org.springframework.http.client
Interfaces 
ClientHttpRequest
ClientHttpRequestExecution
ClientHttpRequestFactory
ClientHttpRequestInterceptor
ClientHttpResponse
Classes 
AbstractClientHttpRequest
AbstractClientHttpRequestFactoryWrapper
AbstractClientHttpResponse
BufferingClientHttpRequestFactory
HttpComponentsAndroidClientHttpRequestFactory
HttpComponentsClientHttpRequestFactory
InterceptingClientHttpRequestFactory
OkHttpClientHttpRequestFactory
SimpleClientHttpRequestFactory