org.apache.commons.httpclient
Interfaces 
Credentials
HttpConnectionManager
HttpMethod
HttpMethodRetryHandler
MethodRetryHandler
Classes 
ChunkedInputStream
ChunkedOutputStream
ConnectMethod
ContentLengthInputStream
Cookie
DefaultHttpMethodRetryHandler
DefaultMethodRetryHandler
Header
HeaderElement
HeaderGroup
HostConfiguration
HttpClient
HttpConnection
HttpConstants
HttpHost
HttpMethodBase
HttpParser
HttpState
HttpStatus
HttpsURL
HttpURL
HttpVersion
MultiThreadedHttpConnectionManager
NameValuePair
NTCredentials
ProxyClient
ProxyClient.ConnectResponse
ProxyHost
SimpleHttpConnectionManager
StatusLine
URI
URI.LocaleToCharsetMap
UsernamePasswordCredentials
Exceptions 
CircularRedirectException
ConnectionPoolTimeoutException
ConnectTimeoutException
HttpContentTooLargeException
HttpException
HttpRecoverableException
InvalidRedirectLocationException
NoHttpResponseException
ProtocolException
RedirectException
URI.DefaultCharsetChanged
URIException
Errors 
HttpClientError