Automated HTTP requests sent from browser or Trello server?

[Brendan Mitchell]

When I create a Trello button that sends an http request, is that request sent from my browser or the Trello servers? 
In other words, can I create a Trello button that talks to a web service that is accessible only on my LAN?

[milynnus · Accepted solution]

@Brendan Mitchell 

Http request calls a URL and it is from the server. The return response is {httpresponse}