Mercurial > hg > nginx
annotate src/http/v2/ngx_http_v2.h @ 9121:262c01782566
HTTP/2: removed server push (ticket #2432).
Although it has better implementation status than HTTP/3 server push,
it remains of limited use, with adoption numbers seen as negligible.
Per IETF 102 materials, server push was used only in 0.04% of sessions.
It was considered to be "difficult to use effectively" in RFC 9113.
Its use is further limited by badly matching to fetch/cache/connection
models in browsers, see related discussions linked from [1].
Server push was disabled in Chrome 106 [2].
The http2_push, http2_push_preload, and http2_max_concurrent_pushes
directives are made obsolete. In particular, this essentially reverts
7201:641306096f5b and 7207:3d2b0b02bd3d.
[1] https://jakearchibald.com/2017/h2-push-tougher-than-i-thought/
[2] https://chromestatus.com/feature/6302414934114304
author | Sergey Kandaurov <pluknet@nginx.com> |
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date | Thu, 08 Jun 2023 16:56:46 +0400 |
parents | 08ef02ad5c54 |
children | cdda286c0f1b |
rev | line source |
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1 /* |
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2 * Copyright (C) Nginx, Inc. |
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3 * Copyright (C) Valentin V. Bartenev |
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4 */ |
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5 |
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6 |
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7 #ifndef _NGX_HTTP_V2_H_INCLUDED_ |
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8 #define _NGX_HTTP_V2_H_INCLUDED_ |
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9 |
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10 |
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11 #include <ngx_config.h> |
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12 #include <ngx_core.h> |
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13 #include <ngx_http.h> |
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14 |
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15 |
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16 #define NGX_HTTP_V2_ALPN_PROTO "\x02h2" |
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17 |
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18 #define NGX_HTTP_V2_STATE_BUFFER_SIZE 16 |
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20 #define NGX_HTTP_V2_DEFAULT_FRAME_SIZE (1 << 14) |
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21 #define NGX_HTTP_V2_MAX_FRAME_SIZE ((1 << 24) - 1) |
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22 |
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23 #define NGX_HTTP_V2_INT_OCTETS 4 |
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24 #define NGX_HTTP_V2_MAX_FIELD \ |
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25 (127 + (1 << (NGX_HTTP_V2_INT_OCTETS - 1) * 7) - 1) |
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26 |
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27 #define NGX_HTTP_V2_FRAME_HEADER_SIZE 9 |
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28 |
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29 /* frame types */ |
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30 #define NGX_HTTP_V2_DATA_FRAME 0x0 |
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31 #define NGX_HTTP_V2_HEADERS_FRAME 0x1 |
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32 #define NGX_HTTP_V2_PRIORITY_FRAME 0x2 |
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33 #define NGX_HTTP_V2_RST_STREAM_FRAME 0x3 |
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34 #define NGX_HTTP_V2_SETTINGS_FRAME 0x4 |
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35 #define NGX_HTTP_V2_PUSH_PROMISE_FRAME 0x5 |
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36 #define NGX_HTTP_V2_PING_FRAME 0x6 |
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37 #define NGX_HTTP_V2_GOAWAY_FRAME 0x7 |
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38 #define NGX_HTTP_V2_WINDOW_UPDATE_FRAME 0x8 |
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39 #define NGX_HTTP_V2_CONTINUATION_FRAME 0x9 |
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40 |
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41 /* frame flags */ |
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42 #define NGX_HTTP_V2_NO_FLAG 0x00 |
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43 #define NGX_HTTP_V2_ACK_FLAG 0x01 |
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44 #define NGX_HTTP_V2_END_STREAM_FLAG 0x01 |
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45 #define NGX_HTTP_V2_END_HEADERS_FLAG 0x04 |
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46 #define NGX_HTTP_V2_PADDED_FLAG 0x08 |
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47 #define NGX_HTTP_V2_PRIORITY_FLAG 0x20 |
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48 |
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49 #define NGX_HTTP_V2_MAX_WINDOW ((1U << 31) - 1) |
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50 #define NGX_HTTP_V2_DEFAULT_WINDOW 65535 |
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51 |
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52 #define NGX_HTTP_V2_DEFAULT_WEIGHT 16 |
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53 |
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54 |
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55 typedef struct ngx_http_v2_connection_s ngx_http_v2_connection_t; |
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56 typedef struct ngx_http_v2_node_s ngx_http_v2_node_t; |
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57 typedef struct ngx_http_v2_out_frame_s ngx_http_v2_out_frame_t; |
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58 |
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59 |
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60 typedef u_char *(*ngx_http_v2_handler_pt) (ngx_http_v2_connection_t *h2c, |
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61 u_char *pos, u_char *end); |
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62 |
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63 |
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64 typedef struct { |
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65 ngx_flag_t enable; |
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66 size_t pool_size; |
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67 ngx_uint_t concurrent_streams; |
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68 size_t preread_size; |
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69 ngx_uint_t streams_index_mask; |
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70 } ngx_http_v2_srv_conf_t; |
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71 |
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72 |
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73 typedef struct { |
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74 ngx_str_t name; |
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75 ngx_str_t value; |
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76 } ngx_http_v2_header_t; |
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77 |
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78 |
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79 typedef struct { |
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80 ngx_uint_t sid; |
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81 size_t length; |
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82 size_t padding; |
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83 unsigned flags:8; |
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84 |
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85 unsigned incomplete:1; |
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86 unsigned keep_pool:1; |
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87 |
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88 /* HPACK */ |
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89 unsigned parse_name:1; |
