Mercurial > hg > nginx
annotate src/http/v2/ngx_http_v2.h @ 7100:12cadc4669a7
HTTP/2: signal 0-byte HPACK's dynamic table size.
This change lets NGINX talk to clients with SETTINGS_HEADER_TABLE_SIZE
smaller than the default 4KB. Previously, NGINX would ACK the SETTINGS
frame with a small dynamic table size, but it would never send dynamic
table size update, leading to a connection-level COMPRESSION_ERROR.
Also, it allows clients to release 4KB of memory per connection, since
NGINX doesn't use HPACK's dynamic table when encoding headers, however
clients had to maintain it, since NGINX never signaled that it doesn't
use it.
Signed-off-by: Piotr Sikora <piotrsikora@google.com>
author | Piotr Sikora <piotrsikora@google.com> |
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date | Wed, 30 Aug 2017 14:52:11 -0700 |
parents | 7206c3630310 |
children | 61d276dcd493 |
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_ADVERTISE "\x02h2" |
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17 #define NGX_HTTP_V2_NPN_ADVERTISE NGX_HTTP_V2_ALPN_ADVERTISE |
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18 |
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19 #define NGX_HTTP_V2_STATE_BUFFER_SIZE 16 |
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20 |
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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 |
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53 typedef struct ngx_http_v2_connection_s ngx_http_v2_connection_t; |
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54 typedef struct ngx_http_v2_node_s ngx_http_v2_node_t; |
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55 typedef struct ngx_http_v2_out_frame_s ngx_http_v2_out_frame_t; |
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56 |
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57 |
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58 typedef u_char *(*ngx_http_v2_handler_pt) (ngx_http_v2_connection_t *h2c, |
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59 u_char *pos, u_char *end); |
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60 |
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61 |
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62 typedef struct { |
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63 ngx_str_t name; |
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64 ngx_str_t value; |
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65 } ngx_http_v2_header_t; |
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66 |
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67 |
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68 typedef struct { |
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69 ngx_uint_t sid; |
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70 size_t length; |
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71 size_t padding; |
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72 unsigned flags:8; |
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73 |
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74 unsigned incomplete:1; |
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75 unsigned keep_pool:1; |
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76 |
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77 /* HPACK */ |
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78 unsigned parse_name:1; |
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79 unsigned parse_value:1; |
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80 unsigned index:1; |
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81 ngx_http_v2_header_t header; |
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82 size_t header_limit; |
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83 u_char field_state; |
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84 u_char *field_start; |
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85 u_char *field_end; |
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86 size_t field_rest; |
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87 ngx_pool_t *pool; |
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88 |
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89 ngx_http_v2_stream_t *stream; |
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90 |
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91 u_char buffer[NGX_HTTP_V2_STATE_BUFFER_SIZE]; |
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92 size_t buffer_used; |
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93 ngx_http_v2_handler_pt handler; |
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94 } ngx_http_v2_state_t; |
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95 |
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96 |
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97 |
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98 typedef struct { |
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99 ngx_http_v2_header_t **entries; |
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100 |
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101 ngx_uint_t added; |
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102 ngx_uint_t deleted; |
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103 ngx_uint_t reused; |
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104 ngx_uint_t allocated; |
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105 |
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106 size_t size; |
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107 size_t free; |
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108 u_char *storage; |
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109 u_char *pos; |
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110 } ngx_http_v2_hpack_t; |
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111 |
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112 |
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113 struct ngx_http_v2_connection_s { |
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114 ngx_connection_t *connection; |
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The HTTP/2 implementation (RFC 7240, 7241).
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115 ngx_http_connection_t *http_connection; |
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116 |
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117 ngx_uint_t processing; |
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118 |
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119 size_t send_window; |
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120 size_t recv_window; |
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121 size_t init_window; |
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122 |
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123 size_t frame_size; |
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124 |
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125 ngx_queue_t waiting; |
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126 |
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127 ngx_http_v2_state_t state; |
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128 |
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129 ngx_http_v2_hpack_t hpack; |
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130 |
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131 ngx_pool_t *pool; |
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132 |
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133 ngx_http_v2_out_frame_t *free_frames; |
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134 ngx_connection_t *free_fake_connections; |
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135 |
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136 ngx_http_v2_node_t **streams_index; |
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137 |
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138 ngx_http_v2_out_frame_t *last_out; |
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139 |
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140 ngx_queue_t dependencies; |
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141 ngx_queue_t closed; |
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142 |
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143 ngx_uint_t last_sid; |
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144 |
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145 unsigned closed_nodes:8; |
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146 unsigned settings_ack:1; |
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147 unsigned table_update:1; |
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148 unsigned blocked:1; |
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HTTP/2: graceful shutdown of active connections (closes #1106).
