I'm curious as to what happens if you have already set up custom permalinks ('pretty permalinks') and later decide that you want to change the structure -- how does WordPress then handle requests for posts using the former URL structure? Does it set up 301 redirects to the new location? Is it able to forward users to the new permalink or do they get a 404 error?
I originally set up my custom permalinks to be of the form /%postname%-%postid%.htm but it turns out that that's resulting in REALLY long URLs (which means when someone goes to email the URL from one of my posts, it's often broken by the email program b/c it takes up more than one line).
As such, I now would like to change the custom permalink structure again, but am afraid of what will happen to all of the inbound links to the existing posts with the original custom permalink structure.
Can someone please let me know what to expect when changing a blog with 100+ posts from one custom permalink structure to another?
Is setting up the custom permalink structure something that can only be done when you first setup your WordPress blog or does WordPress gracefully remember your old structure and redirect visitors to the new URLs? Or do you have to manually set up 301 redirects in the .htaccess for each individual URL if you want to change your permalink structure a second time?
Very much looking forward to any help that anyone can provide on this issue. As it is, I'm already dealing with problems with URL changes since I finally moved How to Blog from a subdomain on typepad to my own domain powered by WordPress (which I'm so excited about (I love WordPress!!) but am a little freaked about the loss in all my google traffic...and Six Apart refuses to let me set up 301 redirects from the old typepad blog - jerks)
TIA for the help!!