Apache Reference Manual (6)

KeepAliveTimeout directive
Syntax: KeepAliveTimeout seconds
Default: KeepAliveTimeout 15
Context: server config
Status: Core
Compatibility: KeepAliveTimeout is only available in Apache 1.1 and later.
The number of seconds Apache will wait for a subsequent request before closing the connection. Once a request has been received, the timeout value specified by the Timeout directive applies.
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directive
Syntax: ...
Context: any
Status: core
Access controls are normally effective for all access methods, and this is the usual desired behaviour. In the general case, access control directives should not be placed within a section.
The purpose of the directive is to restrict the effect of the access controls to the nominated HTTP methods. For all other methods, the access restrictions that are enclosed in the bracket will have no effect. The following example applies the access control only to the methods POST, PUT, and DELETE, leaving all other methods unprotected:

require valid-user

The method names listed can be one or more of: GET, POST, PUT, DELETE, CONNECT, OPTIONS, TRACE, PATCH, PROPFIND, PROPPATCH, MKCOL, COPY, MOVE, LOCK, and UNLOCK. The method name is case-sensitive. If GET is used it will also restrict HEAD requests.
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directive
Syntax: ...
Context: any
Status: core
Compatibility: Available in Apache 1.3.5 and later
and are used to enclose a group of access control directives which will then apply to any HTTP access method not listed in the arguments; i.e., it is the opposite of a section and can be used to control both standard and nonstandard/unrecognized methods. See the documentation for for more details.