You can do this with cURL (man curl), and I suppose one of the Ruby cURL 
bindings.

- Sam

Bil Kleb wrote:
> CT wrote:
> 
>> I.e., following a link like 
>> http://validator.w3.org/check?uri=www.metafilter.com
>> leads to a page containing validation results for metafilter.com.
> 
> 
> Ah.  If I can figure out how to send a file to their
> file upload interface,
> 
>  http://validator.w3.org/file-upload.html
> 
> without manually using the form, I'd be in business.
>