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http://issues.apache.org/bugzilla/show_bug.cgi?id=38355 ------- Additional Comments From [EMAIL PROTECTED] 2006-01-23 13:32 ------- (In reply to comment #0) > This feature enhancement for mod_rewrite adds support for an external > rewrite-program which links dynamically to mod_rewrite instead of > communicating > through a pipe, such as RewriteMap prg:/path/to/map_program > This feature can be useful in conditions, where external rewrite programs may > hang. And if they hang, all of the httpd-processes which have to consult the > external mapping programm will hang too, causing a denial of service. Using > dso-support for RewriteMap allows to write more complicated and time consuming > mapping-applications, for instance to connect to database-servers and/or to > search objects on Squid-Caches using ICP. (In reply to comment #1) > I don't understand. Since httpd 2.0 it is possible to write regular modules > (dso > or static) which extend mod_rewrite. How is that different? (In reply to comment #2) Using RewriteMap dso:/path/to/module.so is much easier, than writing a full Apache module. Have a look at the example on the associated webpage. Writing such modules is just as easy as writing an external program, however without the restriction such external programs have. The Squid-Cache for instance allows to spawn more than one external rewrite-program, and pipes the request to the next idle program. Apache on the other side allows only one such program, which when busy, blocks all the other Apache-slots requireing a dynamic rewriting. Remember what is written about the external rewrite program in the 'URL Rewriting Guide' --- be very careful: 1. ``Keep it simple, stupid'' (KISS), because if this program hangs it will hang the Apache server when the rule occurs. 2. Avoid one common mistake: never do buffered I/O on stdout! This will cause a deadloop! Hence the ``$|=1'' in the above example... 3. Use the RewriteLock directive to define a lockfile mod_rewrite can use to synchronize the communication to the program. By default no such synchronization takes place. --- with this modrewrite-dso-patch you can bypass item 1, 2 and 3. -- Configure bugmail: http://issues.apache.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
