更换Feign默认的Client

测试

1.启动访问-ch4-3-httpclient

http://localhost:8010/search/github?str=spring-cloud-openfeign

2.启动访问-ch4-3-okhttp

http://localhost:8011/search/github?str=spring-cloud-openfeign 实际调用的是: https://api.github.com/search/repositories?q=spring-cloud-openfeign