Reason: CORS request did not succeed
The HTTP request which makes use of CORS failed because the HTTP connection failed at either the network or protocol level. The error is not directly related to CORS, but is a fundamental network error of some kind.
In many cases, it is caused by a browser plugin (e.g. an ad blocker or privacy protector) blocking the request.
Other possible causes include:
httpsresource that has an invalid certificate will cause this error.
httpresource from a page with an
httpsorigin will also cause this error.
httpspages are not permitted to access
http://localhost, although this may be changed by Bug 1488740.
© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.