TightURL Library
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The TightURL package you downloaded (if you downloaded TightURL yourself)
contains a complete PHP/MySQL/Apache based URL-shortening redirection service.

You do not have to use the provided front-end application, tighturl.php and
its associated template files.  You do not need a front-end Web application at
all, though most users will not find TightURL useful without one, and most are
expected to use the provided tighturl.php front-end application.

Users who are only using the TightURL library, tighturl.lib.php, can remove
tighturl.php and all the templates, as well as all sections of the config
file, tighturl.config.inc.php that refer to front-end display variables used
by tighturl.php.

TightURL Library does not by itself provide the HTTP network APIs for REST,
SOAP, and XML.  These would normally be provided by a front-end Web
application such as tighturl.php (which will, or does provide these).

A minimalist application to provide the TightURL network API service is
provided as an example in local/tighturl.api.php