Struct Chain 

pub struct Chain<A, B> { /* private fields */ }

Available on crate features http and std only.

A Body that yields every frame of first, then every frame of second.

Trailers of first are held back and merged into those of second (whose values win on conflicts), as trailers must end the stream. An error of either body ends the chain, so second is never polled after first failed.

This is also what makes a bounded collect reversible: the bytes already read can be re-prepended in front of the unread remainder so the original body can be forwarded untouched (see CollectError::into_full_body).

See BodyExt::chain for more information.

Implementations

impl<A, B> Chain<A, B>

pub fn new(first: A, second: B) -> Chain<A, B>

Create a new Chain yielding all of first before all of second.

Trait Implementations

impl<A, B> Body for Chain<A, B>

where A: Body, B: Body<Data = <A as Body>::Data>, <A as Body>::Error: Into<Box<dyn Error + Sync + Send>>, <B as Body>::Error: Into<Box<dyn Error + Sync + Send>>,

type Data = <A as Body>::Data

Values yielded by the Body.

type Error = Box<dyn Error + Sync + Send>

The error type this Body might generate.

fn poll_frame( self: Pin<&mut Chain<A, B>>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<<Chain<A, B> as Body>::Data>, <Chain<A, B> as Body>::Error>>>

Attempt to pull out the next frame of this stream.

fn is_end_stream(&self) -> bool

A hint that may return true when the end of stream has been reached.

fn size_hint(&self) -> SizeHint

A hint that returns the bounds on the remaining length of the stream.

impl<'__pin, A, B> Unpin for Chain<A, B>

where <PinnedFieldsOfHelperStruct<__Origin<'__pin, A, B>> as PinnedFieldsOfHelperTrait>::Actual: Unpin,