Replace localhost with 127.0.0.1 to prevent DNS resolving problem (fi…

…ssion#1227)

pkg/fetcher/fetcher.go

@@ -615,14 +615,17 @@ func (fetcher *Fetcher) SpecializePod(ctx context.Context, fetchReq types.Functi
  return errors.Wrap(err, "error encoding load request")
  }
 
+ // Instead of using "localhost", here we use "127.0.0.1" for
+ // inter-pod communication to prevent wrongly record returned from DNS.
+
  if loadReq.EnvVersion >= 2 {
  contentType = "application/json"
- specializeURL = "https://localhost:8888/v2/specialize"
+ specializeURL = "https://127.0.0.1:8888/v2/specialize"
  reader = bytes.NewReader(loadPayload)
  fetcher.logger.Info("calling environment v2 specialization endpoint")
  } else {
  contentType = "text/plain"
- specializeURL = "https://localhost:8888/specialize"
+ specializeURL = "https://127.0.0.1:8888/specialize"
  reader = bytes.NewReader([]byte{})
  fetcher.logger.Info("calling environment v1 specialization endpoint")
  }