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