Javafx webview not redirecting on login in browser applet

I have an applet that is running a javafx application that needs oauth authentication for two social media sites. When running as a standalone application the redirect works fine and the tokens are passed back and forth and I get access. But when running from a browser i get a 404 page for one of the sites and a vague error message for the other. I self-sign my application and its libraries and put it in the exceptions list for testing before i buy a code signing certificate. What is changing between running it as an applet and running it as a standalone app.