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Reason: CORS preflight channel did not succeed
What went wrong?
The CORS 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 simply suffered any kind of networking error that might ordinarily occur.