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9/21/2015 core ­ Apache HTTP Server Version 2.2 1/55 Apache HTTP Server Version 2.2 Apache Core Features Description: Core Apache HTTP Server features that are always available Status: Core Directives AcceptFilter AcceptPathInfo AccessFileName AddDefaultCharset AddOutputFilterByType AllowEncodedSlashes AllowOverride AuthName AuthType CGIMapExtension ContentDigest DefaultType <Directory> <DirectoryMatch> DocumentRoot EnableMMAP EnableSendfile ErrorDocument ErrorLog FileETag <Files> <FilesMatch> ForceType GprofDir HostnameLookups <IfDefine> <IfModule> Include KeepAlive KeepAliveTimeout <Limit> <LimitExcept> LimitInternalRecursion LimitRequestBody LimitRequestFields LimitRequestFieldSize LimitRequestLine LimitXMLRequestBody <Location> <LocationMatch> LogLevel MaxKeepAliveRequests MaxRanges MergeTrailers NameVirtualHost Options
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9/21/2015 core ­ Apache HTTP Server Version 2.2 2/55 Protocol Require RLimitCPU RLimitMEM RLimitNPROC Satisfy ScriptInterpreterSource ServerAdmin ServerAlias ServerName ServerPath ServerRoot ServerSignature ServerTokens SetHandler SetInputFilter SetOutputFilter Suexec TimeOut TraceEnable UseCanonicalName UseCanonicalPhysicalPort <VirtualHost> Comments AcceptFilter Directive Description: Configures optimizations for a Protocol's Listener Sockets Syntax: AcceptFilter protocol accept_filter Context: server config Status: Core Module: core Compatibility: Available in Apache 2.1.5 and later This directive enables operating system specific optimizations for a listening socket by the Protocol type. The basic premise is for the kernel to not send a socket to the server process until either data is received or an entire HTTP Request is buffered. Only FreeBSD's Accept Filters ( ? query=accept_filter&sektion=9) and Linux's more primitive TCP_DEFER_ACCEPT are currently supported. The default values on FreeBSD are: AcceptFilter http httpready AcceptFilter https dataready The httpready accept filter buffers entire HTTP requests at the kernel level. Once an entire request is received, the kernel then sends it to the server. See the accf_http(9) ( ? query=accf_http&sektion=9) man page for more details. Since HTTPS requests are encrypted, only the accf_data(9) ( ) filter is used. The default values on Linux are: AcceptFilter http data AcceptFilter https data
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9/21/2015 core ­ Apache HTTP Server Version 2.2 3/55 Linux's TCP_DEFER_ACCEPT does not support buffering http requests. Any value besides none will enable TCP_DEFER_ACCEPT on that listener. For more details see the Linux tcp(7) ( ) man page.
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