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A HTTP request can render the same React tree in multiple passes with different semantics for `connection()`: the prospective and final prerenders of a runtime prefetch, or a navigation's dynamic render and the runtime prerender that is spawned from it to refresh the client's prefetch cache. All of these passes previously resolved `headers()` to the single sealed headers object created lazily by the request store, so userland caches keyed on the identity of `await headers()` (any per-request memoization that treats the headers object as "the request") leaked promises across passes. With this change, every render pass resolves `headers()` to a distinct object over the same underlying data, making "the headers object identifies the request within one render pass" a real contract. --------- Co-authored-by: Claude Fable 5 <[email protected]>