Question

As part of Global.asax‘s BeginRequest event I conditionally add a CORS header based on a web.config value.

HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");

I lose this header when an HTTP 500 occurs. I’ve stepped through my code and the current response still maintains the headers throughout the Error event. Is there something else I can override that is flushing this headers?

Edit: The EndRequest event shows that the custom headers are missing and it looks like I can add them there instead. will update after

Answer 1

Not sure exactly what happens during the process but adding an event to EndRequest and checking for 500 allowed me to successfully add the headers back in.