fix(chore): Send upstream 50x error instead of failing #441
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Related to cache-test.fyi:
heuristic-502-not_cached
,heuristic-503-not_cached
,heuristic-504-not_cached
.At the end of ServeHTTP, if Upstream returns a
upstreamError
error, the error is returned (e.g., to Caddy) and the server will with500 Internal server error
. Instead, the upstream error should be sent back 50x errors to the client.