As WordPress uses URL rewriting in Permalinks, you probably know that any change in a permalink will break your SEO (Search Engine Optimization) and all of the links will point to the incremented post. Sometimes, you have no other choice than to modify a permalink. Even worse, WordPress itself may have modified your permalink (for example, including the category name in your permalink structure, and add a post to another category after publishing it).
This recipe will show you how to fix this situation, using the Redirection plugin.
Before using it, you need to download, install, and activate the Redirection plugin from http://urbangiraffe.com/plugins/redirection/. See the standard plugin installation procedure at the beginning of this chapter.
Let's create a simple redirection as an example. Your post permalink was previously
http://myblog.com/categorie-one/mypost and it is now http://myblog.com/categorie-two/mypost.
We need...