fix duplicated assignment to response header in log (#40)
fix duplicated assignment to response header in log (#40)

Signed-off-by: Pengyuan Bian <3fba0f506a67f89997a476dc01d0a9fd7e1ac563@google.com>
envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,istio/envoy,istio/envoy,envoyproxy/envoy-wasm,istio/envoy,istio/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy-wasm,istio/envoy,envoyproxy/envoy-wasm,istio/envoy