31.06
KB
-rw-r--r--
mod_deflate.html.ko.euc-kr
26.17
KB
-rw-r--r--
mod_dialup.html
211
B
-rw-r--r--
mod_dialup.html.en
7.49
KB
-rw-r--r--
mod_dialup.html.fr.utf8
7.81
KB
-rw-r--r--
mod_dir.html
469
B
-rw-r--r--
mod_dir.html.en
22.39
KB
-rw-r--r--
mod_dir.html.fr.utf8
24.43
KB
-rw-r--r--
mod_dir.html.ja.utf8
19.66
KB
-rw-r--r--
mod_dir.html.ko.euc-kr
16.53
KB
-rw-r--r--
mod_dir.html.tr.utf8
23.66
KB
-rw-r--r--
mod_dumpio.html
301
B
-rw-r--r--
mod_dumpio.html.en
9.62
KB
-rw-r--r--
mod_dumpio.html.fr.utf8
9.99
KB
-rw-r--r--
mod_dumpio.html.ja.utf8
10.32
KB
-rw-r--r--
mod_echo.html
386
B
-rw-r--r--
mod_echo.html.en
7.44
KB
-rw-r--r--
mod_echo.html.fr.utf8
7.58
KB
-rw-r--r--
mod_echo.html.ja.utf8
7.88
KB
-rw-r--r--
mod_echo.html.ko.euc-kr
7.55
KB
-rw-r--r--
mod_env.html
469
B
-rw-r--r--
mod_env.html.en
11.6
KB
-rw-r--r--
mod_env.html.fr.utf8
12.08
KB
-rw-r--r--
mod_env.html.ja.utf8
11.07
KB
-rw-r--r--
mod_env.html.ko.euc-kr
9.9
KB
-rw-r--r--
mod_env.html.tr.utf8
11.72
KB
-rw-r--r--
mod_example_hooks.html
325
B
-rw-r--r--
mod_example_hooks.html.en
11.2
KB
-rw-r--r--
mod_example_hooks.html.fr.utf8
11.9
KB
-rw-r--r--
mod_example_hooks.html.ko.euc-...
10.76
KB
-rw-r--r--
mod_expires.html
398
B
-rw-r--r--
mod_expires.html.en
16.71
KB
-rw-r--r--
mod_expires.html.fr.utf8
17.81
KB
-rw-r--r--
mod_expires.html.ja.utf8
18.29
KB
-rw-r--r--
mod_expires.html.ko.euc-kr
15.08
KB
-rw-r--r--
mod_ext_filter.html
410
B
-rw-r--r--
mod_ext_filter.html.en
18.22
KB
-rw-r--r--
mod_ext_filter.html.fr.utf8
19.71
KB
-rw-r--r--
mod_ext_filter.html.ja.utf8
22.86
KB
-rw-r--r--
mod_ext_filter.html.ko.euc-kr
18.94
KB
-rw-r--r--
mod_file_cache.html
316
B
-rw-r--r--
mod_file_cache.html.en
15.4
KB
-rw-r--r--
mod_file_cache.html.fr.utf8
17.64
KB
-rw-r--r--
mod_file_cache.html.ko.euc-kr
14.45
KB
-rw-r--r--
mod_filter.html
211
B
-rw-r--r--
mod_filter.html.en
31.22
KB
-rw-r--r--
mod_filter.html.fr.utf8
34.81
KB
-rw-r--r--
mod_headers.html
398
B
-rw-r--r--
mod_headers.html.en
33.85
KB
-rw-r--r--
mod_headers.html.fr.utf8
37.21
KB
-rw-r--r--
mod_headers.html.ja.utf8
25.01
KB
-rw-r--r--
mod_headers.html.ko.euc-kr
19.54
KB
-rw-r--r--
mod_heartbeat.html
217
B
-rw-r--r--
mod_heartbeat.html.en
9.55
KB
-rw-r--r--
mod_heartbeat.html.fr.utf8
9.8
KB
-rw-r--r--
mod_heartmonitor.html
223
B
-rw-r--r--
mod_heartmonitor.html.en
12.12
KB
-rw-r--r--
mod_heartmonitor.html.fr.utf8
12.65
KB
-rw-r--r--
mod_http2.html
209
B
-rw-r--r--
mod_http2.html.en
62.64
KB
-rw-r--r--
mod_http2.html.fr.utf8
66.38
KB
-rw-r--r--
mod_ident.html
390
B
-rw-r--r--
mod_ident.html.en
9.94
KB
-rw-r--r--
mod_ident.html.fr.utf8
10.45
KB
-rw-r--r--
mod_ident.html.ja.utf8
10.88
KB
-rw-r--r--
mod_ident.html.ko.euc-kr
9.47
KB
-rw-r--r--
mod_imagemap.html
310
B
-rw-r--r--
mod_imagemap.html.en
21.22
KB
-rw-r--r--
mod_imagemap.html.fr.utf8
23.4
KB
-rw-r--r--
mod_imagemap.html.ko.euc-kr
19.77
KB
-rw-r--r--
mod_include.html
304
B
-rw-r--r--
mod_include.html.en
59.85
KB
-rw-r--r--
mod_include.html.fr.utf8
65.42
KB
-rw-r--r--
mod_include.html.ja.utf8
55.34
KB
-rw-r--r--
mod_info.html
386
B
-rw-r--r--
mod_info.html.en
14.6
KB
-rw-r--r--
mod_info.html.fr.utf8
15.53
KB
-rw-r--r--
mod_info.html.ja.utf8
15.12
KB
-rw-r--r--
mod_info.html.ko.euc-kr
12.6
KB
-rw-r--r--
mod_isapi.html
301
B
-rw-r--r--
mod_isapi.html.en
23.44
KB
-rw-r--r--
mod_isapi.html.fr.utf8
25.48
KB
-rw-r--r--
mod_isapi.html.ko.euc-kr
21.62
KB
-rw-r--r--
mod_lbmethod_bybusyness.html
237
B
-rw-r--r--
mod_lbmethod_bybusyness.html.e...
7.85
KB
-rw-r--r--
mod_lbmethod_bybusyness.html.f...
8.25
KB
-rw-r--r--
mod_lbmethod_byrequests.html
237