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149 unsigned goaway:1; |
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150 }; |
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151 |
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152 |
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153 struct ngx_http_v2_node_s { |
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154 ngx_uint_t id; |
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155 ngx_http_v2_node_t *index; |
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156 ngx_http_v2_node_t *parent; |
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157 ngx_queue_t queue; |
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158 ngx_queue_t children; |
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159 ngx_queue_t reuse; |
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160 ngx_uint_t rank; |
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161 ngx_uint_t weight; |
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162 double rel_weight; |
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163 ngx_http_v2_stream_t *stream; |
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164 }; |
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165 |
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166 |
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167 struct ngx_http_v2_stream_s { |
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168 ngx_http_request_t *request; |
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169 ngx_http_v2_connection_t *connection; |
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170 ngx_http_v2_node_t *node; |
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171 |
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172 ngx_uint_t queued; |
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173 |
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174 /* |
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175 * A change to SETTINGS_INITIAL_WINDOW_SIZE could cause the |
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176 * send_window to become negative, hence it's signed. |
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177 */ |
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178 ssize_t send_window; |
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179 size_t recv_window; |
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180 |
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181 ngx_buf_t *preread; |
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182 |
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183 ngx_http_v2_out_frame_t *free_frames; |
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184 ngx_chain_t *free_frame_headers; |
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185 ngx_chain_t *free_bufs; |
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186 |
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187 ngx_queue_t queue; |
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188 |
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189 ngx_array_t *cookies; |
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190 |
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191 size_t header_limit; |
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192 |
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193 ngx_pool_t *pool; |
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194 |
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195 unsigned waiting:1; |
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196 unsigned blocked:1; |
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197 unsigned exhausted:1; |
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198 unsigned in_closed:1; |
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199 unsigned out_closed:1; |
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HTTP/2: sending RST_STREAM with NO_ERROR to discard request body.
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200 unsigned rst_sent:1; |
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201 unsigned no_flow_control:1; |
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HTTP/2: rewritten handling of request body.
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202 unsigned skip_data:1; |
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203 }; |
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204 |
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205 |
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206 struct ngx_http_v2_out_frame_s { |
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207 ngx_http_v2_out_frame_t *next; |
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208 ngx_chain_t *first; |
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209 ngx_chain_t *last; |
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210 ngx_int_t (*handler)(ngx_http_v2_connection_t *h2c, |
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211 ngx_http_v2_out_frame_t *frame); |
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212 |
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213 ngx_http_v2_stream_t *stream; |
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214 size_t length; |
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215 |
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216 unsigned blocked:1; |
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217 unsigned fin:1; |
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|
218 }; |
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219 |
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220 |
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221 static ngx_inline void |
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The HTTP/2 implementation (RFC 7240, 7241).
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222 ngx_http_v2_queue_frame(ngx_http_v2_connection_t *h2c, |
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223 ngx_http_v2_out_frame_t *frame) |
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224 { |
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225 ngx_http_v2_out_frame_t **out; |
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226 |
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227 for (out = &h2c->last_out; *out; out = &(*out)->next) { |
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228 |
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229 if ((*out)->blocked || (*out)->stream == NULL) { |
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|
230 break; |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
231 } |
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The HTTP/2 implementation (RFC 7240, 7241).
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232 |
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233 if ((*out)->stream->node->rank < frame->stream->node->rank |
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234 || ((*out)->stream->node->rank == frame->stream->node->rank |
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235 && (*out)->stream->node->rel_weight |
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236 >= frame->stream->node->rel_weight)) |
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237 { |
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238 break; |
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239 } |
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240 } |
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241 |
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242 frame->next = *out; |
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243 *out = frame; |
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244 } |
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245 |
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246 |
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247 static ngx_inline void |
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248 ngx_http_v2_queue_blocked_frame(ngx_http_v2_connection_t *h2c, |
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249 ngx_http_v2_out_frame_t *frame) |
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250 { |
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251 ngx_http_v2_out_frame_t **out; |
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252 |
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253 for (out = &h2c->last_out; *out; out = &(*out)->next) { |
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254 |
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255 if ((*out)->blocked || (*out)->stream == NULL) { |
