iPlanet 6.0

AOLServer | Apache | Microsoft IIS | Netscape iPlanet 6.0 | Netscape iPlanet 4.x | Netscape Enterprise Server 3.6

Custom Headers

Beginning with iPlanet Web Server 6.0 SP2, webmasters have the ability to easily add custom headers to the default set of HTTP headers. This can be accomplished by editing the obj.conf file within the site’s configuration directory. The following line must be added to obj.conf:

AuthTrans fn="set-variable" insert-srvhdrs="HEADERNAME=VALUE"

For instance, if a webmaster wishes to add a custom header named Author that has a value of "Internet Services", the following line would be added to obj.conf:

AuthTrans fn="set-variable" insert-srvhdrs="Author=\"Internet Services\""

File Caching

The iPlanet Web Server also features file caching, which allows static information to be served faster. In the previous version of the server, there was an accelerator cache that routed requests to the file cache, but the accelerator cache is no longer used. The file cache contains information about static files and the contents. The file cache also caches information that is used to speed up processing of server-parsed HTML.

File caching is enabled by default. The file cache settings are contained within nsfc.conf. Administrators should use the Server Manager to change settings. To configure the file cache, follow these steps:

1. From the Server Manager, select the Preferences tab.
2. Select File Cache Configuration.
3. Check Enable File Cache, if not already selected.
4. Choose whether or not to transmit files. When you enable Transmit File, the server caches open file descriptors for files in the file cache, rather than the file contents, and PR_TransmitFile is used to send the file contents to a client. When Transmit File is enabled, the distinction normally made by the file cache between small, medium, and large files no longer applies, since only the open file descriptor is being cached. By default, Transmit File is enabled on Windows NT, and not enabled on Unix. On Unix, only enable Transmit File for platforms that have native OS support for PR_TransmitFile, which currently includes HP-UX and AIX. It is not recommended for other Unix/Linux platforms.
5. Enter a size for the hash table. The default size is twice the maximum number of files plus 1. For example, if your maximum number of files is set to 1024, the default hash table size is 2049.
6. Enter a maximum age in seconds for a valid cache entry. By default, this is set to 30. This setting controls how long cached information will continue to be used once a file has been cached. An entry older than MaxAge is replaced by a new entry for the same file, if the same file is referenced through the cache. Set the maximum age based on whether the content is updated (existing files are modified) on a regular schedule or not. For example, if content is updated four times a day at regular intervals, you could set the maximum age to 21600 seconds (6 hours). Otherwise, consider setting the maximum age to the longest time you are willing to serve the previous version of a content file after the file has been modified.
7. Enter the Maximum Number of Files to be cached. By default, this is set to 1024.
8. (Unix /Linux only) Enter medium and small file size limits in bytes. By default, the Medium File Size Limit is set to 525000 (525 KB). By default, Small File Size Limit is set to 2048. The cache treats small, medium, and large files differently. The contents of medium files are cached by mapping the file into virtual memory (currently only on Unix/Linux platforms). The contents of "small" files are cached by allocating heap space and reading the file into it. The contents of "large" files (larger than "medium") are not cached, although information about large files is cached. The advantage of distinguishing between small files and medium files is to avoid wasting part of many pages of virtual memory when there are lots of small files. So the Small File Size Limit is typically a slightly lower value than the VM page size.
9. (Unix /Linux only) Set the medium and small file space. The medium file space is the size in bytes of the virtual memory used to map all medium sized files. By default, this is set to 10000000 (10MB). The small file space is the size of heap space in bytes used for the cache, including heap space used to cache small files. By default, this is set to 1MB for Unix/Linux.
10. Click OK.
11. Click Apply.
12. Select Apply Changes to restart your server.

For more information, go to http://docs.sun.com/db/doc/816-5682-10

	Help | Terms of Service | Privacy Policy | Download AOL 9.0 Last Updated: Thursday January 30, 2003 © 2004 America Online, Inc.