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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> <!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --> <title>mod_proxy_hcheck - Apache HTTP Server Version 2.4</title> <link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> <link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> <link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> <script src="../style/scripts/prettify.min.js" type="text/javascript"> </script> <link href="../images/favicon.ico" rel="shortcut icon" /></head> <body> <div id="page-header"> <p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.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> <p class="apache">Apache HTTP Server Version 2.4</p> <img alt="" src="../images/feather.png" /></div> <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> <div id="path"> <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 2.4</a> > <a href="./">Modules</a></div> <div id="page-content"> <div id="preamble"><h1>Apache Module mod_proxy_hcheck</h1> <div class="toplang"> <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_hcheck.html" title="English"> en </a> | <a href="../fr/mod/mod_proxy_hcheck.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> </div> <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Dynamic health check of Balancer members (workers) for <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr> <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr> <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_hcheck_module</td></tr> <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_hcheck.c</td></tr> <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.4.21 and later</td></tr></table> <h3>Summary</h3> <p>This module provides for dynamic health checking of balancer members (workers). This can be enabled on a worker-by-worker basis. The health check is done independently of the actual reverse proxy requests.</p> <p>This module <em>requires</em> the service of <code class="module"><a href="../mod/mod_watchdog.html">mod_watchdog</a></code>.</p> <div class="note"><h3>Parameters</h3> <p>The health check mechanism is enabled via the use of additional <code class="directive"><a href="../mod/mod_proxy.html#balancermember">BalancerMember</a></code> parameters, which are configured in the standard way via <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>:</p> <p>A new BalancerMember <a href="mod_proxy.html#status_table">status</a> state (flag) is defined via this module: "<code>C</code>". When the worker is taken offline due to failures as determined by the health check module, this flag is set, and can be seen (and modified) via the <code>balancer-manager</code>.</p> <table> <tr><th>Parameter</th> <th>Default</th> <th>Description</th></tr> <tr><td>hcmethod</td> <td>None</td> <td>No dynamic health check performed. Choices are: <table> <tr><th>Method</th><th>Description</th><th>Note</th></tr> <tr><td>None</td><td>No dynamic health checking done</td><td /></tr> <tr><td>TCP</td><td>Check that a socket to the backend can be created: e.g. "are you up"</td><td /></tr> <tr><td>OPTIONS</td><td>Send a <code>HTTP OPTIONS</code> request to the backend via <code>HTTP/1.0</code></td><td>*</td></tr> <tr><td>HEAD</td><td>Send a <code>HTTP HEAD</code> request to the backend via <code>HTTP/1.0</code></td><td>*</td></tr> <tr><td>GET</td><td>Send a <code>HTTP GET</code> request to the backend via <code>HTTP/1.0</code></td><td>*</td></tr> <tr><td>OPTIONS11</td><td>Send a <code>HTTP OPTIONS</code> request to the backend via <code>HTTP/1.1</code></td><td>*</td></tr> <tr><td>HEAD11</td><td>Send a <code>HTTP HEAD</code> request to the backend via <code>HTTP/1.1</code></td><td>*</td></tr> <tr><td>GET11</td><td>Send a <code>HTTP GET</code> request to the backend via <code>HTTP/1.1</code></td><td>*</td></tr> <tr><td colspan="3" /></tr> <tr><td colspan="3">*: Unless <code>hcexpr</code> is used, a 2xx or 3xx HTTP status will be interpreted as <em>passing</em> the health check</td></tr> </table> </td></tr> <tr><td>hcpasses</td> <td>1</td> <td>Number of successful health check tests before worker is re-enabled</td></tr> <tr><td>hcfails</td> <td>1</td> <td>Number of failed health check tests before worker is disabled</td></tr> <tr><td>hcinterval</td> <td>30</td> <td>Period of health checks in seconds (e.g. performed every 30 seconds)</td></tr> <tr><td>hcuri</td> <td> </td> <td>Additional URI to be appended to the worker URL for the health check.