Provides the {@link java.net.URLStreamHandler URLStreamHandler} for the
shttp scheme. This is not meant to be used directly, but instead is
intended for use by {@link java.net.URL java.net.URL}. When you set the
java system property java.protocol.handler.pkgs to
"HTTPClient", java.net.URL will look for and use this stream handler to
create and return a URLConnection instance whenever
openConnection is invoked on a URL with the "shttp" scheme.
Note: the HTTPClient does not currently support the shttp scheme, so
this handler will always throw an exception.