解决FeignClient重试机制造成的接口幂等性

RequestTemplate template = buildTemplateFromArgs.create(argv);

executeAndDecode(template, options);

Retryer retryer = this.retryer.clone();
    while (true) {
      try {
        return executeAndDecode(template, options);
      } catch (RetryableException e) {
        try {
          retryer.continueOrPropagate(e);
        } catch (RetryableException th) {
          Throwable cause = th.getCause();
           // 重试结束 或则 不允许重试，则通过抛异常的形式终止 
          if (propagationPolicy == UNWRAP && cause != null) {
            throw cause;
          } else {
            throw th;
          }
        }
        if (logLevel != Logger.Level.NONE) {
          logger.logRetry(metadata.configKey(), logLevel);
        }
        continue;
      }
    }

    public Default() {
      this(100, SECONDS.toMillis(1), 5);
      }
 
    public Default(long period, long maxPeriod, int maxAttempts) {
      this.period = period;
      this.maxPeriod = maxPeriod;
      this.maxAttempts = maxAttempts;
      this.attempt = 1;
    }

        <dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>

  /**
     *
     * 注册一个重试Bean
     * 默认FeignClient不会进行重试，使用的是{@link feign.Retryer#NEVER_RETRY}
     *
     * @see FeignClientsConfiguration#feignRetryer()
     */
    @Bean
    public Retryer feignRetryer() {
        return new Retryer.Default();
    }