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90 unsigned parse_value:1; |
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91 unsigned index:1; |
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92 ngx_http_v2_header_t header; |
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93 size_t header_limit; |
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94 u_char field_state; |
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95 u_char *field_start; |
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96 u_char *field_end; |
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97 size_t field_rest; |
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98 ngx_pool_t *pool; |
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99 |
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100 ngx_http_v2_stream_t *stream; |
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101 |
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102 u_char buffer[NGX_HTTP_V2_STATE_BUFFER_SIZE]; |
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103 size_t buffer_used; |
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104 ngx_http_v2_handler_pt handler; |
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105 } ngx_http_v2_state_t; |
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106 |
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107 |
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108 |
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109 typedef struct { |
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110 ngx_http_v2_header_t **entries; |
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111 |
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112 ngx_uint_t added; |
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113 ngx_uint_t deleted; |
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114 ngx_uint_t reused; |
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115 ngx_uint_t allocated; |
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116 |
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117 size_t size; |
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118 size_t free; |
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119 u_char *storage; |
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120 u_char *pos; |
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121 } ngx_http_v2_hpack_t; |
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122 |
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123 |
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124 struct ngx_http_v2_connection_s { |
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125 ngx_connection_t *connection; |
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126 ngx_http_connection_t *http_connection; |
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127 |
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128 off_t total_bytes; |
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129 off_t payload_bytes; |
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130 |
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131 ngx_uint_t processing; |
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133 ngx_uint_t idle; |
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134 ngx_uint_t priority_limit; |
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135 |
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136 size_t send_window; |
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137 size_t recv_window; |
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138 size_t init_window; |
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139 |
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140 size_t frame_size; |
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141 |
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142 ngx_queue_t waiting; |
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143 |
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144 ngx_http_v2_state_t state; |
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145 |
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146 ngx_http_v2_hpack_t hpack; |
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147 |
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148 ngx_pool_t *pool; |
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149 |
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150 ngx_http_v2_out_frame_t *free_frames; |
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151 ngx_connection_t *free_fake_connections; |
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152 |
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153 ngx_http_v2_node_t **streams_index; |
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154 |
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155 ngx_http_v2_out_frame_t *last_out; |
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156 |
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157 ngx_queue_t dependencies; |
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158 ngx_queue_t closed; |
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159 |
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160 ngx_uint_t closed_nodes; |
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161 ngx_uint_t last_sid; |
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162 |
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163 time_t lingering_time; |
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164 |
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165 unsigned settings_ack:1; |
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166 unsigned table_update:1; |
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167 unsigned blocked:1; |
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168 unsigned goaway:1; |
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169 }; |
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170 |
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171 |
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172 struct ngx_http_v2_node_s { |
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173 ngx_uint_t id; |
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174 ngx_http_v2_node_t *index; |
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175 ngx_http_v2_node_t *parent; |
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176 ngx_queue_t queue; |
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177 ngx_queue_t children; |
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178 ngx_queue_t reuse; |
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179 ngx_uint_t rank; |
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180 ngx_uint_t weight; |
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181 double rel_weight; |
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182 ngx_http_v2_stream_t *stream; |
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183 }; |
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184 |
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185 |
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186 struct ngx_http_v2_stream_s { |
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187 ngx_http_request_t *request; |
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188 ngx_http_v2_connection_t *connection; |
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189 ngx_http_v2_node_t *node; |
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190 |
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191 ngx_uint_t queued; |
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192 |
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193 /* |
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194 * A change to SETTINGS_INITIAL_WINDOW_SIZE could cause the |
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195 * send_window to become negative, hence it's signed. |
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196 */ |
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The HTTP/2 implementation (RFC 7240, 7241).
