File Manager

003 File Manager

Current Path: /usr/local/share/doc/apache24/mod

usr / local / share / doc / apache24 / mod /

📁 ..
📄 core.html(535 B)
📄 core.html.de(238.47 KB)
📄 core.html.en(291.99 KB)
📄 core.html.es(262.51 KB)
📄 core.html.fr.utf8(322.9 KB)
📄 core.html.ja.utf8(254.26 KB)
📄 core.html.tr.utf8(312.17 KB)
📄 directive-dict.html(598 B)
📄 directive-dict.html.en(17.79 KB)
📄 directive-dict.html.es(19.47 KB)
📄 directive-dict.html.fr.utf8(19.11 KB)
📄 directive-dict.html.ja.utf8(20.06 KB)
📄 directive-dict.html.ko.euc-kr(15.65 KB)
📄 directive-dict.html.tr.utf8(19.11 KB)
📄 directives.html(760 B)
📄 directives.html.de(57.41 KB)
📄 directives.html.en(57.28 KB)
📄 directives.html.es(57.57 KB)
📄 directives.html.fr.utf8(57.39 KB)
📄 directives.html.ja.utf8(57.48 KB)
📄 directives.html.ko.euc-kr(57.13 KB)
📄 directives.html.tr.utf8(57.31 KB)
📄 directives.html.zh-cn.utf8(57.15 KB)
📄 event.html(201 B)
📄 event.html.en(28.84 KB)
📄 event.html.fr.utf8(31.36 KB)
📄 index.html(720 B)
📄 index.html.de(23.21 KB)
📄 index.html.en(22.93 KB)
📄 index.html.es(23.49 KB)
📄 index.html.fr.utf8(25.14 KB)
📄 index.html.ja.utf8(24.2 KB)
📄 index.html.ko.euc-kr(22.37 KB)
📄 index.html.tr.utf8(23.2 KB)
📄 index.html.zh-cn.utf8(22.81 KB)
📄 mod_access_compat.html(322 B)
📄 mod_access_compat.html.en(28.41 KB)
📄 mod_access_compat.html.fr.utf8(31.22 KB)
📄 mod_access_compat.html.ja.utf8(30.51 KB)
📄 mod_actions.html(489 B)
📄 mod_actions.html.de(13.78 KB)
📄 mod_actions.html.en(12.72 KB)
📄 mod_actions.html.fr.utf8(13.32 KB)
📄 mod_actions.html.ja.utf8(14.43 KB)
📄 mod_actions.html.ko.euc-kr(12.37 KB)
📄 mod_alias.html(479 B)
📄 mod_alias.html.en(36.82 KB)
📄 mod_alias.html.fr.utf8(40.04 KB)
📄 mod_alias.html.ja.utf8(28.55 KB)
📄 mod_alias.html.ko.euc-kr(22.95 KB)
📄 mod_alias.html.tr.utf8(39.33 KB)
📄 mod_allowmethods.html(223 B)
📄 mod_allowmethods.html.en(8.09 KB)
📄 mod_allowmethods.html.fr.utf8(8.4 KB)
📄 mod_asis.html(386 B)
📄 mod_asis.html.en(8.9 KB)
📄 mod_asis.html.fr.utf8(9.18 KB)
📄 mod_asis.html.ja.utf8(9.74 KB)
📄 mod_asis.html.ko.euc-kr(8.47 KB)
📄 mod_auth_basic.html(410 B)
📄 mod_auth_basic.html.en(19.57 KB)
📄 mod_auth_basic.html.fr.utf8(21.6 KB)
📄 mod_auth_basic.html.ja.utf8(16.32 KB)
📄 mod_auth_basic.html.ko.euc-kr(13.84 KB)
📄 mod_auth_digest.html(319 B)
📄 mod_auth_digest.html.en(20.11 KB)
📄 mod_auth_digest.html.fr.utf8(21.9 KB)
📄 mod_auth_digest.html.ko.euc-kr(20.41 KB)
📄 mod_auth_form.html(217 B)
📄 mod_auth_form.html.en(50.41 KB)
📄 mod_auth_form.html.fr.utf8(54.73 KB)
📄 mod_authn_anon.html(410 B)
📄 mod_authn_anon.html.en(16.5 KB)
📄 mod_authn_anon.html.fr.utf8(17.97 KB)
📄 mod_authn_anon.html.ja.utf8(18.47 KB)
📄 mod_authn_anon.html.ko.euc-kr(16.05 KB)
📄 mod_authn_core.html(219 B)
📄 mod_authn_core.html.en(16.05 KB)
📄 mod_authn_core.html.fr.utf8(17.01 KB)
📄 mod_authn_dbd.html(217 B)
