url package

[B. T. Raven]

A web site claims that by merely loading this package you can C-x C-f on 
a Url and have its html code loaded into a buffer. I get a new buffer 
with the name of the html file that would be listed by clicking on View 
> Page Source in Firefox but the buffer is empty. What else has to be 
done besides M-x load-library url before opening a buffer with the url's 
source?

Thanks,

Ed