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197 ssize_t send_window; |
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198 size_t recv_window; |
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199 |
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200 ngx_buf_t *preread; |
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201 |
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202 ngx_uint_t frames; |
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203 |
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204 ngx_http_v2_out_frame_t *free_frames; |
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205 ngx_chain_t *free_frame_headers; |
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206 ngx_chain_t *free_bufs; |
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207 |
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208 ngx_queue_t queue; |
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209 |
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210 ngx_array_t *cookies; |
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211 |
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212 ngx_pool_t *pool; |
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213 |
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HTTP/2: fixed posted streams handling.
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214 unsigned waiting:1; |
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215 unsigned blocked:1; |
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|
216 unsigned exhausted:1; |
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217 unsigned in_closed:1; |
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218 unsigned out_closed:1; |
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HTTP/2: sending RST_STREAM with NO_ERROR to discard request body.
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219 unsigned rst_sent:1; |
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HTTP/2: rewritten handling of request body.
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220 unsigned no_flow_control:1; |
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HTTP/2: rewritten handling of request body.
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221 unsigned skip_data:1; |
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222 }; |
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223 |
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224 |
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225 struct ngx_http_v2_out_frame_s { |
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226 ngx_http_v2_out_frame_t *next; |
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227 ngx_chain_t *first; |
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228 ngx_chain_t *last; |
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229 ngx_int_t (*handler)(ngx_http_v2_connection_t *h2c, |
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230 ngx_http_v2_out_frame_t *frame); |
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231 |
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232 ngx_http_v2_stream_t *stream; |
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233 size_t length; |
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234 |
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235 unsigned blocked:1; |
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236 unsigned fin:1; |
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237 }; |
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238 |
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239 |
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240 static ngx_inline void |
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241 ngx_http_v2_queue_frame(ngx_http_v2_connection_t *h2c, |
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242 ngx_http_v2_out_frame_t *frame) |
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243 { |
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244 ngx_http_v2_out_frame_t **out; |
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245 |
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246 for (out = &h2c->last_out; *out; out = &(*out)->next) { |
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247 |
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248 if ((*out)->blocked || (*out)->stream == NULL) { |
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249 break; |
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250 } |
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251 |
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252 if ((*out)->stream->node->rank < frame->stream->node->rank |
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253 || ((*out)->stream->node->rank == frame->stream->node->rank |
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254 && (*out)->stream->node->rel_weight |
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255 >= frame->stream->node->rel_weight)) |
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256 { |
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257 break; |
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258 } |
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259 } |
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260 |
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261 frame->next = *out; |
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262 *out = frame; |
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263 } |
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264 |
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265 |
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266 static ngx_inline void |
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267 ngx_http_v2_queue_blocked_frame(ngx_http_v2_connection_t *h2c, |
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268 ngx_http_v2_out_frame_t *frame) |
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269 { |
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270 ngx_http_v2_out_frame_t **out; |
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271 |
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HTTP/2: style and typos.