</td></tr> <tr><td>hctemplate</td> <td> </td> <td>Name of template, created via <code class="directive"><a href="#proxyhctemplate">ProxyHCTemplate</a></code>, to use for setting health check parameters for this worker</td></tr> <tr><td>hcexpr</td> <td> </td> <td>Name of expression, created via <code class="directive"><a href="#proxyhcexpr">ProxyHCExpr</a></code>, used to check response headers for health.<br /> <em>If not used, 2xx thru 3xx status codes imply success</em></td></tr> </table> </div> <div class="note"><h3>Compatibility:</h3> <p><code>OPTIONS11</code>, <code>HEAD11</code> and <code>GET11</code> are available in 2.4.55 and above.</p> </div> </div> <div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3> <ul id="topics"> <li><img alt="" src="../images/down.gif" /> <a href="#examples">Usage examples</a></li> </ul><h3 class="directives">Directives</h3> <ul id="toc"> <li><img alt="" src="../images/down.gif" /> <a href="#proxyhcexpr">ProxyHCExpr</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#proxyhctemplate">ProxyHCTemplate</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#proxyhctpsize">ProxyHCTPsize</a></li> </ul> <h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_proxy_hcheck">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_proxy_hcheck">Report a bug</a></li></ul><h3>See also</h3> <ul class="seealso"> <li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li> <li><a href="#comments_section">Comments</a></li></ul></div> <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="section"> <h2><a name="examples" id="examples">Usage examples</a></h2> <p>The following example shows how one might configured health checking for various backend servers:</p> <pre class="prettyprint lang-config">ProxyHCExpr ok234 {%{REQUEST_STATUS} =~ /^[234]/} ProxyHCExpr gdown {%{REQUEST_STATUS} =~ /^[5]/} ProxyHCExpr in_maint {hc('body') !~ /Under maintenance/} <Proxy balancer://foo> BalancerMember http://www.example.com/ hcmethod=GET hcexpr=in_maint hcuri=/status.php BalancerMember http://www2.example.com/ hcmethod=HEAD hcexpr=ok234 hcinterval=10 BalancerMember http://www3.example.com/ hcmethod=TCP hcinterval=5 hcpasses=2 hcfails=3 BalancerMember http://www4.example.com/ </Proxy> ProxyPass "/" "balancer://foo" ProxyPassReverse "/" "balancer://foo"</pre> <p>In this scenario, <code>http://www.example.com/</code> is health checked by sending a <code>GET /status.php</code> request to that server and seeing that the returned page does not include the string <em>Under maintenance</em>. If it does, that server is put in health-check fail mode, and disabled. This dynamic check is performed every 30 seconds, which is the default.</p> <p><code>http://www2.example.com/</code> is checked by sending a simple <code>HEAD</code> request every 10 seconds and making sure that the response status is 2xx, 3xx or 4xx. <code>http://www3.example.com/</code> is checked every 5 seconds by simply ensuring that the socket to that server is up. If the backend is marked as "down" and it passes 2 health check, it will be re-enabled and added back into the load balancer. It takes 3 back-to-back health check failures to disable the server and move it out of rotation. Finally, <code>http://www4.example.com/</code> is not dynamically checked at all.</p> </div> <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="directive-section"><h2><a name="ProxyHCExpr" id="ProxyHCExpr">ProxyHCExpr</a> <a name="proxyhcexpr" id="proxyhcexpr">Directive</a></h2> <table class="directive"> <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Creates a named condition expression to use to determine health of the backend based on its response</td></tr> <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHCExpr <em>name</em> {<em>ap_expr expression</em>}</code></td></tr> <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr> <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_hcheck</td></tr> </table> <p>The <code class="directive">ProxyHCExpr</code> directive allows for creating a named condition expression that checks the response headers of the backend server to determine its health. This named condition can then be assigned to balancer members via the <code>hcexpr</code> parameter.