📄 mod_authn_dbd.html.en(15.5 KB)
📄 mod_authn_dbd.html.fr.utf8(16.76 KB)
📄 mod_authn_dbm.html(406 B)
📄 mod_authn_dbm.html.en(12.69 KB)
📄 mod_authn_dbm.html.fr.utf8(13.59 KB)
📄 mod_authn_dbm.html.ja.utf8(13.07 KB)
📄 mod_authn_dbm.html.ko.euc-kr(11.09 KB)
📄 mod_authn_file.html(410 B)
📄 mod_authn_file.html.en(11.42 KB)
📄 mod_authn_file.html.fr.utf8(12.21 KB)
📄 mod_authn_file.html.ja.utf8(12.44 KB)
📄 mod_authn_file.html.ko.euc-kr(10.54 KB)
📄 mod_authn_socache.html(225 B)
📄 mod_authn_socache.html.en(18.82 KB)
📄 mod_authn_socache.html.fr.utf8(20.67 KB)
📄 mod_authnz_fcgi.html(221 B)
📄 mod_authnz_fcgi.html.en(26.98 KB)
📄 mod_authnz_fcgi.html.fr.utf8(29.33 KB)
📄 mod_authnz_ldap.html(221 B)
📄 mod_authnz_ldap.html.en(83.85 KB)
📄 mod_authnz_ldap.html.fr.utf8(86.4 KB)
📄 mod_authz_core.html(219 B)
📄 mod_authz_core.html.en(37.04 KB)
📄 mod_authz_core.html.fr.utf8(40.05 KB)
📄 mod_authz_dbd.html(217 B)
📄 mod_authz_dbd.html.en(18.19 KB)
📄 mod_authz_dbd.html.fr.utf8(19.97 KB)
📄 mod_authz_dbm.html(313 B)
📄 mod_authz_dbm.html.en(12.86 KB)
📄 mod_authz_dbm.html.fr.utf8(13.75 KB)
📄 mod_authz_dbm.html.ko.euc-kr(10.39 KB)
📄 mod_authz_groupfile.html(430 B)
📄 mod_authz_groupfile.html.en(10.4 KB)
📄 mod_authz_groupfile.html.fr.utf8(10.93 KB)
📄 mod_authz_groupfile.html.ja.utf8(9.9 KB)
📄 mod_authz_groupfile.html.ko.euc-kr(8.8 KB)
📄 mod_authz_host.html(219 B)
📄 mod_authz_host.html.en(13.27 KB)
📄 mod_authz_host.html.fr.utf8(14.19 KB)
📄 mod_authz_owner.html(414 B)
📄 mod_authz_owner.html.en(11.29 KB)
📄 mod_authz_owner.html.fr.utf8(11.92 KB)
📄 mod_authz_owner.html.ja.utf8(12.93 KB)
📄 mod_authz_owner.html.ko.euc-kr(11.1 KB)
📄 mod_authz_user.html(410 B)
📄 mod_authz_user.html.en(8.11 KB)
📄 mod_authz_user.html.fr.utf8(8.37 KB)
📄 mod_authz_user.html.ja.utf8(7.39 KB)
📄 mod_authz_user.html.ko.euc-kr(6.85 KB)
📄 mod_autoindex.html(499 B)
📄 mod_autoindex.html.en(60.78 KB)
📄 mod_autoindex.html.fr.utf8(67.28 KB)
📄 mod_autoindex.html.ja.utf8(64.92 KB)
📄 mod_autoindex.html.ko.euc-kr(50.19 KB)
📄 mod_autoindex.html.tr.utf8(66.14 KB)
📄 mod_brotli.html(211 B)
📄 mod_brotli.html.en(21.14 KB)
📄 mod_brotli.html.fr.utf8(22.5 KB)
📄 mod_buffer.html(211 B)
📄 mod_buffer.html.en(9.06 KB)
📄 mod_buffer.html.fr.utf8(9.57 KB)
📄 mod_cache.html(390 B)
📄 mod_cache.html.en(68.08 KB)
📄 mod_cache.html.fr.utf8(74.14 KB)
📄 mod_cache.html.ja.utf8(52.35 KB)
📄 mod_cache.html.ko.euc-kr(38.51 KB)
📄 mod_cache_disk.html(410 B)
📄 mod_cache_disk.html.en(20.1 KB)
📄 mod_cache_disk.html.fr.utf8(21.26 KB)
📄 mod_cache_disk.html.ja.utf8(18.36 KB)
📄 mod_cache_disk.html.ko.euc-kr(15.72 KB)
📄 mod_cache_socache.html(225 B)
📄 mod_cache_socache.html.en(18.28 KB)
📄 mod_cache_socache.html.fr.utf8(19.06 KB)
📄 mod_cern_meta.html(313 B)
📄 mod_cern_meta.html.en(11 KB)
📄 mod_cern_meta.html.fr.utf8(11.56 KB)
📄 mod_cern_meta.html.ko.euc-kr(10.54 KB)