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272 for (out = &h2c->last_out; *out; out = &(*out)->next) { |
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273 |
6246
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274 if ((*out)->blocked || (*out)->stream == NULL) { |
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275 break; |
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276 } |
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277 } |
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278 |
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279 frame->next = *out; |
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280 *out = frame; |
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281 } |
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282 |
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283 |
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284 static ngx_inline void |
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285 ngx_http_v2_queue_ordered_frame(ngx_http_v2_connection_t *h2c, |
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286 ngx_http_v2_out_frame_t *frame) |
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287 { |
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288 frame->next = h2c->last_out; |
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289 h2c->last_out = frame; |
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290 } |
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291 |
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292 |
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293 void ngx_http_v2_init(ngx_event_t *rev); |
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294 |
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295 ngx_int_t ngx_http_v2_read_request_body(ngx_http_request_t *r); |
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296 ngx_int_t ngx_http_v2_read_unbuffered_request_body(ngx_http_request_t *r); |
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297 |
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298 void ngx_http_v2_close_stream(ngx_http_v2_stream_t *stream, ngx_int_t rc); |
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299 |
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300 ngx_int_t ngx_http_v2_send_output_queue(ngx_http_v2_connection_t *h2c); |
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301 |
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302 |
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303 ngx_str_t *ngx_http_v2_get_static_name(ngx_uint_t index); |
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304 ngx_str_t *ngx_http_v2_get_static_value(ngx_uint_t index); |
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305 |
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306 ngx_int_t ngx_http_v2_get_indexed_header(ngx_http_v2_connection_t *h2c, |
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307 ngx_uint_t index, ngx_uint_t name_only); |
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308 ngx_int_t ngx_http_v2_add_header(ngx_http_v2_connection_t *h2c, |
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309 ngx_http_v2_header_t *header); |
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310 ngx_int_t ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size); |
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311 |
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312 |
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313 #define ngx_http_v2_prefix(bits) ((1 << (bits)) - 1) |
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314 |
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|
315 |
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|
316 #if (NGX_HAVE_NONALIGNED) |
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317 |
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318 #define ngx_http_v2_parse_uint16(p) ntohs(*(uint16_t *) (p)) |
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319 #define ngx_http_v2_parse_uint32(p) ntohl(*(uint32_t *) (p)) |
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320 |
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|
321 #else |
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|
322 |
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|
323 #define ngx_http_v2_parse_uint16(p) ((p)[0] << 8 | (p)[1]) |
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324 #define ngx_http_v2_parse_uint32(p) \ |
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325 ((uint32_t) (p)[0] << 24 | (p)[1] << 16 | (p)[2] << 8 | (p)[3]) |
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326 |
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|
327 #endif |
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|
328 |
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329 #define ngx_http_v2_parse_length(p) ((p) >> 8) |
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|
330 #define ngx_http_v2_parse_type(p) ((p) & 0xff) |
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|
331 #define ngx_http_v2_parse_sid(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff) |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
332 #define ngx_http_v2_parse_window(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff) |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
333 |
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|
334 |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
335 #define ngx_http_v2_write_uint16_aligned(p, s) \ |
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336 (*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t)) |
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337 #define ngx_http_v2_write_uint32_aligned(p, s) \ |
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|
338 (*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t)) |
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339 |
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|
340 #if (NGX_HAVE_NONALIGNED) |
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341 |
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342 #define ngx_http_v2_write_uint16 ngx_http_v2_write_uint16_aligned |
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343 #define ngx_http_v2_write_uint32 ngx_http_v2_write_uint32_aligned |
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344 |
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|
345 #else |
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The HTTP/2 implementation (RFC 7240, 7241).
