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Android APIs
Added in API level 1
package

org.apache.http

The core interfaces and classes of the HTTP components. These deal with the fundamental things required for using the HTTP protocol, such as representing a message including it's headers and optional entity , and connections over which messages are sent. In order to prepare messages before sending or after receiving, there are interceptors for requests and responses .

Interfaces

ConnectionReuseStrategy Interface for deciding whether a connection should be kept alive. 
FormattedHeader An HTTP header which is already formatted. 
Header Represents an HTTP header field. 
HeaderElement One element of an HTTP header value. 
HeaderElementIterator A type-safe iterator for HeaderElement objects. 
HeaderIterator A type-safe iterator for Header objects. 
HttpClientConnection An HTTP connection for use on the client side. 
HttpConnection A generic HTTP connection, useful on client and server side. 
HttpConnectionMetrics The point of access to the statistics of an HttpConnection . 
HttpEntity An entity that can be sent or received with an HTTP message. 
HttpEntityEnclosingRequest A request with an entity. 
HttpInetConnection An HTTP connection over the Internet Protocol (IP). 
HttpMessage A generic HTTP message. 
HttpRequest An HTTP request. 
HttpRequestFactory A factory for HttpRequest objects. 
HttpRequestInterceptor Processes a request. 
HttpResponse An HTTP response. 
HttpResponseFactory A factory for HttpResponse objects. 
HttpResponseInterceptor Processes a response. 
HttpServerConnection An HTTP connection for use on the server side. 
HttpStatus Constants enumerating the HTTP status codes. 
NameValuePair A simple class encapsulating an attribute/value pair. 
ReasonPhraseCatalog Interface for obtaining reason phrases for HTTP status codes. 
RequestLine The first line of an HttpRequest . 
StatusLine Represents a status line as returned from a HTTP server. 
TokenIterator An iterator for String tokens. 

Classes

HttpHost Holds all of the variables needed to describe an HTTP connection to a host. 
HttpVersion Represents an HTTP version, as specified in RFC 2616. 
ProtocolVersion Represents a protocol version, as specified in RFC 2616. 

Exceptions

ConnectionClosedException Indicates that a connection has been closed. 
HttpException Signals that an HTTP exception has occurred. 
MalformedChunkCodingException Signals a malformed chunked stream. 
MethodNotSupportedException Indicates that an HTTP method is not supported. 
NoHttpResponseException

Signals that the target server failed to respond with a valid HTTP response. 

ParseException Indicates a parse error. 
ProtocolException Signals that an HTTP protocol violation has occurred. 
UnsupportedHttpVersionException Indicates an unsupported version of the HTTP protocol.