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256 break; |
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257 } |
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258 } |
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259 |
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260 frame->next = *out; |
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261 *out = frame; |
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262 } |
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263 |
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264 |
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265 static ngx_inline void |
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266 ngx_http_v2_queue_ordered_frame(ngx_http_v2_connection_t *h2c, |
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267 ngx_http_v2_out_frame_t *frame) |
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268 { |
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269 frame->next = h2c->last_out; |
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270 h2c->last_out = frame; |
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271 } |
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272 |
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273 |
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274 void ngx_http_v2_init(ngx_event_t *rev); |
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275 void ngx_http_v2_request_headers_init(void); |
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276 |
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277 ngx_int_t ngx_http_v2_read_request_body(ngx_http_request_t *r); |
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278 ngx_int_t ngx_http_v2_read_unbuffered_request_body(ngx_http_request_t *r); |
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279 |
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280 void ngx_http_v2_close_stream(ngx_http_v2_stream_t *stream, ngx_int_t rc); |
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281 |
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282 ngx_int_t ngx_http_v2_send_output_queue(ngx_http_v2_connection_t *h2c); |
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283 |
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284 |
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285 ngx_int_t ngx_http_v2_get_indexed_header(ngx_http_v2_connection_t *h2c, |
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286 ngx_uint_t index, ngx_uint_t name_only); |
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287 ngx_int_t ngx_http_v2_add_header(ngx_http_v2_connection_t *h2c, |
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288 ngx_http_v2_header_t *header); |
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289 ngx_int_t ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size); |
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290 |
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291 |
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292 ngx_int_t ngx_http_v2_huff_decode(u_char *state, u_char *src, size_t len, |
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293 u_char **dst, ngx_uint_t last, ngx_log_t *log); |
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294 size_t ngx_http_v2_huff_encode(u_char *src, size_t len, u_char *dst, |
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295 ngx_uint_t lower); |
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296 |
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297 |
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298 #define ngx_http_v2_prefix(bits) ((1 << (bits)) - 1) |
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299 |
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300 |
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301 #if (NGX_HAVE_NONALIGNED) |
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302 |
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303 #define ngx_http_v2_parse_uint16(p) ntohs(*(uint16_t *) (p)) |
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304 #define ngx_http_v2_parse_uint32(p) ntohl(*(uint32_t *) (p)) |
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305 |
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|
306 #else |
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307 |
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308 #define ngx_http_v2_parse_uint16(p) ((p)[0] << 8 | (p)[1]) |
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309 #define ngx_http_v2_parse_uint32(p) \ |
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310 ((uint32_t) (p)[0] << 24 | (p)[1] << 16 | (p)[2] << 8 | (p)[3]) |
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311 |
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312 #endif |
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313 |
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314 #define ngx_http_v2_parse_length(p) ((p) >> 8) |
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315 #define ngx_http_v2_parse_type(p) ((p) & 0xff) |
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316 #define ngx_http_v2_parse_sid(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff) |
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317 #define ngx_http_v2_parse_window(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff) |
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318 |
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319 |
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320 #define ngx_http_v2_write_uint16_aligned(p, s) \ |
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321 (*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t)) |
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322 #define ngx_http_v2_write_uint32_aligned(p, s) \ |
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323 (*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t)) |
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324 |
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325 #if (NGX_HAVE_NONALIGNED) |
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326 |
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327 #define ngx_http_v2_write_uint16 ngx_http_v2_write_uint16_aligned |
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328 #define ngx_http_v2_write_uint32 ngx_http_v2_write_uint32_aligned |
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329 |
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330 #else |
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331 |
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332 #define ngx_http_v2_write_uint16(p, s) \ |
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333 ((p)[0] = (u_char) ((s) >> 8), \ |
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334 (p)[1] = (u_char) (s), \ |
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335 (p) + sizeof(uint16_t)) |
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336 |
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337 #define ngx_http_v2_write_uint32(p, s) \ |
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338 ((p)[0] = (u_char) ((s) >> 24), \ |
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339 (p)[1] = (u_char) ((s) >> 16), \ |
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340 (p)[2] = (u_char) ((s) >> 8), \ |
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341 (p)[3] = (u_char) (s), \ |
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342 (p) + sizeof(uint32_t)) |
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|
343 |
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344 #endif |
257b51c37c5a
The HTTP/2 implementation (RFC 7240, 7241).
Valentin Bartenev <vbart@nginx.com>
parents:
diff
changeset
|
345 |
257b51c37c5a
The HTTP/2 implementation (RFC 7240, 7241).
Valentin Bartenev <vbart@nginx.com>
parents:
diff
changeset
|
346 #define ngx_http_v2_write_len_and_type(p, l, t) \ |
257b51c37c5a
The HTTP/2 implementation (RFC 7240, 7241).
Valentin Bartenev <vbart@nginx.com>
parents:
diff
changeset
|
347 ngx_http_v2_write_uint32_aligned(p, (l) << 8 | (t)) |
257b51c37c5a
The HTTP/2 implementation (RFC 7240, 7241).
Valentin Bartenev <vbart@nginx.com>
parents:
diff
changeset
|
348 |
257b51c37c5a
The HTTP/2 implementation (RFC 7240, 7241).
Valentin Bartenev <vbart@nginx.com>
parents:
diff
changeset
|
349 #define ngx_http_v2_write_sid ngx_http_v2_write_uint32 |
257b51c37c5a
The HTTP/2 implementation (RFC 7240, 7241).
Valentin Bartenev <vbart@nginx.com>
parents:
diff
changeset
|
350 |
257b51c37c5a
The HTTP/2 implementation (RFC 7240, 7241).
Valentin Bartenev <vbart@nginx.com>
parents:
diff
changeset
|
351 #endif /* _NGX_HTTP_V2_H_INCLUDED_ */ |