Posting photos to Twitter

Hello again,

I'm trying to post a remote photo (I have a url, not a file) to twitter
using the new api call

statuses/update_with_media

I found one page of doc at

https://dev.twitter.com/docs/api/1/post/statuses/update_with_media

but could really use an example call from someone that has already done
this.

Thanks in advance,
Dan