org.apache.http
Interfaces 
ConnectionReuseStrategy
Header
HeaderElement
HttpClientConnection
HttpConnection
HttpEntity
HttpEntityEnclosingRequest
HttpInetConnection
HttpMessage
HttpRequest
HttpRequestFactory
HttpRequestInterceptor
HttpResponse
HttpResponseFactory
HttpResponseInterceptor
HttpServerConnection
HttpStatus
NameValuePair
ReasonPhraseCatalog
RequestLine
StatusLine
Classes 
HttpHost
HttpVersion
Exceptions 
ConnectionClosedException
HttpException
MalformedChunkCodingException
MethodNotSupportedException
NoHttpResponseException
ProtocolException
UnsupportedHttpVersionException