Route Server Actions directly to their owning routes - #96950
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Summary
Today, the client sends a Server Action request to the route it is currently rendering. If that route's worker does not contain the action, the server consults the action manifest and forwards the request to another worker that does.
This server-side forwarding introduces an extra internal request and requires the receiving worker to handle request state that belongs to the original route. It has caused correctness issues and miscellaneous bugs.
This change starts replacing that architecture by including opaque routing keys for the actions handled by each route in its Flight payload. Each Flight response scopes its
callServercallback to the URL and routing keys associated with that response. When an action is invoked, the client hashes its ID and dispatches it to that URL if the response's worker advertised the corresponding key. Otherwise, it checks whether another previously discovered route advertised the action.When the destination differs from the currently rendered route, the client omits its router state tree. The server uses that absence to execute the action without attempting to render the destination page, while still returning the action result, redirect, and revalidation metadata.
The existing server-side forwarding mechanism remains in place temporarily and will be removed in a follow-up.
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