Implement HTTP CORS preflight cache #9770
Description
Summary
Follow-up of #9537.
See https://fetch.spec.whatwg.org/#cors-preflight-cache
Cross-Origin resource sharing requests can use a cache of preflights (OPTIONS requests that fetch validation headers) to reduce the network traffic when communicating recurrently with the same validated origins.
Motivation
The current Origin Policy implementation lacks any caching mechanism impacting both the network traffic and client performance.
Basic Example
No response
Open Questions
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