HttpMessageContent Derived class which can encapsulate an or an as an entity with media type "application/http".

 MultipartFileData Represents a multipart file data.

 MultipartMemoryStreamProvider Represents a multipart memory stream provider.

 MultipartRelatedStreamProvider Represents the provider for the multipart related multistream.

 ObjectContent Contains a value as well as an associated that will be used to serialize the value when writing this content.

 ObjectContent`1 Generic form of .

 PushStreamContent Enables scenarios where a data producer wants to write directly (either synchronously or asynchronously) using a stream.

 UnsupportedMediaTypeException Defines an exception type for signalling that a request's media type was not supported.

 HttpClientExtensions Extension methods that aid in making formatted requests using .

 HttpClientFactory Represents the factory for creating new instance of .

 HttpContentExtensions Specifies extension methods to allow strongly typed objects to be read from HttpContent instances.

 HttpContentMessageExtensions Provides extension methods to read and entities from instances.

 HttpContentMultipartExtensions Extension methods to read MIME multipart entities from instances.

 MultipartStreamProvider Represents a stream provider that examines the headers provided by the MIME multipart parser as part of the MIME multipart extension methods (see ) and decides what kind of stream to return for the body part to be written to.