In the Apigee docs (and via the new auto-cors stuff when creating an apiproxy) the recommendation is to put the AssignMessage for the CORS headers in the Target - Preflow - Response.In the case of a 4xx error coming from the backend, the Target Repso...

I am trying to access some flow variables that have a URL in the name and Apigee just won't resolve them. I'm guessing I need to escape some characters but I'm not 100% sure. I've tried escaping the colon and forward slashes but that doesn't seem to ...