How do you force a web browser to use POST when getting a url?
If you're trying to test something, I'd suggest using Fiddler to craft your http requests. It will allow you to specify the action verb (GET, POST, PUT, DELETE, etc) as well as request contents. If you're trying to test a very specific request from a link but with POST instead, then you can monitor the requests your browser is making and reissue it only with the modified POST action.