If you have telnet or SSH access to your server you could make a symbolic link to your new page with the name of your old page and it would always serve up the current page no matter what URL the surfer went to.
create symlinks¸In a terminal window, type:
ln -s /path/to/real/file /path/to/alias
So in your case if terminal puts you in your home folder and your html file is in the web folder you would type this.
ln -s /web/index.html /web/matureindex.htm
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