ronething commented on code in PR #2601:
URL: 
https://github.com/apache/apisix-ingress-controller/pull/2601#discussion_r2430903509


##########
internal/adc/translator/apisixroute.go:
##########
@@ -352,50 +355,57 @@ func (t *Translator) translateApisixRouteHTTPBackend(tctx 
*provider.TranslateCon
                upstream = u
        }
        var (
-               err   error
-               nodes adc.UpstreamNodes
+               err      error
+               nodes    adc.UpstreamNodes
+               protocol string
        )
        if backend.ResolveGranularity == apiv2.ResolveGranularityService {
-               nodes, err = 
t.translateApisixRouteBackendResolveGranularityService(tctx, auNN, backend)
+               nodes, protocol, err = 
t.translateApisixRouteBackendResolveGranularityService(tctx, auNN, backend)
        } else {
-               nodes, err = 
t.translateApisixRouteBackendResolveGranularityEndpoint(tctx, auNN, backend)
+               nodes, protocol, err = 
t.translateApisixRouteBackendResolveGranularityEndpoint(tctx, auNN, backend)
        }
        if err != nil {
                return nil, err
        }
        upstream.Nodes = nodes
+       if upstream.Scheme == "" {
+               upstream.Scheme = appProtocolToUpstreamScheme(protocol)
+       }
+       if protocol == internaltypes.AppProtocolWS || protocol == 
internaltypes.AppProtocolWSS {
+               *enableWebsocket = ptr.To(true)
+       }
        if backend.Weight != nil {
                upstream.Labels["meta_weight"] = 
strconv.FormatInt(int64(*backend.Weight), 10)
        }
        return upstream, nil
 }
 
-func (t *Translator) translateApisixRouteBackendResolveGranularityService(tctx 
*provider.TranslateContext, arNN types.NamespacedName, backend 
apiv2.ApisixRouteHTTPBackend) (adc.UpstreamNodes, error) {
+func (t *Translator) translateApisixRouteBackendResolveGranularityService(tctx 
*provider.TranslateContext, arNN types.NamespacedName, backend 
apiv2.ApisixRouteHTTPBackend) (adc.UpstreamNodes, string, error) {

Review Comment:
   It seems that this function does not actually process the `protocol` and 
always returns an empty string?



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