📄 mod_cgi.html(382 B)
📄 mod_cgi.html.en(18.42 KB)
📄 mod_cgi.html.fr.utf8(20.06 KB)
📄 mod_cgi.html.ja.utf8(19.72 KB)
📄 mod_cgi.html.ko.euc-kr(16.31 KB)
📄 mod_cgid.html(386 B)
📄 mod_cgid.html.en(11.56 KB)
📄 mod_cgid.html.fr.utf8(12.15 KB)
📄 mod_cgid.html.ja.utf8(12.2 KB)
📄 mod_cgid.html.ko.euc-kr(10.7 KB)
📄 mod_charset_lite.html(322 B)
📄 mod_charset_lite.html.en(15.35 KB)
📄 mod_charset_lite.html.fr.utf8(16.54 KB)
📄 mod_charset_lite.html.ko.euc-kr(14.28 KB)
📄 mod_data.html(207 B)
📄 mod_data.html.en(7.49 KB)
📄 mod_data.html.fr.utf8(7.68 KB)
📄 mod_dav.html(382 B)
📄 mod_dav.html.en(17.91 KB)
📄 mod_dav.html.fr.utf8(19.45 KB)
📄 mod_dav.html.ja.utf8(20.66 KB)
📄 mod_dav.html.ko.euc-kr(17.71 KB)
📄 mod_dav_fs.html(394 B)
📄 mod_dav_fs.html.en(9.19 KB)
📄 mod_dav_fs.html.fr.utf8(9.74 KB)
📄 mod_dav_fs.html.ja.utf8(9.25 KB)
📄 mod_dav_fs.html.ko.euc-kr(8.93 KB)
📄 mod_dav_lock.html(307 B)
📄 mod_dav_lock.html.en(9.76 KB)
📄 mod_dav_lock.html.fr.utf8(10.32 KB)
📄 mod_dav_lock.html.ja.utf8(10.51 KB)
📄 mod_dbd.html(205 B)
📄 mod_dbd.html.en(24.71 KB)
📄 mod_dbd.html.fr.utf8(26.94 KB)
📄 mod_deflate.html(398 B)
📄 mod_deflate.html.en(28.35 KB)
📄 mod_deflate.html.fr.utf8(30.4 KB)
📄 mod_deflate.html.ja.utf8(31.06 KB)
📄 mod_deflate.html.ko.euc-kr(26.17 KB)
📄 mod_dialup.html(211 B)
📄 mod_dialup.html.en(7.49 KB)
📄 mod_dialup.html.fr.utf8(7.81 KB)
📄 mod_dir.html(469 B)
📄 mod_dir.html.en(22.39 KB)
📄 mod_dir.html.fr.utf8(24.43 KB)
📄 mod_dir.html.ja.utf8(19.66 KB)
📄 mod_dir.html.ko.euc-kr(16.53 KB)
📄 mod_dir.html.tr.utf8(23.66 KB)
📄 mod_dumpio.html(301 B)
📄 mod_dumpio.html.en(9.62 KB)
📄 mod_dumpio.html.fr.utf8(9.99 KB)
📄 mod_dumpio.html.ja.utf8(10.32 KB)
📄 mod_echo.html(386 B)
📄 mod_echo.html.en(7.44 KB)
📄 mod_echo.html.fr.utf8(7.58 KB)
📄 mod_echo.html.ja.utf8(7.88 KB)
📄 mod_echo.html.ko.euc-kr(7.55 KB)
📄 mod_env.html(469 B)
📄 mod_env.html.en(11.6 KB)
📄 mod_env.html.fr.utf8(12.08 KB)
📄 mod_env.html.ja.utf8(11.07 KB)
📄 mod_env.html.ko.euc-kr(9.9 KB)
📄 mod_env.html.tr.utf8(11.72 KB)
📄 mod_example_hooks.html(325 B)
📄 mod_example_hooks.html.en(11.2 KB)
📄 mod_example_hooks.html.fr.utf8(11.9 KB)
📄 mod_example_hooks.html.ko.euc-kr(10.76 KB)
📄 mod_expires.html(398 B)
📄 mod_expires.html.en(16.71 KB)
📄 mod_expires.html.fr.utf8(17.81 KB)
📄 mod_expires.html.ja.utf8(18.29 KB)
📄 mod_expires.html.ko.euc-kr(15.08 KB)
📄 mod_ext_filter.html(410 B)
📄 mod_ext_filter.html.en(18.22 KB)
📄 mod_ext_filter.html.fr.utf8(19.71 KB)
📄 mod_ext_filter.html.ja.utf8(22.86 KB)
📄 mod_ext_filter.html.ko.euc-kr(18.94 KB)
📄 mod_file_cache.html(316 B)
📄 mod_file_cache.html.en(15.4 KB)
📄 mod_file_cache.html.fr.utf8(17.64 KB)
📄 mod_file_cache.html.ko.euc-kr(14.45 KB)
📄 mod_filter.html(211 B)
📄 mod_filter.html.en(31.22 KB)
📄 mod_filter.html.fr.utf8(34.81 KB)
📄 mod_headers.html(398 B)
📄 mod_headers.html.en(33.85 KB)
