If in the HttpCorsRequestHandlercredentials was set to true and a origin header was present in the request. The vary header set in its child handler would be overwritten.
This change will keep the previous value from the child handler and add origin to it if it was not present already.
If in the
HttpCorsRequestHandlercredentialswas set totrueand aoriginheader was present in the request. Thevaryheader set in its child handler would be overwritten.This change will keep the previous value from the child handler and add
originto it if it was not present already.