ModX CMS Plugin / Hack :: SEO Strict URLs
Enforces the use of strict urls to prevent duplicate content.
In certain cases, search engine algorithms will devalue webpages for displaying identical content among multiple pages. With friendly URLs (FURLs) turned on and a FURL suffix defined, the same document can potentially be referenced using 8 separate URLs:
http://yoursite.com/doc_id
http://yoursite.com/doc_id/
http://yoursite.com/doc_id.suffix
http://yoursite.com/doc_id.suffix/
http://yoursite.com/alias
http://yoursite.com/alias/
http://yoursite.com/alias.suffix
http://yoursite.com/alias.suffix/
This plugin uses 301 redirects to forward users and search engines alike to a single URL based on plugin and FURL configuration. In addition to redirecting, the plugin can also (optionally) rewrite document links/URIs.
Xuru wrote the original beta version of this plugin and with the help of the ModX community it is now stable and part of the resource download on the ModX website. Future releases will include SEO Strict URLs as a core plugin. With this one plugin, ModX has addressed the one SEO issue that has plaugued the majority of open source CMS projects since they began.
You can dowload the full plugin here:
http://www.modxcms.com/SEO-Strict-URLs-1.0.1-1408.html
For post any support issues to the forums:
http://www.modxcms.com/forums/index.php?topic=12452


