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The actual contents of the metadata are placed into the headers exactly as they re given in the file, with the addition of a terminating line feed, if necessary. This means that, for a client to actually understand the response, the file should contain legal HTTP header information. Placing anything else into the file will likely produce an invalid HTTP response; at best it ll cause other HTTP headers set by Apache to appear in the body of the response rather than the header. Creating a metadata file containing just a blank line would do just this. Metadata files are static files, so they don t allow for more dynamic responses. At the same time, they incur a performance penalty while Apache checks for and reads (if

found) a metadata file for every request that corresponds to a directory with MetaFiles enabled. As a result, mod_cern_meta is rarely used in modern servers. Its most common applications are instead handled by mod_negotiation, in case of language and content type handling, or mod_expires, in case of limiting document validity. It remains with the standard distribution primarily for compatibility with older sites that started out using file-based metadata. Negotiation is a more complex subject, which is covered in 5.

In this section, we are going to take you through the entire process of building a plug-in and configuring it within the Struts framework. The plug-in we are going to show you how to build will send out an e-mail newsletter of the top stories to all members in the JavaEdge application at a set interval.

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HTTP defines the Expires header to let servers tell proxies and browser caches how long a document can be considered current before a fresh copy is fetched from the server. The value of the Expires header is a date beyond which the document is considered out-of-date. You can tell Apache to send this header by including and enabling the mod_expires module.

mod_expires comes as standard with Apache, but isn t compiled in by default. Therefore, it must be compiled into Apache statically or enabled and loaded as a dynamic module with the LoadModule and AddModule directives (outlined in 3). Once enabled, Apache can be told to send Expires headers with this: ExpiresActive on ExpiresActive has universal scope, so it can be switched on and off for individual virtual hosts, directories, and files. However, Apache won t actually send an Expires header unless you also give it an expiry time with the ExpiresDefault or ExpiresByType directive.

Summary

You can set a default expiry time for all files on the server with the ExpiresDefault directive: ExpiresDefault A2419200 This tells Apache to send an Expires header so that documents expire 2,419,200 seconds (28 days) after the file was accessed by the client. This is useful for files that change rarely, such as archived documents. You can instead use the file s modification time by using M instead of A: ExpiresDefault M86400

Before we get to the details of the actual plug-in implementation, we want to discuss the exact behavior of the Newsletter Service and look at the classes that actually implement the service before demonstrating how to hook these classes into Struts with a custom plug-in implementation. The basic aim of the Newsletter Service is to send the list of top stories, via e-mail, to each member registered in the JavaEdge database. The logic for loading the top stories from the database is already built and is explained in 2. On top of this, we want to make the interval between sending the e-mails, the address of the SMTP server used, and the sender address of the e-mail externally configurable so they can be changed without having to go back to the code. Thankfully, the Struts plug-in model makes it quite easy for you to create the implementation that you want. As you will see, building the logic for the actual Newsletter Service is much more complex than building the plug-in.

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