feign本身是通过FeignClientFactoryBean 创建出来的,feign的超时配置也在方法org.springframework.cloud.openfeign.FeignClientFactoryBean#configureUsingConfiguration中。此方法properties.isDefaultToProperties()的默认值是true,我们一般也不会去改它，所以一般是执行红方框中的逻辑。(1)先执行全局配置configureUsingConfiguration(context, builder)，(2)再执行属性配置类中FeignClientProperties的默认配置, (3)最后执行属性配置类FeignClientProperties中当前feign client特定的配置。这三个步骤的覆盖顺序是后者覆盖前者，也就是越往后优先级越高。默认情况下我们未做任何配置时，FeignClientProperties是空对象，也就是说此时只会执行步骤(1)的属性配置。

全局属性配置方法org.springframework.cloud.openfeign.FeignClientFactoryBean#configureUsingConfiguration回到spring容器中去取超时配置对象Request.Options

自动配置类相应方法为我们配置了一个Request.Options对象(当spring容器中不存在此类型的bean时)，

而LoadBalancerFeignClient.DEFAULT_OPTIONS的连接超时、读超时分别是10s、60s.

public class LoadBalancerFeignClient implements Client {

	static final Request.Options DEFAULT_OPTIONS = new Request.Options();
	//.....
}	
 public static class Options {

    private final long connectTimeout;
    private final TimeUnit connectTimeoutUnit;
    private final long readTimeout;
    private final TimeUnit readTimeoutUnit;
    private final boolean followRedirects;
    //.......
     /**
     * Creates the new Options instance using the following defaults:
     * <ul>
     * <li>Connect Timeout: 10 seconds</li>
     * <li>Read Timeout: 60 seconds</li>
     * <li>Follow all 3xx redirects</li>
     * </ul>
     */
    public Options() {
      this(10, TimeUnit.SECONDS, 60, TimeUnit.SECONDS, true);
    }
    //.......

 }