By Rich Bowen
Organizing web content is very dynamic and sometimes chaotic. therefore, it can be crucial that host internet servers manage URLs so that it will take care of quickly or completely relocated assets, hinder assaults through automatic worms, and keep an eye on source entry.
The Apache mod_rewrite module has lengthy encouraged matches of pleasure since it deals an remarkable toolset for manipulating URLs. The Definitive advisor to Apache mod_rewrite courses you thru configuration and use of the module for quite a few reasons, together with uncomplicated and conditional rewrites, entry keep an eye on, digital host upkeep, and proxies.
This e-book was once authored by way of wealthy Bowen, famous Apache specialist and Apache software program beginning member, and attracts on his years of expertise administering, and normal conversing and writing approximately, the Apache server.
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Extra info for The Definitive Guide to Apache mod_rewrite (Definitive Guides (Hardcover))
Instance. com$1. png during this instance, we’ve taken all of our GIF records, switched over them to PNG documents, and moved them to a different server. This RedirectMatch directive is ready to use backreferences three. midway will be a piece too a ways. five 5610_c01_final. qxd 6 1/10/06 1:17 AM web page 6 bankruptcy 1 ■ AN creation TO MOD_REWRITE to continue the complete asked URI course and use that route to request an analogous photograph over at the different server. utilizing RedirectMatch goes to be slower than utilizing Redirect. besides the fact that, it's marginally quicker than utilizing RewriteRule within the checks that I’ve played. digital Hosts As pointed out past, mod_rewrite can be utilized to provide dynamic digital hosts. yet simply because you are able to do this doesn’t suggest you'll want to. you might want to think about using usual digital hosts, in addition to in all likelihood utilizing mod_vhost_alias, earlier than utilizing mod_rewrite. mod_vhost_alias presents a hostname-to-directory mapping in order that digital hosts might be additional with no altering the configuration dossier. even though this strategy is much less versatile than utilizing mod_rewrite, it truly is attainable that it'll be adequate in your wishes. different Stuff after all, I can’t supply a formulation for whilst to take advantage of mod_rewrite and whilst to not. yet i will inform you what you must do whilst confronted with a state of affairs the place mod_rewrite seems to be an alternative: reflect on first even if you’re simply doing an easy Redirect or even a simple ProxyPass. removal mod_rewrite from a situation eliminates complexity and therefore makes issues run speedier. you want to examine mod_rewrite as a final answer, instead of because the first instrument you succeed in for on your toolbox. It’s additionally very important to appreciate that mod_rewrite used to be written in 1996, while Apache used to be nonetheless particularly restricted. Ralf Engelschall wrote the module to unravel difficulties that had no different resolution. the various mod_rewrite tutorials that you could be locate on-line come from that period and don’t think about the truth that lots of those difficulties now have more straightforward ideas with ordinary Apache configuration directives that didn’t exist in 1996. So, no matter if you come across an instance in a mod_rewrite educational or how-to someplace, this doesn’t inevitably suggest that it’s the way to deal with the matter. precis mod_rewrite is among the strongest and least understood modules to be had for Apache. knowing while to not use it truly is a minimum of as vital as realizing the right way to use it. all through this ebook, I’ll exhibit trade how you can remedy difficulties, whilst acceptable, utilizing equipment except mod_rewrite. within the subsequent bankruptcy, I’ll introduce ordinary expressions. If you’re already pleased with ordinary expressions, you could appropriately pass bankruptcy 2 and move immediately to bankruptcy three, which information mod_write set up and configuration. 5610_c02_final. qxd 1/10/06 1:16 AM bankruptcy web page 7 2 ■■■ standard Expressions m od_rewrite is outfitted on most sensible of the Perl appropriate standard Expression (PCRE) vocabulary, and a take hold of of normal expressions is key if you’re going to get something out of this publication. It’s no longer required that you simply be a customary expression (commonly known as regex) wizard, yet you do want to know the vocabulary.