序 本文主要研究一下feign的Contract Contract feign-core-10.2.3-sources.jar!/feign/Contract.java {代码...} Contract定义了parseAndValidatateMetadata方法，该方法返回List形式的MethodMetadata Contract.BaseContract feign-core-10.2.3-sources.jar!/feign/Contract.java {代码...} Contract.BaseContract是个抽...

feign-hystrix-10.2.3-sources.jar!/feign/hystrix/HystrixInvocationHandler.java

spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/Targeter.java

Retryer继承了Cloneable接口，它定义了continueOrPropagate、clone方法；它内置了一个名为Default以及名为NEVER_RETRY的实现

RequestInterceptor接口定义了apply方法，其参数为RequestTemplate；它有一个抽象类为BaseRequestInterceptor，还有几个实现类分别为BasicAuthRequestInterceptor、FeignAcceptGzipEncodingInterceptor、FeignContentGzipEncodingInterceptor

spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/FeignClientFactoryBean.java

spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/FeignClientBuilder.java

spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/ribbon/RetryableFeignLoadBalancer.java

spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/ribbon/FeignLoadBalancer.java