@Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
                          .add("order", order)
                          .add("route", route)
                          .add("pathVariables", pathVariables)
                          .add("serviceDescriptor", serviceDescriptor)
                          .add("methodDescriptor", methodDescriptor)
                          .add("parameters", parameters)
                          .toString();
    }
Returns the {@link HttpRule} of this HTTP API.
grpc/src/main/java/com/linecorp/armeria/internal/server/grpc/HttpEndpointSpecification.java