public ServiceRequestContextBuilder service(HttpService service) {
        this.service = requireNonNull(service, "service");
        return this;
    }
Sets the {@link Service} that handles the request. If not set, a dummy {@link Service}, which always
returns a {@code "405 Method Not Allowed"} response, is used.
core/src/main/java/com/linecorp/armeria/server/ServiceRequestContextBuilder.java