This will result in fewer requests, but the author didn't provide any test results demonstrating that the server load was appreciably reduced. Since the preflig

This will result in fewer requests, but the author didn't provide any test results demonstrating that the server load was appreciably reduced. Since the preflight OPTIONS request will be cached, it will only occur for some fraction of the total volume of requests. Since those requests are also very low impact, I'm skeptical that this pattern will have a consequential impact for most APIs.