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What It Means Time when client accessed the file Current time This is the same as the access time Time when the file was last changed
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For example, the following directives tell Apache to send headers to tell the browser that HTML documents should be expired after seven days from the day of access and that the GIF images should be expired after any changes in file or three hours and ten minutes later
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5 The Apache Modules
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ExpiresByType text/html access plus 7 days ExpiresByType image/gif modification plus 3 hours 10 minutes
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ExpiresDefault
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The ExpiresDefault directive sets the default expiration time for all documents in the context in which it is specified For example, if this directive is specified in the virtual host context, it will only apply to the documents accessible via the virtual host Similarly, you can specify this directive in a per-directory context, which allows all documents in that directory to expire at a specified interval See ExpiresByType for details on the syntax Syntax 1: ExpiresDefault Mseconds | Aseconds Syntax 2: ExpiresDefault base_time [plus] num
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Years|Months|Weeks|Days|Hours|Minutes|Seconds
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Context: Server config, virtual host, directory, per-directory access control file (htaccess) Override: Indexes Following are two examples:
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ExpiresDefault M3600 ExpiresDefault access plus 2 days
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The first example sets the expiration time to one hour after the last modification time of the documents The second one sets the expiration time to two days after access by the client
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mod_cern_meta
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The mod_cern_meta module is not compiled by default It provides support for metainformation This information can either be additional HTTP headers such as:
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Expires: Saturday, 19-May-01 12:00:00 GMT
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or it can be any other information such as the following, where the meta information is stored in a file and appears along with the HTTP response header:
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Foo=Bar
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MetaFiles
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The MetaFiles directive enables or disables metaheader file processing Syntax: MetaFiles On | Off Default setting: MetaFiles Off Context: Per-directory access control file (htaccess)
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The MetaDir directive specifies the name of the directory that stores metaheader files For example, if you have a directory called /www/mycompany/public/htdocs and want to store metainformation files for that directory, you need to create a subdirectory called web if you use the default value for the MetaDir directive The web directory stores metaheader files Syntax: MetaDir directory Default setting: MetaDir web Context: Per-directory access control file (htaccess)
MetaSuffix
The MetaSuffix directive specifies the filename extension for metainformation files For example, if you have an HTML file called mypagehtml, then you need to create mypagehtmlmeta (using the default value of this directive) to store your metaheaders The mypagehtmlmeta file must reside in the directory specified by the MetaDir directive Syntax: MetaSuffix suffix Default setting: MetaSuffix meta Context: Per-directory access control file (htaccess) To enable Apache to send out metainformation for a directory called /www/
mycompany/public/htdocs, you need to do the following:
1 Set the MetaFiles directive to on in the per-directory configuration file (htaccess) for /www/mycompany/public/htdocs You can also set the MetaDir and MetaSuffix directive in this file 2 Create a subdirectory called web (assuming you are using the default for MetaDir directive) 3 Create a text file with extension meta (assuming you are using the default value for MetaSuffix directive) 4 Put all the HTTP headers that you want to supply in this file For example, to provide metaheaders for a file named /www/mycompany/public/ htdocs/mypagehtml, you need to create a file called /www/mycompany/public/ htdocs/web/mypagehtmlmeta This file could include lines such as:
Expires: Saturday, 19-May-01 12:00:00 GMT Anything=Whatever
5 The Apache Modules
Server Information and Logging Modules
The modules in this section, as shown in Table 5-9, enable you to log access, report server status and configuration information, and also to track users who are using cookies
Table 5-9 Server Information and Logging Modules
Module mod_log_config mod_status mod_info mod_usertrack Purpose Provides customizable access logging See 8 for details Displays status information See 8 for details Displays server configuration information See 8 for details Provides user tracking by using HTTP Cookies See 8 for details