[Rails] Hide URL from view

Hi,
I have a button as below.
<%= button_to('On', @userdetail.url + '?value=1', :method => "post", :remote => true, :disable_with => 'loading...') %>   
Here @userdetail.url is a external URL, and I don't want to show the url in view source for users.

How can I create a controller action to do the task and point the button to that controller action? Tried implementing curl in my controller action but couldn't make it work as this button action is a post method.

Any example help will help.
I am also trying to expose the button action as a API. Is there anyway I can expose the same controller action as a API?

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