Message
Interfaces, Classes and Traits
- MessageInterface
 - HTTP messages consist of requests from a client to a server and responses from a server to a client. This interface defines the methods common to each.
 - RequestInterface
 - Representation of an outgoing, client-side request.
 - ResponseInterface
 - Representation of an outgoing, server-side response.
 - ServerRequestInterface
 - Representation of an incoming, server-side HTTP request.
 - StreamInterface
 - Describes a data stream.
 - UploadedFileInterface
 - Value object representing a file uploaded through an HTTP request.
 - UriInterface
 - Value object representing a URI.