Trait http_body::Body

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pub trait Body {
    type Data: Buf;
    type Error;

    // Required method
    fn poll_frame(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>;

    // Provided methods
    fn is_end_stream(&self) -> bool { ... }
    fn size_hint(&self) -> SizeHint { ... }
}
Expand description

Trait representing a streaming body of a Request or Response.

Individual frames are streamed via the poll_frame function, which asynchronously yields instances of Frame<Data>.

Frames can contain a data buffer of type Self::Data. Frames can also contain an optional set of trailers used to finalize the request/response exchange. This is mostly used when using the HTTP/2.0 protocol.

The size_hint function provides insight into the total number of bytes that will be streamed.

Required Associated Types§

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type Data: Buf

Values yielded by the Body.

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type Error

The error type this Body might generate.

Required Methods§

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fn poll_frame( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>

Attempt to pull out the next data buffer of this stream.

Provided Methods§

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fn is_end_stream(&self) -> bool

Returns true when the end of stream has been reached.

An end of stream means that poll_frame will return None.

A return value of false does not guarantee that a value will be returned from poll_frame.

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fn size_hint(&self) -> SizeHint

Returns the bounds on the remaining length of the stream.

When the exact remaining length of the stream is known, the upper bound will be set and will equal the lower bound.

Implementations on Foreign Types§

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impl Body for String

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type Data = Bytes

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type Error = Infallible

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fn poll_frame( self: Pin<&mut Self>, _cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>

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fn is_end_stream(&self) -> bool

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fn size_hint(&self) -> SizeHint

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impl<B: Body> Body for Request<B>

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type Data = <B as Body>::Data

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type Error = <B as Body>::Error

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fn poll_frame( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>

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fn is_end_stream(&self) -> bool

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fn size_hint(&self) -> SizeHint

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impl<B: Body> Body for Response<B>

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type Data = <B as Body>::Data

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type Error = <B as Body>::Error

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fn poll_frame( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>

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fn is_end_stream(&self) -> bool

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fn size_hint(&self) -> SizeHint

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impl<P> Body for Pin<P>
where P: Unpin + DerefMut, P::Target: Body,

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type Data = <<P as Deref>::Target as Body>::Data

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type Error = <<P as Deref>::Target as Body>::Error

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fn poll_frame( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>

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fn is_end_stream(&self) -> bool

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fn size_hint(&self) -> SizeHint

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impl<T: Body + Unpin + ?Sized> Body for &mut T

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type Data = <T as Body>::Data

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type Error = <T as Body>::Error

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fn poll_frame( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>

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fn is_end_stream(&self) -> bool

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fn size_hint(&self) -> SizeHint

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impl<T: Body + Unpin + ?Sized> Body for Box<T>

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type Data = <T as Body>::Data

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type Error = <T as Body>::Error

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fn poll_frame( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>

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fn is_end_stream(&self) -> bool

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fn size_hint(&self) -> SizeHint

Implementors§