Preflight for Google Cloud Storage signed URL not returning CORS response headers
2 I'm trying to perform a signed resumable upload to GCS. Our frontend is running up against CORS restrictions on the initial request: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. The response headers show no CORS headers: alt-svc: quic=":443"; ma=2592000; v="44,43,39,35" cache-control: private, max-age=0 content-length: 0 content-type: text/html; charset=UTF-8 date: Tue, 13 Nov 2018 20:28:32 GMT expires: Tue, 13 Nov 2018 20:28:32 GMT server: UploadServer status: 200 x-guploader-uploadid: AEnB2Ups1tKbTbhPmsjrPXbIuIUyQt135AlSJ1n7-7XTwMrtQ2vUvn1WwpX3a_iusfmsXHaufdf5B3H2PzmDONs2wW7tKkLarYoxrVyWalhaX6FzGQPoRW0 Debugging, I sent a curl request mimicking our frontend's request: curl -H "Access-Control-Request-Headers: content-type,x-goog-resumable" -H "Access-Control-Request-Method: POST" -H "Origin: https://www.exa...