Streaming small chunks

[ngrondin]

I'm trying to create a service that will stream a multipart/x-mixed-replace of image/jpeg for a video streaming service.
Each image is roughly 22k and I'd like them to be sent to the I/O stream at the end of every image so the client can display them as it waits for the next.
The stream I've built retrieves the next image bytes via a channel receiver, adds the HTTP part headers and yields the resulting bytes.
The issue I'm getting is that the client is receiving 2 images at once, thus dropping the frame rate by 2 for the end user.

This seems to be because the Dispatcher will only send the buffer once the size has reached the MAX_BUFFER_SIZE and given buffer size is 32k, it takes 2 images to trigger the send (

actix-web/actix-http/src/h1/dispatcher.rs

Line 496 in fd81e6e

while this.write_buf.len() < super::payload::MAX_BUFFER_SIZE {

)
Is there an elegant way to force the write_buf to flush upon each yield.

Any help appreciated