org.apache.http.protocol
Interfaces 
HttpContext
HttpExpectationVerifier
HttpProcessor
HttpRequestHandler
HttpRequestHandlerResolver
HttpRequestInterceptorList
HttpResponseInterceptorList
Classes 
BasicHttpProcessor
HTTP
HttpDateGenerator
HttpExecutionContext
HttpRequestExecutor
HttpRequestHandlerRegistry
HttpService
RequestConnControl
RequestContent
RequestExpectContinue
RequestTargetHost
RequestUserAgent
ResponseConnControl
ResponseContent
ResponseDate
ResponseServer
SyncHttpExecutionContext