server.py.patch

# Patch required for server.py in the griffin project on the Ultimaker printers to allow CORS requests

--- server.py.bak	2019-06-09 03:52:22.422238475 +0000
+++ server.py	2019-06-09 04:04:55.170299084 +0000
@@ -39,6 +39,11 @@
         # Disable the default werkzeug logger, this logs all http requests, which spams the logs
         logging.getLogger('werkzeug').disabled = True
 
+
+        # Add CORS support
+        self.after_request(Server.allow_cors)
+
+
     def addExposedObject(self, exposed_object):
         self._exposed_objects.append(exposed_object)
 
@@ -84,3 +89,11 @@
         else:
             response.status_code = 500
         return response
+
+    @staticmethod
+    def allow_cors(response):
+        if "Origin" in flask.request.headers: 
+            response.headers["Access-Control-Allow-Origin"] = flask.request.headers["Origin"]
+            response.headers["Vary"] = "Origin"
+        return response
+