Function encode_frame 

pub fn encode_frame(
    header: &FrameHeader,
    payload: &[u8],
    out: &mut [u8],
    max_frame_size: u32,
) -> Result<usize, Http2Error>

Encodes a frame into an output buffer. Spec §4.1.

Errors

• FrameTooLarge if payload.len() > max_frame_size.
• ShortPayload if the output buffer is too small.