QUIC: coalesce neighbouring stream send buffers. Previously a single STREAM frame was created for each buffer in stream output chain which is wasteful with respect to memory. The following changes were made in the stream send code: - ngx_quic_stream_send_chain() no longer calls ngx_quic_stream_send() and got a separate implementation that coalesces neighbouring buffers into a single frame - the new ngx_quic_stream_send_chain() respects the limit argument, which fixes sendfile_max_chunk and limit_rate - ngx_quic_stream_send() is reimplemented to call ngx_quic_stream_send_chain() - stream frame size limit is moved out to a separate function ngx_quic_max_stream_frame() - flow control is moved out to a separate function ngx_quic_max_stream_flow() - ngx_quic_stream_send_chain() is relocated next to ngx_quic_stream_send()

/*
 * Copyright (C) Nginx, Inc.
 * Copyright (C) Roman Arutyunyan
 */


#ifndef _NGX_HTTP_QUIC_H_INCLUDED_
#define _NGX_HTTP_QUIC_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


#define NGX_HTTP_QUIC_ALPN(s)         NGX_HTTP_QUIC_ALPN_DRAFT(s)
#define NGX_HTTP_QUIC_ALPN_DRAFT(s)   "\x05hq-" #s
#define NGX_HTTP_QUIC_ALPN_ADVERTISE  NGX_HTTP_QUIC_ALPN(NGX_QUIC_DRAFT_VERSION)


extern ngx_module_t  ngx_http_quic_module;


#endif /* _NGX_HTTP_QUIC_H_INCLUDED_ */