Most Cms and Frameworks use three lines in a .htaccess file to redirect all urls to a common file, usually index.php. The common file validates the url, extension, case sensitivity, etc and redirects to the specific request. Regardless of the possible url variations, a nearest match web-page is generated with a meta canonical reference to the preferred web-page url and possibly a 301 http response status code.
As an example, try the following link
- With no extension
- Another extension such as .html, .php, .tom, .dick or…
- Change case of “superman” to “SUPERMAN”, “SuperMan”, etc
- A numeric database table column id = 967
- A numeric reference, 967 preceded and/or followed by words separated with left slash separators.
- With or without www prefix
In each case, view the source code and notice the SEO friendly, canonical reference.
When back on the desktop the unique id will be supplied.
Edit
Added database table column id record = 967
Current site is a backup because of a recent MySQL hiccup. Hopefully, today will be up to date with the live search text box, etc