body size

[silence-coding]

If a request without a body does not carry content-length or chunk, the size_hint method of the body can obtain the correct value in the HTTP1 scenario but cannot obtain the correct value in the H2 scenario.

    fn size_hint(&self) -> SizeHint {
        match self.kind {
            Kind::Once(Some(ref val)) => SizeHint::with_exact(val.len() as u64),
  //HTTP1
            Kind::Once(None) => SizeHint::with_exact(0), 
            #[cfg(feature = "stream")]
            Kind::Wrapped(..) => SizeHint::default(),
//HTTP2
            Kind::Chan { content_length, .. } | Kind::H2 { content_length, .. } => {
                let mut hint = SizeHint::default();

                if let Some(content_length) = content_length.into_opt() {
                    hint.set_exact(content_length);
                }

                hint
            }
        }
    }

[silence-coding]

Whether the body size can be corrected based on is_end_stream to determine whether the request is empty.

    /// Returns true if the receive half has reached the end of stream.
    ///
    /// A return value of `true` means that calls to `poll` and `poll_trailers`
    /// will both return `None`.
    pub fn is_end_stream(&self) -> bool {
        self.inner.inner.is_end_stream()
    }

[seanmonstar]

I'm not sure what you mean. The code you pasted looks correct. What exactly is wrong?

[silence-coding]

@seanmonstar When a client sends a request without content, the size_hint can obtain the correct body size of 0 in the HTTP1 scenario, but the size_hint cannot determine the body size of the request in the HTTP2 scenario.

DELETE /rest/test/nobody HTTP/1.1\r\n
User-Agent: insomnia/2021.6.0\r\n
Accept: */*\r\n\r\n