@Override
    protected void convertTrailers(HttpHeaders inputHeaders,
                                   io.netty.handler.codec.http.HttpHeaders outputHeaders) {
        ArmeriaHttpUtil.toNettyHttp1ServerTrailers(inputHeaders, outputHeaders, http1HeaderNaming);
    }
The ID of the last request whose response headers is written.
core/src/main/java/com/linecorp/armeria/server/ServerHttp1ObjectEncoder.java