I've developed a salesforce canvas application, and it uses signed requests and POSTs to request the page for the app. Now I've deployed the app and it's installed in a client's org. The issue is that the deployed pages are all requesting the canvas application's page using a GET request. I think it might have something to do with OAuth being used for authentication instead of signed requests in the client org, but I'm not sure. Any ideas as to what the issue is? I'd provide more info or code but I'm not really sure where to begin.