📄 mod_headers.html.fr.utf8(37.21 KB)
📄 mod_headers.html.ja.utf8(25.01 KB)
📄 mod_headers.html.ko.euc-kr(19.54 KB)
📄 mod_heartbeat.html(217 B)
📄 mod_heartbeat.html.en(9.55 KB)
📄 mod_heartbeat.html.fr.utf8(9.8 KB)
📄 mod_heartmonitor.html(223 B)
📄 mod_heartmonitor.html.en(11.63 KB)
📄 mod_heartmonitor.html.fr.utf8(11.97 KB)
📄 mod_http2.html(209 B)
📄 mod_http2.html.en(62.72 KB)
📄 mod_http2.html.fr.utf8(66.54 KB)
📄 mod_ident.html(390 B)
📄 mod_ident.html.en(9.94 KB)
📄 mod_ident.html.fr.utf8(10.45 KB)
📄 mod_ident.html.ja.utf8(10.88 KB)
📄 mod_ident.html.ko.euc-kr(9.47 KB)
📄 mod_imagemap.html(310 B)
📄 mod_imagemap.html.en(21.22 KB)
📄 mod_imagemap.html.fr.utf8(23.4 KB)
📄 mod_imagemap.html.ko.euc-kr(19.77 KB)
📄 mod_include.html(304 B)
📄 mod_include.html.en(59.85 KB)
📄 mod_include.html.fr.utf8(65.42 KB)
📄 mod_include.html.ja.utf8(55.34 KB)
📄 mod_info.html(386 B)
📄 mod_info.html.en(14.6 KB)
📄 mod_info.html.fr.utf8(15.53 KB)
📄 mod_info.html.ja.utf8(15.12 KB)
📄 mod_info.html.ko.euc-kr(12.6 KB)
📄 mod_isapi.html(301 B)
📄 mod_isapi.html.en(23.44 KB)
📄 mod_isapi.html.fr.utf8(25.48 KB)
📄 mod_isapi.html.ko.euc-kr(21.62 KB)
📄 mod_lbmethod_bybusyness.html(237 B)
📄 mod_lbmethod_bybusyness.html.en(7.85 KB)
📄 mod_lbmethod_bybusyness.html.fr.utf8(8.25 KB)
📄 mod_lbmethod_byrequests.html(237 B)
📄 mod_lbmethod_byrequests.html.en(12.55 KB)
📄 mod_lbmethod_byrequests.html.fr.utf8(13.08 KB)
📄 mod_lbmethod_bytraffic.html(235 B)
📄 mod_lbmethod_bytraffic.html.en(8.2 KB)
📄 mod_lbmethod_bytraffic.html.fr.utf8(8.6 KB)
📄 mod_lbmethod_heartbeat.html(235 B)
📄 mod_lbmethod_heartbeat.html.en(8.29 KB)
📄 mod_lbmethod_heartbeat.html.fr.utf8(8.65 KB)
📄 mod_ldap.html(207 B)
📄 mod_ldap.html.en(52.54 KB)
📄 mod_ldap.html.fr.utf8(57.83 KB)
📄 mod_log_config.html(504 B)
📄 mod_log_config.html.en(35.54 KB)
📄 mod_log_config.html.fr.utf8(38.02 KB)
📄 mod_log_config.html.ja.utf8(33.81 KB)
📄 mod_log_config.html.ko.euc-kr(25.54 KB)
📄 mod_log_config.html.tr.utf8(37.4 KB)
📄 mod_log_debug.html(217 B)
📄 mod_log_debug.html.en(10.17 KB)
📄 mod_log_debug.html.fr.utf8(10.76 KB)
📄 mod_log_forensic.html(415 B)
📄 mod_log_forensic.html.en(12.76 KB)
📄 mod_log_forensic.html.fr.utf8(14.38 KB)
📄 mod_log_forensic.html.ja.utf8(14.2 KB)
📄 mod_log_forensic.html.tr.utf8(13.26 KB)
📄 mod_logio.html(479 B)
📄 mod_logio.html.en(10.38 KB)
📄 mod_logio.html.fr.utf8(11.02 KB)
📄 mod_logio.html.ja.utf8(10.25 KB)
📄 mod_logio.html.ko.euc-kr(9.23 KB)
📄 mod_logio.html.tr.utf8(10.61 KB)
📄 mod_lua.html(205 B)
📄 mod_lua.html.en(91.35 KB)
📄 mod_lua.html.fr.utf8(101.11 KB)
📄 mod_macro.html(209 B)
📄 mod_macro.html.en(15.14 KB)
📄 mod_macro.html.fr.utf8(16.11 KB)
📄 mod_md.html(203 B)
📄 mod_md.html.en(87.73 KB)
📄 mod_md.html.fr.utf8(94.79 KB)
📄 mod_mime.html(295 B)
📄 mod_mime.html.en(64.63 KB)
📄 mod_mime.html.fr.utf8(70.52 KB)
📄 mod_mime.html.ja.utf8(70.58 KB)
