Mercurial > hg > nginx

comparison src/http/v2/ngx_http_v2.h @ 6566:ce94f07d5082

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
HTTP/2: implemented preread buffer for request body (closes #959). Previously, the stream's window was kept zero in order to prevent a client from sending the request body before it was requested (see 887cca40ba6a for details). Until such initial window was acknowledged all requests with data were rejected (see 0aa07850922f for details). That approach revealed a number of problems: 1. Some clients (notably MS IE/Edge, Safari, iOS applications) show an error or even crash if a stream is rejected; 2. This requires at least one RTT for every request with body before the client receives window update and able to send data. To overcome these problems the new directive "http2_body_preread_size" is introduced. It sets the initial window and configures a special per stream preread buffer that is used to save all incoming data before the body is requested and processed. If the directive's value is lower than the default initial window (65535), as previously, all streams with data will be rejected until the new window is acknowledged. Otherwise, no special processing is used and all requests with data are welcome right from the connection start. The default value is chosen to be 64k, which is bigger than the default initial window. Setting it to zero is fully complaint to the previous behavior.
author Valentin Bartenev <vbart@nginx.com>
date Tue, 24 May 2016 17:37:52 +0300
parents 0aa07850922f
children ad736705a744 09cf90250844
comparison
equal deleted inserted replaced
6565:3af0e65a461a 6566:ce94f07d5082
43 #define NGX_HTTP_V2_ACK_FLAG 0x01 43 #define NGX_HTTP_V2_ACK_FLAG 0x01
44 #define NGX_HTTP_V2_END_STREAM_FLAG 0x01 44 #define NGX_HTTP_V2_END_STREAM_FLAG 0x01
45 #define NGX_HTTP_V2_END_HEADERS_FLAG 0x04 45 #define NGX_HTTP_V2_END_HEADERS_FLAG 0x04
46 #define NGX_HTTP_V2_PADDED_FLAG 0x08 46 #define NGX_HTTP_V2_PADDED_FLAG 0x08
47 #define NGX_HTTP_V2_PRIORITY_FLAG 0x20 47 #define NGX_HTTP_V2_PRIORITY_FLAG 0x20
48
49 #define NGX_HTTP_V2_MAX_WINDOW ((1U << 31) - 1)
50 #define NGX_HTTP_V2_DEFAULT_WINDOW 65535
48 51
49 52
50 typedef struct ngx_http_v2_connection_s ngx_http_v2_connection_t; 53 typedef struct ngx_http_v2_connection_s ngx_http_v2_connection_t;
51 typedef struct ngx_http_v2_node_s ngx_http_v2_node_t; 54 typedef struct ngx_http_v2_node_s ngx_http_v2_node_t;
52 typedef struct ngx_http_v2_out_frame_s ngx_http_v2_out_frame_t; 55 typedef struct ngx_http_v2_out_frame_s ngx_http_v2_out_frame_t;
172 * send_window to become negative, hence it's signed. 175 * send_window to become negative, hence it's signed.
173 */ 176 */
174 ssize_t send_window; 177 ssize_t send_window;
175 size_t recv_window; 178 size_t recv_window;
176 179
180 ngx_buf_t *preread;
181
177 ngx_http_v2_out_frame_t *free_frames; 182 ngx_http_v2_out_frame_t *free_frames;
178 ngx_chain_t *free_frame_headers; 183 ngx_chain_t *free_frame_headers;
179 ngx_chain_t *free_bufs; 184 ngx_chain_t *free_bufs;
180 185
181 ngx_queue_t queue; 186 ngx_queue_t queue;