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Andrew ClarkandGitHub
3cd6d4dd1c
Adds a server-computed signal to static per-segment prefetch responses that tells the client whether a runtime prefetch request would return more content than the static response already contains. The signal is computed by tracking whether the prerender accessed any data source that hangs during a static prerender but would resolve during a runtime prerender. For example: cookies, headers, fallback params, and search params. The information is encoded two places: - As a prefetch hint called ShouldAttemptStaticPrefetch. This tells the client that it's worth attempting to do a static prefetch instead of a runtime one. It's only an optimization, though: if the static response ends up being insufficient, the client will follow it up with a runtime request. It's semantically OK if there are false positives. - Embedded in the static segment response. This tells the client whether the static response is missing data that would have been included in a runtime response. Unlike the prefetch hint, this value must never falsely claim that no runtime request is needed. A follow-up will update the client to skip the runtime request using this information. This commit only encodes the signal into the response.