📄 mod_mime_magic.html(219 B)
📄 mod_mime_magic.html.en(16.67 KB)
📄 mod_mime_magic.html.fr.utf8(17.74 KB)
📄 mod_negotiation.html(316 B)
📄 mod_negotiation.html.en(21.36 KB)
📄 mod_negotiation.html.fr.utf8(23.09 KB)
📄 mod_negotiation.html.ja.utf8(22.53 KB)
📄 mod_nw_ssl.html(211 B)
📄 mod_nw_ssl.html.en(9.5 KB)
📄 mod_nw_ssl.html.fr.utf8(9.8 KB)
📄 mod_privileges.html(219 B)
📄 mod_privileges.html.en(29.36 KB)
📄 mod_privileges.html.fr.utf8(32.73 KB)
📄 mod_proxy.html(298 B)
📄 mod_proxy.html.en(128.29 KB)
📄 mod_proxy.html.fr.utf8(142.53 KB)
📄 mod_proxy.html.ja.utf8(92.16 KB)
📄 mod_proxy_ajp.html(310 B)
📄 mod_proxy_ajp.html.en(32.1 KB)
📄 mod_proxy_ajp.html.fr.utf8(35.22 KB)
📄 mod_proxy_ajp.html.ja.utf8(32.25 KB)
📄 mod_proxy_balancer.html(325 B)
📄 mod_proxy_balancer.html.en(22.97 KB)
📄 mod_proxy_balancer.html.fr.utf8(25.71 KB)
📄 mod_proxy_balancer.html.ja.utf8(18.82 KB)
📄 mod_proxy_connect.html(322 B)
📄 mod_proxy_connect.html.en(10.05 KB)
📄 mod_proxy_connect.html.fr.utf8(10.56 KB)
📄 mod_proxy_connect.html.ja.utf8(9.2 KB)
📄 mod_proxy_express.html(225 B)
📄 mod_proxy_express.html.en(13.41 KB)
📄 mod_proxy_express.html.fr.utf8(14.08 KB)
📄 mod_proxy_fcgi.html(219 B)
📄 mod_proxy_fcgi.html.en(22.3 KB)
📄 mod_proxy_fcgi.html.fr.utf8(24.51 KB)
📄 mod_proxy_fdpass.html(223 B)
📄 mod_proxy_fdpass.html.en(7.49 KB)
📄 mod_proxy_fdpass.html.fr.utf8(7.72 KB)
📄 mod_proxy_ftp.html(217 B)
📄 mod_proxy_ftp.html.en(18.35 KB)
📄 mod_proxy_ftp.html.fr.utf8(20.33 KB)
📄 mod_proxy_hcheck.html(223 B)
📄 mod_proxy_hcheck.html.en(16.93 KB)
📄 mod_proxy_hcheck.html.fr.utf8(18.04 KB)
📄 mod_proxy_html.html(219 B)
📄 mod_proxy_html.html.en(33.61 KB)
📄 mod_proxy_html.html.fr.utf8(38.34 KB)
📄 mod_proxy_http.html(219 B)
📄 mod_proxy_http.html.en(11.82 KB)
📄 mod_proxy_http.html.fr.utf8(12.7 KB)
📄 mod_proxy_http2.html(221 B)
📄 mod_proxy_http2.html.en(10.25 KB)
📄 mod_proxy_http2.html.fr.utf8(10.81 KB)
📄 mod_proxy_scgi.html(219 B)
📄 mod_proxy_scgi.html.en(14.63 KB)
📄 mod_proxy_scgi.html.fr.utf8(15.59 KB)
📄 mod_proxy_uwsgi.html(221 B)
📄 mod_proxy_uwsgi.html.en(8.4 KB)
📄 mod_proxy_uwsgi.html.fr.utf8(8.7 KB)
📄 mod_proxy_wstunnel.html(227 B)
📄 mod_proxy_wstunnel.html.en(10.4 KB)
📄 mod_proxy_wstunnel.html.fr.utf8(10.87 KB)
📄 mod_ratelimit.html(217 B)
📄 mod_ratelimit.html.en(7.05 KB)
📄 mod_ratelimit.html.fr.utf8(7.38 KB)
📄 mod_reflector.html(217 B)
📄 mod_reflector.html.en(8.53 KB)
📄 mod_reflector.html.fr.utf8(8.87 KB)
📄 mod_remoteip.html(215 B)
📄 mod_remoteip.html.en(26.61 KB)
📄 mod_remoteip.html.fr.utf8(29.21 KB)
📄 mod_reqtimeout.html(219 B)
📄 mod_reqtimeout.html.en(12.75 KB)
📄 mod_reqtimeout.html.fr.utf8(13.64 KB)
📄 mod_request.html(304 B)
📄 mod_request.html.en(9.31 KB)
📄 mod_request.html.fr.utf8(9.91 KB)
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Editing: mod_proxy_hcheck.html.en

