Response for preflight has invalid HTTP status code 405

Question

I have read many similar problems in StackOverflow, but the solutions doesn\'t work for me.

I have WCF REST service:

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Answer 1

Looks like I have found solution. I just added second method:

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abstract PostTest: obj: Test -> unit

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abstract PostTestOptions: unit -> unit

It is just empty methods that do nothing. I don't know the reason, but all is working.