Mercurial > hg > nginx-quic
annotate src/core/ngx_times.h @ 6750:cb330cd39030 stable-1.10
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> |
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date | Tue, 24 May 2016 17:37:52 +0300 |
parents | 777202558122 |
children | 76e7e20cda05 |
rev | line source |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #ifndef _NGX_TIMES_H_INCLUDED_ |
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9 #define _NGX_TIMES_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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563 | 16 typedef struct { |
17 time_t sec; | |
18 ngx_uint_t msec; | |
19 ngx_int_t gmtoff; | |
20 } ngx_time_t; | |
21 | |
22 | |
499 | 23 void ngx_time_init(void); |
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24 void ngx_time_update(void); |
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25 void ngx_time_sigsafe_update(void); |
455 | 26 u_char *ngx_http_time(u_char *buf, time_t t); |
27 u_char *ngx_http_cookie_time(u_char *buf, time_t t); | |
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28 void ngx_gmtime(time_t t, ngx_tm_t *tp); |
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29 |
2162 | 30 time_t ngx_next_time(time_t when); |
31 #define ngx_next_time_n "mktime()" | |
32 | |
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563 | 34 extern volatile ngx_time_t *ngx_cached_time; |
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563 | 36 #define ngx_time() ngx_cached_time->sec |
37 #define ngx_timeofday() (ngx_time_t *) ngx_cached_time | |
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563 | 39 extern volatile ngx_str_t ngx_cached_err_log_time; |
40 extern volatile ngx_str_t ngx_cached_http_time; | |
41 extern volatile ngx_str_t ngx_cached_http_log_time; | |
3873 | 42 extern volatile ngx_str_t ngx_cached_http_log_iso8601; |
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43 extern volatile ngx_str_t ngx_cached_syslog_time; |
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45 /* |
557 | 46 * milliseconds elapsed since epoch and truncated to ngx_msec_t, |
47 * used in event timers | |
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48 */ |
563 | 49 extern volatile ngx_msec_t ngx_current_msec; |
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52 #endif /* _NGX_TIMES_H_INCLUDED_ */ |