url-retrieve bad handling of redirections

[Lennart Borgman]

I am using url-retrieve and url-retrieve-synchronously to fetch URLs. 
When the web pages fetched are redirected the callback routines are 
called with unexpected parameters. I am not quite sure of all the 
details but the most common error is that the callback parameter for the 
file name to save instead has the redirection url.

This is not documented. It is also quite bad since the file name for 
saving is no longer available.

There is also another bug. When trying to follow a link that is pointing 
to a directory but with the trailing slash omitted I get back just an 
empty buffer.

I have done a workaround for the first case - by following the 
redirection links. This workaround however prevents asynchronously 
download. Please see this link for test cases (and my work around):

   http://ourcomments.org/Emacs/DL/inst/url-dl.el


In GNU Emacs 22.0.50.1 (i386-mingw-nt5.0.2195)
Compiled from CVS 2005-06-20.