// running.
func (cw *chunkWriter) writeHeader(p []byte) {
	if cw.wroteHeader {
		return
	}
	cw.wroteHeader = true

	w := cw.res
	keepAlivesEnabled := w.conn.server.doKeepAlives()
	isHEAD := w.req.Method == "HEAD"

	// header is written out to w.conn.buf below. Depending on the
	// state of the handler, we either own the map or not. If we
	// don't own it, the exclude map is created lazily for

		}
	} else if len(clens) > 1 {
		// TODO: care? unlike http/1, it won't mess up our framing, so it's
		// more safe smuggling-wise to ignore.
	} else if f.StreamEnded() && !cs.isHead {
		res.ContentLength = 0
	}

	if cs.isHead {
		res.Body = http2noBody
		return res, nil
	}

	if f.StreamEnded() {
		if res.ContentLength > 0 {
			res.Body = http2missingBody{}
		} else {