fix: only inherit waitUntil
and platform context in fetch
#3224
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nuxt/nuxt#31375
Fixing a regression (revealed) from #3155
When calling a fetch with a relative base URL in a server context, nitro uses an internal fetch mechanism without an actual network round trip.
Event context has to be (partially) shared so that platform-specific contexts like
event.cf
andevent.waitUntil
are inherited and work. However, we should never share other context keys (including the cached value of the route rule that corresponds to the main event, not the sub-event).It was not revealed before because before #3155, the proxy route rule was kicking in before h3 route handler.
This PR fixes the root cause by only inheriting an internal namespace of the provider context +
waitUntil
(Note: this PR only targets v2 as direct fetch mechanism being updated with h3 v2 migration)