I'm using Zipkin for the exporter. I'm a bit curios about https://github.com/open-telemetry/opentelemetry-go/blob/master/exporters/trace/zipkin/zipkin.go#L109-L114

there is no defer resp.Body.Close() to avoid memory leak or consume the high resources in a server.

I'm quite not sure that this is a bug or not. Would you please help me to verify this?