Reason

Reason: CORS preflight channel did not succeed

What went wrong?

The request requires preflight, preflighting could not be performed. There are a couple of reasons why preflighting might fail:

• A cross-site request has previously been performed that already did a preflight, and doing the preflight again is not permitted. Make sure your code only preflights once per connection.

• The preflight request suffered any kind of networking error that might ordinarily occur.

If the server is not under your control, see Client-side considerations for alternative approaches.

See also

• CORS errors

• Glossary:

• CORS introduction