@Override
	public String toString() {
		return target.toString();
	}
{@link InvocationHandler} handle invocation that protected by Sentinel.

@author <a href="mailto:fangjian0423@gmail.com">Jim</a>
spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-sentinel/src/main/java/com/alibaba/cloud/sentinel/feign/SentinelInvocationHandler.java