handling for the following HTTP response codes: 301, 302 or 401. For
301 and 302 response codes, the \code{location} header is used to
fetch the actual URL. For 401 response codes (authentication
-required), basic HTTP authentication is performed.
+required), basic HTTP authentication is performed. For 301 and 302 response
+codes, recursion is bounded by the value of the \var{maxtries} attribute,
+which defaults 10.
The parameters to the constructor are the same as those for
\class{URLopener}.