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346 |
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347 #define ngx_http_v2_write_uint16(p, s) \ |
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348 ((p)[0] = (u_char) ((s) >> 8), \ |
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349 (p)[1] = (u_char) (s), \ |
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350 (p) + sizeof(uint16_t)) |
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351 |
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352 #define ngx_http_v2_write_uint32(p, s) \ |
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353 ((p)[0] = (u_char) ((s) >> 24), \ |
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354 (p)[1] = (u_char) ((s) >> 16), \ |
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355 (p)[2] = (u_char) ((s) >> 8), \ |
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356 (p)[3] = (u_char) (s), \ |
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357 (p) + sizeof(uint32_t)) |
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358 |
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359 #endif |
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360 |
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361 #define ngx_http_v2_write_len_and_type(p, l, t) \ |
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362 ngx_http_v2_write_uint32_aligned(p, (l) << 8 | (t)) |
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363 |
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364 #define ngx_http_v2_write_sid ngx_http_v2_write_uint32 |
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365 |
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366 |
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367 #define ngx_http_v2_indexed(i) (128 + (i)) |
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368 #define ngx_http_v2_inc_indexed(i) (64 + (i)) |
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369 |
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370 #define ngx_http_v2_write_name(dst, src, len, tmp) \ |
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371 ngx_http_v2_string_encode(dst, src, len, tmp, 1) |
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372 #define ngx_http_v2_write_value(dst, src, len, tmp) \ |
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373 ngx_http_v2_string_encode(dst, src, len, tmp, 0) |
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374 |
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375 #define NGX_HTTP_V2_ENCODE_RAW 0 |
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376 #define NGX_HTTP_V2_ENCODE_HUFF 0x80 |
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377 |
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378 #define NGX_HTTP_V2_AUTHORITY_INDEX 1 |
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379 |
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380 #define NGX_HTTP_V2_METHOD_INDEX 2 |
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381 #define NGX_HTTP_V2_METHOD_GET_INDEX 2 |
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382 #define NGX_HTTP_V2_METHOD_POST_INDEX 3 |
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383 |
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384 #define NGX_HTTP_V2_PATH_INDEX 4 |
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385 #define NGX_HTTP_V2_PATH_ROOT_INDEX 4 |
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386 |
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387 #define NGX_HTTP_V2_SCHEME_HTTP_INDEX 6 |
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388 #define NGX_HTTP_V2_SCHEME_HTTPS_INDEX 7 |
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389 |
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390 #define NGX_HTTP_V2_STATUS_INDEX 8 |
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391 #define NGX_HTTP_V2_STATUS_200_INDEX 8 |
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392 #define NGX_HTTP_V2_STATUS_204_INDEX 9 |
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393 #define NGX_HTTP_V2_STATUS_206_INDEX 10 |
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394 #define NGX_HTTP_V2_STATUS_304_INDEX 11 |
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395 #define NGX_HTTP_V2_STATUS_400_INDEX 12 |
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396 #define NGX_HTTP_V2_STATUS_404_INDEX 13 |
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397 #define NGX_HTTP_V2_STATUS_500_INDEX 14 |
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398 |
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399 #define NGX_HTTP_V2_CONTENT_LENGTH_INDEX 28 |
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400 #define NGX_HTTP_V2_CONTENT_TYPE_INDEX 31 |
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401 #define NGX_HTTP_V2_DATE_INDEX 33 |
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402 #define NGX_HTTP_V2_LAST_MODIFIED_INDEX 44 |
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403 #define NGX_HTTP_V2_LOCATION_INDEX 46 |
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404 #define NGX_HTTP_V2_SERVER_INDEX 54 |
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405 #define NGX_HTTP_V2_VARY_INDEX 59 |
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406 |
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407 #define NGX_HTTP_V2_PREFACE_START "PRI * HTTP/2.0\r\n" |
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408 #define NGX_HTTP_V2_PREFACE_END "\r\nSM\r\n\r\n" |
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409 #define NGX_HTTP_V2_PREFACE NGX_HTTP_V2_PREFACE_START \ |
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410 NGX_HTTP_V2_PREFACE_END |
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411 |
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412 |
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413 u_char *ngx_http_v2_string_encode(u_char *dst, u_char *src, size_t len, |
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414 u_char *tmp, ngx_uint_t lower); |
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415 |
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416 |
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417 extern ngx_module_t ngx_http_v2_module; |
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418 |
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419 |
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420 #endif /* _NGX_HTTP_V2_H_INCLUDED_ */ |