If I change a folder name in server ant thus the URL will be changed, could I perform 301 redirection or this is only for the case that the web page has been transferred to another folder?
Entire folders can be redirected, just like files can. You can add a line like this to
Which will cause every file in the directory to be 301 redirected:
This is documented in Apache's mod_alias redirect documentation
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If the URL has changed, you'll need a redirect. If a certain page was in site.com/folder1 before and is now in site.com.folder2, you'll need to redirect it. A 301 redirect is for the case that a page has been transferred to another folder, but for all practical purposes, changing the folders name is the same as putting the files in a different folder.