Upload progress events add preflight request
smhigley opened this issue · comments
Sarah Higley commented
Enhancement
It would be nice to be able to prevent upload progress events with an option to avoid unwanted preflight requests.
From the W3 xhr spec (https://xhr.spec.whatwg.org/#request):
Registering one or more event listeners on an XMLHttpRequestUpload object will result in a CORS-preflight request