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    Thank you for this! The fact that OPTIONS requests will be cached with this header is pretty opaque in all the CORS documentation that I've read. Commented Jun 30, 2017 at 21:25
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    And the cache only takes effect with the exact same url. I want a domain-level preflight cache which can really reduce the round trips. (CORS is silly!) Commented May 4, 2018 at 3:38