public void setProtocol(final Protocol protocol) {
        this.protocol = protocol;
    }
Set the protocol config.
@param protocol protocol config
shenyu-spring-boot-starter/shenyu-spring-boot-starter-client/shenyu-spring-boot-starter-client-motan/src/main/java/org/apache/shenyu/springboot/starter/client/motan/property/ShenyuMotanConfig.java