Set X-Content-Type-Options header

src/main/java/inf226/inchat/Handler.java

@@ -145,6 +145,8 @@ public class Handler extends AbstractHandler
         response.addCookie(new Cookie("session",session.identity.toString()));
         // Set X-Frame-Options header
         response.setHeader("X-Frame-Options", "SAMEORIGIN");
+        // Set X-Content-Type-Options header
+        response.setHeader("X-Content-Type-Options", "nosniff");
         
         final PrintWriter out = response.getWriter();
         // Handle a logged in request.