Zend_Uri is a component that aids in manipulating and validating
Uniform Resource Identifiers (URIs).
Zend_Uri exists primarily to service other components, such as
Zend_Http_Client, but is also useful as a standalone utility.
URIs always begin with a scheme, followed by a colon. The
construction of the many different schemes varies significantly. The
Zend_Uri class provides a factory that returns a subclass
of itself which specializes in each scheme. The subclass will be named
Zend_Uri_<scheme>, where
<scheme> is the scheme, lowercased with the first letter
capitalized. An exception to this rule is HTTPS, which is also
handled by Zend_Uri_Http.