<?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" />

<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>

<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 an <code>HTTP OPTIONS</code> request to the backend</td><td>*</td></tr>
        		<tr><td>HEAD</td><td>Send an <code>HTTP HEAD</code> request to the backend</td><td>*</td></tr>
        		<tr><td>GET</td><td>Send an <code>HTTP GET</code> request to the backend</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>&nbsp;</td>
        <td>Additional URI to be appended to the worker URL for the health check.</td></tr>
    <tr><td>hctemplate</td>
        <td>&nbsp;</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>&nbsp;</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>
<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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_proxy_hcheck">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;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/}

&lt;Proxy balancer://foo&gt;
  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/
&lt;/Proxy&gt;

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"

&lt;Proxy balancer://foo&gt;
  BalancerMember http://www2.example.com/  hcmethod=HEAD hcexpr=ok234 hcinterval=10
&lt;/Proxy&gt;</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"

&lt;Proxy balancer://foo&gt;
  BalancerMember http://www.example.com/ hcexpr=in_maint hcmethod=get hcuri=/status.php
&lt;/Proxy&gt;</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"

&lt;Proxy balancer://foo&gt;
  BalancerMember http://www2.example.com/ hctemplate=tcp5
&lt;/Proxy&gt;</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">&nbsp;en&nbsp;</a> |
<a href="../fr/mod/mod_proxy_hcheck.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</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&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed 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 Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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