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Tells whether this entity depends on an underlying stream.
Streamed entities should return true until the
content has been consumed, false afterwards.
Self-contained entities should return false.
Wrapping entities should delegate this call to the wrapped entity.
The content of a streamed entity is consumed when the stream
returned by IHttpEntity.Content has been read to EOF,
or after IHttpEntity.ConsumeContent has been called.
If a streamed entity can not detect whether the stream has been
read to EOF, it should return true until
IHttpEntity.ConsumeContent is called.