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indexterm:[Apache HTTP Server,files,.htaccess]indexterm:[.htaccess] The [option]`AllowOverride` directive allows you to specify which directives in a `.htaccess` file can override the default configuration. It takes the following form:
 
AllowOverride _type_pass:attributes[{blank}]…
 
The _type_ has to be one of the available grouping options as described in xref:Web_Servers.adoc#table-apache-httpdconf-allowoverride[Available AllowOverride options].
 
Available AllowOverride options
 
|Option|Description
|[option]`All`|All directives in `.htaccess` are allowed to override earlier configuration settings.
|[option]`None`|No directive in `.htaccess` is allowed to override earlier configuration settings.
|[option]`AuthConfig`|Allows the use of authorization directives such as [option]`AuthName`, [option]`AuthType`, or [option]`Require`.
|[option]`FileInfo`|Allows the use of file type, metadata, and `mod_rewrite` directives such as [option]`DefaultType`, [option]`RequestHeader`, or [option]`RewriteEngine`, as well as the [option]`Action` directive.
|[option]`Indexes`|Allows the use of directory indexing directives such as [option]`AddDescription`, [option]`AddIcon`, or [option]`FancyIndexing`.
|[option]`Limit`|Allows the use of host access directives, that is, [option]`Allow`, [option]`Deny`, and [option]`Order`.
|[option]`Options`pass:attributes[{blank}]=pass:attributes[{blank}]_option_,…|Allows the use of the [option]`Options` directive. Additionally, you can provide a comma-separated list of options to customize which options can be set using this directive.
 
Using the AllowOverride directive
 
AllowOverride FileInfo AuthConfig Limit
 
indexterm:[Apache HTTP Server,directives,BrowserMatch] [option]`BrowserMatch`
 
The [option]`BrowserMatch` directive allows you to modify the server behavior based on the client's web browser type. It takes the following form:
 
BrowserMatch _pattern_ _variable_pass:attributes[{blank}]…
 
The _pattern_ is a regular expression to match the User-Agent HTTP header field. The _variable_ is an environment variable that is set when the header field matches the pattern.
 
By default, this directive is used to deny connections to specific browsers with known issues, and to disable keepalives and HTTP header flushes for browsers that are known to have problems with these actions.
 
Using the BrowserMatch directive
 
BrowserMatch "Mozilla/2" nokeepalive
 
indexterm:[Apache HTTP Server,directives,CacheDefaultExpire] [option]`CacheDefaultExpire`
 
The [option]`CacheDefaultExpire` option allows you to set how long to cache a document that does not have any expiration date or the date of its last modification specified. It takes the following form:
 
CacheDefaultExpire _time_
 
The _time_ is specified in seconds. The default option is `3600` (that is, one hour).
 
Using the CacheDefaultExpire directive
 
CacheDefaultExpire 3600