I’d recommend checking these options:
1. Content Type: Ensure the Content-Type header is set correctly. For JSON, it should be application/json.
2. Body Format: Make sure the body is properly formatted. For JSON, this would mean a valid JSON string.
3. Method Specification: Verify that the method is correctly set to ‘POST’ in the options.
4. Input Data: Check the data being sent in the body for any inconsistencies or formatting issues that could cause an error.