</p> <div class="example"><h3>ProxyHCExpr: Allow for 2xx/3xx/4xx as passing</h3><pre class="prettyprint lang-config">ProxyHCExpr ok234 {%{REQUEST_STATUS} =~ /^[234]/} ProxyPass "/apps" "balancer://foo" <Proxy balancer://foo> BalancerMember http://www2.example.com/ hcmethod=HEAD hcexpr=ok234 hcinterval=10 </Proxy></pre> </div> <div class="note"> The <a href="../expr.html">expression</a> can use curly-parens ("{}") as quoting deliminators in addition to normal quotes. </div> <p>If using a health check method (eg: <code>GET</code>) which results in a response body, that body itself can be checked via <code>ap_expr</code> using the <code>hc()</code> expression function, which is unique to this module.</p> <p>In the following example, we send the backend a <code>GET</code> request and if the response body contains the phrase <em>Under maintenance</em>, we want to disable the backend.</p> <div class="example"><h3>ProxyHCExpr: Checking response body</h3><pre class="prettyprint lang-config">ProxyHCExpr in_maint {hc('body') !~ /Under maintenance/} ProxyPass "/apps" "balancer://foo" <Proxy balancer://foo> BalancerMember http://www.example.com/ hcexpr=in_maint hcmethod=get hcuri=/status.php </Proxy></pre> </div> <p><em>NOTE:</em> Since response body can quite large, it is best if used against specific status pages.</p> </div> <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="directive-section"><h2><a name="ProxyHCTemplate" id="ProxyHCTemplate">ProxyHCTemplate</a> <a name="proxyhctemplate" id="proxyhctemplate">Directive</a></h2> <table class="directive"> <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Creates a named template for setting various health check parameters</td></tr> <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHCTemplate <em>name</em> <em>parameter</em>=<em>setting</em> [...]</code></td></tr> <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr> <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_hcheck</td></tr> </table> <p>The <code class="directive">ProxyHCTemplate</code> directive allows for creating a named set (template) of health check parameters that can then be assigned to balancer members via the <code>hctemplate</code> parameter.</p> <div class="example"><h3>ProxyHCTemplate</h3><pre class="prettyprint lang-config">ProxyHCTemplate tcp5 hcmethod=tcp hcinterval=5 ProxyPass "/apps" "balancer://foo" <Proxy balancer://foo> BalancerMember http://www2.example.com/ hctemplate=tcp5 </Proxy></pre> </div> </div> <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="directive-section"><h2><a name="ProxyHCTPsize" id="ProxyHCTPsize">ProxyHCTPsize</a> <a name="proxyhctpsize" id="proxyhctpsize">Directive</a></h2> <table class="directive"> <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the total server-wide size of the threadpool used for the health check workers</td></tr> <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyHCTPsize <em>size</em></code></td></tr> <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyHCTPsize 16</code></td></tr> <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr> <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr> <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_hcheck</td></tr> </table> <p>If Apache httpd and APR are built with thread support, the health check module will offload the work of the actual checking to a threadpool associated with the Watchdog process, allowing for parallel checks. The <code class="directive">ProxyHCTPsize</code> directive determines the size of this threadpool. If set to <code>0</code>, no threadpool is used at all, resulting in serialized health checks.</p> <div class="example"><h3>ProxyHCTPsize</h3><pre class="prettyprint lang-config">ProxyHCTPsize 32</pre> </div> </div> </div> <div class="bottomlang"> <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_hcheck.html" title="English"> en </a> | <a href="../fr/mod/mod_proxy_hcheck.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p> </div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. 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