fix: ensure upstream scheme is set only if not already defined in HTT… #2691
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…P route translation
Type of change:
What this PR does / why we need it:
Just like what ingress translate does, it fixes the issue where httproute's schema is reset by appProtocolToUpstreamScheme after being obtained in translateBackendRef.
https://apisix.apache.org/zh/docs/ingress-controller/getting-started/load-balancing/
When testing with the above example, I found that the schema generated by ADC is http, but what is actually desired is https, and the Gateway API HTTPRoute is being used.
Pre-submission checklist: