annotate src/http/ngx_http_cache.h @ 5878:2c89956b6a76

Cache: hash of Vary headers now stored in cache. To cache responses with Vary, we now calculate hash of headers listed in Vary, and return the response from cache only if new request headers match. As of now, only one variant of the same resource can be stored in cache.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 27 Oct 2014 21:13:58 +0300
parents 44b9ab7752e3
children c525c0454aa5
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #ifndef _NGX_HTTP_CACHE_H_INCLUDED_
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9 #define _NGX_HTTP_CACHE_H_INCLUDED_
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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14 #include <ngx_http.h>
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16
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17 #define NGX_HTTP_CACHE_MISS 1
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18 #define NGX_HTTP_CACHE_BYPASS 2
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19 #define NGX_HTTP_CACHE_EXPIRED 3
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20 #define NGX_HTTP_CACHE_STALE 4
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21 #define NGX_HTTP_CACHE_UPDATING 5
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22 #define NGX_HTTP_CACHE_REVALIDATED 6
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23 #define NGX_HTTP_CACHE_HIT 7
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24 #define NGX_HTTP_CACHE_SCARCE 8
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25
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26 #define NGX_HTTP_CACHE_KEY_LEN 16
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27 #define NGX_HTTP_CACHE_ETAG_LEN 42
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28 #define NGX_HTTP_CACHE_VARY_LEN 42
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29
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30 #define NGX_HTTP_CACHE_VERSION 3
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33 typedef struct {
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34 ngx_uint_t status;
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35 time_t valid;
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36 } ngx_http_cache_valid_t;
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37
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38
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39 typedef struct {
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40 ngx_rbtree_node_t node;
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41 ngx_queue_t queue;
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42
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43 u_char key[NGX_HTTP_CACHE_KEY_LEN
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44 - sizeof(ngx_rbtree_key_t)];
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45
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46 unsigned count:20;
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47 unsigned uses:10;
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48 unsigned valid_msec:10;
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49 unsigned error:10;
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50 unsigned exists:1;
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51 unsigned updating:1;
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52 unsigned deleting:1;
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53 /* 11 unused bits */
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54
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55 ngx_file_uniq_t uniq;
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56 time_t expire;
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57 time_t valid_sec;
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58 size_t body_start;
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59 off_t fs_size;
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60 } ngx_http_file_cache_node_t;
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61
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62
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63 struct ngx_http_cache_s {
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64 ngx_file_t file;
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65 ngx_array_t keys;
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66 uint32_t crc32;
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67 u_char key[NGX_HTTP_CACHE_KEY_LEN];
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68
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69 ngx_file_uniq_t uniq;
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70 time_t valid_sec;
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71 time_t last_modified;
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72 time_t date;
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73
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74 ngx_str_t etag;
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75 ngx_str_t vary;
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76 u_char variant[NGX_HTTP_CACHE_KEY_LEN];
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77
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78 size_t header_start;
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79 size_t body_start;
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80 off_t length;
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81 off_t fs_size;
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82
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83 ngx_uint_t min_uses;
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84 ngx_uint_t error;
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85 ngx_uint_t valid_msec;
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86
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87 ngx_buf_t *buf;
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88
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89 ngx_http_file_cache_t *file_cache;
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90 ngx_http_file_cache_node_t *node;
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91
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92 ngx_msec_t lock_timeout;
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93 ngx_msec_t wait_time;
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94
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95 ngx_event_t wait_event;
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96
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97 unsigned lock:1;
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98 unsigned waiting:1;
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99
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100 unsigned updated:1;
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101 unsigned updating:1;
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102 unsigned exists:1;
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103 unsigned temp_file:1;
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104 };
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106
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107 typedef struct {
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108 ngx_uint_t version;
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109 time_t valid_sec;
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110 time_t last_modified;
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111 time_t date;
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112 uint32_t crc32;
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113 u_short valid_msec;
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114 u_short header_start;
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115 u_short body_start;
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116 u_char etag_len;
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117 u_char etag[NGX_HTTP_CACHE_ETAG_LEN];
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118 u_char vary_len;
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119 u_char vary[NGX_HTTP_CACHE_VARY_LEN];
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120 u_char variant[NGX_HTTP_CACHE_KEY_LEN];
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121 } ngx_http_file_cache_header_t;
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122
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123
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124 typedef struct {
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125 ngx_rbtree_t rbtree;
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126 ngx_rbtree_node_t sentinel;
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127 ngx_queue_t queue;
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128 ngx_atomic_t cold;
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129 ngx_atomic_t loading;
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130 off_t size;
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131 } ngx_http_file_cache_sh_t;
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132
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133
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134 struct ngx_http_file_cache_s {
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Igor Sysoev <igor@sysoev.ru>
parents: 2616
diff changeset
135 ngx_http_file_cache_sh_t *sh;
2592
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parents: 477
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136 ngx_slab_pool_t *shpool;
469
2ff194b74f1e nginx-0.1.9-RELEASE import
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parents: 444
diff changeset
137
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parents: 477
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138 ngx_path_t *path;
201
267ea1d98683 nginx-0.0.1-2003-11-30-23:03:18 import
Igor Sysoev <igor@sysoev.ru>
parents: 200
diff changeset
139
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Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
140 off_t max_size;
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Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
141 size_t bsize;
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Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
142
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
143 time_t inactive;
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Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
144
3974
d10bcb07d9d4 loader_files, loader_sleep, and loader_threshold
Igor Sysoev <igor@sysoev.ru>
parents: 3899
diff changeset
145 ngx_uint_t files;
d10bcb07d9d4 loader_files, loader_sleep, and loader_threshold
Igor Sysoev <igor@sysoev.ru>
parents: 3899
diff changeset
146 ngx_uint_t loader_files;
2616
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Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
147 ngx_msec_t last;
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Igor Sysoev <igor@sysoev.ru>
parents: 3899
diff changeset
148 ngx_msec_t loader_sleep;
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parents: 3899
diff changeset
149 ngx_msec_t loader_threshold;
201
267ea1d98683 nginx-0.0.1-2003-11-30-23:03:18 import
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parents: 200
diff changeset
150
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
151 ngx_shm_zone_t *shm_zone;
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
152 };
200
abeaebe0a33c nginx-0.0.1-2003-11-28-20:41:47 import
Igor Sysoev <igor@sysoev.ru>
parents: 199
diff changeset
153
197
0b81c7a0b133 nginx-0.0.1-2003-11-27-10:45:22 import
Igor Sysoev <igor@sysoev.ru>
parents: 195
diff changeset
154
3698
d11227f0107f rename ngx_http_file_cache_create() to ngx_http_file_cache_new()
Igor Sysoev <igor@sysoev.ru>
parents: 3697
diff changeset
155 ngx_int_t ngx_http_file_cache_new(ngx_http_request_t *r);
3699
b0a0686a85bb proxy_cache_pass, fastcgi_cache_bypass, uwsgi_cache_bypass, scgi_cache_bypass
Igor Sysoev <igor@sysoev.ru>
parents: 3698
diff changeset
156 ngx_int_t ngx_http_file_cache_create(ngx_http_request_t *r);
2592
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
157 void ngx_http_file_cache_create_key(ngx_http_request_t *r);
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parents: 477
diff changeset
158 ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r);
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parents: 477
diff changeset
159 void ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf);
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parents: 477
diff changeset
160 void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf);
5441
43ccaf8e8728 Upstream: cache revalidation with conditional requests.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4412
diff changeset
161 void ngx_http_file_cache_update_header(ngx_http_request_t *r);
2592
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
162 ngx_int_t ngx_http_cache_send(ngx_http_request_t *);
3711
ce6ba077c270 several changes in cache cleanup handling:
Igor Sysoev <igor@sysoev.ru>
parents: 3699
diff changeset
163 void ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf);
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parents: 477
diff changeset
164 time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status);
199
a65b630b3a66 nginx-0.0.1-2003-11-28-11:40:40 import
Igor Sysoev <igor@sysoev.ru>
parents: 197
diff changeset
165
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
166 char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
167 void *conf);
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Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
168 char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
3a8a53c0c42f a prelimiary proxy cache support
Igor Sysoev <igor@sysoev.ru>
parents: 477
diff changeset
169 void *conf);
469
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Igor Sysoev <igor@sysoev.ru>
parents: 444
diff changeset
170
3526
62a4fd1e6e2c proxy_no_cache and fastcgi_no_cache
Igor Sysoev <igor@sysoev.ru>
parents: 3052
diff changeset
171
2952
0998606fbfd4 $upstream_cache_status
Igor Sysoev <igor@sysoev.ru>
parents: 2927
diff changeset
172 extern ngx_str_t ngx_http_cache_status[];
0998606fbfd4 $upstream_cache_status
Igor Sysoev <igor@sysoev.ru>
parents: 2927
diff changeset
173
199
a65b630b3a66 nginx-0.0.1-2003-11-28-11:40:40 import
Igor Sysoev <igor@sysoev.ru>
parents: 197
diff changeset
174
170
c42be4185301 nginx-0.0.1-2003-11-03-01:56:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
175 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */