# Package org.apache.hc.core5.http

Core HTTP transport component APIs.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  ClassicHttpRequest | 'Classic' `HttpRequest` message that can enclose `HttpEntity`.
  ClassicHttpResponse | 'Classic' `HttpResponse` message that can enclose `HttpEntity`.
  ConnectionReuseStrategy | Interface for deciding whether a connection can be re-used for subsequent requests and should be kept alive.
  ContentLengthStrategy | Represents a strategy to determine length of the enclosed content entity based on properties of the HTTP message.
  EntityDetails | Details of an entity transmitted by a message.
  ExceptionListener |
  FormattedHeader | An HTTP header which is already formatted.
  Header | Represents an HTTP header field consisting of a field name and a field value.
  HeaderElement | Represents an element of an HTTP `header` value consisting of a name / value pair and a number of optional name / value parameters.
  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.
  HttpEntityContainer | Contains an `HttpEntity`.
  HttpMessage | HTTP messages consist of requests from client to server and responses from server to client.
  HttpRequest | A request message from a client to a server includes, within the first line of that message, the method to be applied to the resource, the identifier of the resource, and the protocol version in use.
  HttpRequestFactory<T extends HttpRequest> | A factory for `HttpRequest` objects.
  HttpRequestInterceptor | HTTP protocol interceptor is a routine that implements a specific aspect of the HTTP protocol.
  HttpRequestMapper<T> | This class can be used to resolve an object matching a particular `HttpRequest`.
  HttpResponse | After receiving and interpreting a request message, a server responds with an HTTP response message.
  HttpResponseFactory<T extends HttpResponse> | A factory for `HttpResponse` objects.
  HttpResponseInterceptor | HTTP protocol interceptor is a routine that implements a specific aspect of the HTTP protocol.
  MessageHeaders | Messages head consisting of multiple message headers.
  NameValuePair | A name-value pair parameter used as an element of HTTP messages.
  ProtocolVersionParser.Factory |
  ReasonPhraseCatalog | Interface for obtaining reason phrases for HTTP status codes.
  SocketModalCloseable | A generic `ModalCloseable` backed by a network socket.

- Class Summary
  Class | Description
  --- | ---
  Chars | Commons chars used by HTTP/1.1 protocol.
  ContentType | Content type information consisting of a MIME type and an optional charset.
  EndpointDetails | HTTP connection endpoint details.
  HeaderElements | Constants for frequently used Header elements.
  HttpHeaders | Constants enumerating standard and common HTTP headers.
  HttpHost | Component that holds all details needed to describe an HTTP connection to a host.
  HttpStatus | Constants enumerating the HTTP status codes.
  HttpVersion | Represents an HTTP version.
  Message<H extends MessageHeaders,B> | Generic message consisting of a message head and a message body.
  ProtocolVersion | Represents a protocol version.
  ProtocolVersionParser |

- Enum Summary
  Enum | Description
  --- | ---
  Method | Common HTTP methods defined by the HTTP specification.
  URIScheme | Enumerates supported URI schemes.

- Exception Summary
  Exception | Description
  --- | ---
  ConnectionClosedException | Signals that the connection has been closed unexpectedly.
  ConnectionRequestTimeoutException | Signals timeout requesting connection.
  ContentTooLongException | Signals that HTTP entity content is too long.
  HttpException | Signals that an HTTP exception has occurred.
  HttpStreamResetException | Signals HTTP protocol error that renders the actual HTTP data stream unreliable.
  LengthRequiredException | Signals message rejection due to missing content length.
  MalformedChunkCodingException | Signals a malformed chunked stream.
  MessageConstraintException | Signals a message constraint violation.
  MethodNotSupportedException | Signals that an HTTP method is not supported.
  MisdirectedRequestException | Signals a misdirected request (the server is not authoritative to handle the request).
  NoHttpResponseException | Signals that the target server failed to respond with a valid HTTP response.
  NotImplementedException | Signals an unsupported / unimplemented feature of the HTTP protocol.
  ParseException | Signals a protocol exception due to failure to parse a message element.
  ProtocolException | Signals that an HTTP protocol violation has occurred.
  RequestHeaderFieldsTooLargeException | Signals request header field length or total field size violation.
  RequestNotExecutedException | `ConnectionClosedException` subclass that signals requests cannot not be executed due to the connection being closed.
  StreamClosedException | Signals that data stream has already been closed.
  TruncatedChunkException | Signals a truncated chunk in a chunked stream.
  UnsupportedHttpVersionException | Signals an unsupported version of the HTTP protocol.

## Package org.apache.hc.core5.http Description

Core HTTP transport component APIs.

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`.

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