Mercurial > hg > nginx
annotate src/http/v2/ngx_http_v2.h @ 6495:92464ebace8e
HTTP/2: sending RST_STREAM with NO_ERROR to discard request body.
RFC 7540 states that "A server can send a complete response prior to the client
sending an entire request if the response does not depend on any portion of the
request that has not been sent and received. When this is true, a server MAY
request that the client abort transmission of a request without error by sending
a RST_STREAM with an error code of NO_ERROR after sending a complete response
(i.e., a frame with the END_STREAM flag)."
This should prevent a client from blocking on the stream window, since it isn't
maintained for closed streams. Currently, quite big initial stream windows are
used, so such blocking is very unlikly, but that will be changed in the further
patches.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Fri, 01 Apr 2016 15:56:03 +0300 |
parents | 8ec349bb60b2 |
children | 887cca40ba6a |
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_DATA_DISCARD 1 |
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28 #define NGX_HTTP_V2_DATA_ERROR 2 |
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29 #define NGX_HTTP_V2_DATA_INTERNAL_ERROR 3 |
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30 |
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31 #define NGX_HTTP_V2_FRAME_HEADER_SIZE 9 |
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32 |
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33 /* frame types */ |
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34 #define NGX_HTTP_V2_DATA_FRAME 0x0 |
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35 #define NGX_HTTP_V2_HEADERS_FRAME 0x1 |
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36 #define NGX_HTTP_V2_PRIORITY_FRAME 0x2 |
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37 #define NGX_HTTP_V2_RST_STREAM_FRAME 0x3 |
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38 #define NGX_HTTP_V2_SETTINGS_FRAME 0x4 |
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39 #define NGX_HTTP_V2_PUSH_PROMISE_FRAME 0x5 |
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40 #define NGX_HTTP_V2_PING_FRAME 0x6 |
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41 #define NGX_HTTP_V2_GOAWAY_FRAME 0x7 |
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42 #define NGX_HTTP_V2_WINDOW_UPDATE_FRAME 0x8 |
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43 #define NGX_HTTP_V2_CONTINUATION_FRAME 0x9 |
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44 |
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45 /* frame flags */ |
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46 #define NGX_HTTP_V2_NO_FLAG 0x00 |
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47 #define NGX_HTTP_V2_ACK_FLAG 0x01 |
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48 #define NGX_HTTP_V2_END_STREAM_FLAG 0x01 |
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49 #define NGX_HTTP_V2_END_HEADERS_FLAG 0x04 |
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50 #define NGX_HTTP_V2_PADDED_FLAG 0x08 |
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51 #define NGX_HTTP_V2_PRIORITY_FLAG 0x20 |
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52 |
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53 |
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54 typedef struct ngx_http_v2_connection_s ngx_http_v2_connection_t; |
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55 typedef struct ngx_http_v2_node_s ngx_http_v2_node_t; |
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56 typedef struct ngx_http_v2_out_frame_s ngx_http_v2_out_frame_t; |
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57 |
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58 |
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59 typedef u_char *(*ngx_http_v2_handler_pt) (ngx_http_v2_connection_t *h2c, |
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60 u_char *pos, u_char *end); |
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61 |
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62 |
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63 typedef struct { |
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64 ngx_str_t name; |
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65 ngx_str_t value; |
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66 } ngx_http_v2_header_t; |
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67 |
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68 |
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69 typedef struct { |
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70 ngx_uint_t sid; |
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71 size_t length; |
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72 size_t padding; |
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73 unsigned flags:8; |
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74 |
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75 unsigned incomplete:1; |
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76 unsigned keep_pool:1; |
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77 |
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78 /* HPACK */ |
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79 unsigned parse_name:1; |
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80 unsigned parse_value:1; |
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81 unsigned index:1; |
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82 ngx_http_v2_header_t header; |
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83 size_t header_limit; |
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84 u_char field_state; |
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85 u_char *field_start; |
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86 u_char *field_end; |
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87 size_t field_rest; |
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88 ngx_pool_t *pool; |
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89 |
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90 ngx_http_v2_stream_t *stream; |
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91 |
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92 u_char buffer[NGX_HTTP_V2_STATE_BUFFER_SIZE]; |
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93 size_t buffer_used; |
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94 ngx_http_v2_handler_pt handler; |
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95 } ngx_http_v2_state_t; |
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96 |
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97 |
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98 |
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99 typedef struct { |
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100 ngx_http_v2_header_t **entries; |
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101 |
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102 ngx_uint_t added; |
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103 ngx_uint_t deleted; |
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104 ngx_uint_t reused; |
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105 ngx_uint_t allocated; |
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106 |
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107 size_t size; |
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108 size_t free; |
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109 u_char *storage; |
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110 u_char *pos; |
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111 } ngx_http_v2_hpack_t; |
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112 |
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113 |
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114 struct ngx_http_v2_connection_s { |
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115 ngx_connection_t *connection; |
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The HTTP/2 implementation (RFC 7240, 7241).
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116 ngx_http_connection_t *http_connection; |
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117 |
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118 ngx_uint_t processing; |
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119 |
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120 size_t send_window; |
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121 size_t recv_window; |
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122 size_t init_window; |
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123 |
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124 size_t frame_size; |
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125 |
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126 ngx_queue_t waiting; |
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127 |
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128 ngx_http_v2_state_t state; |
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129 |
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130 ngx_http_v2_hpack_t hpack; |
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131 |
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132 ngx_pool_t *pool; |
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133 |
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134 ngx_http_v2_out_frame_t *free_frames; |
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135 ngx_connection_t *free_fake_connections; |
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136 |
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137 ngx_http_v2_node_t **streams_index; |
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138 |
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139 ngx_http_v2_out_frame_t *last_out; |
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140 |
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141 ngx_queue_t posted; |
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142 ngx_queue_t dependencies; |
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143 ngx_queue_t closed; |
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144 |
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145 ngx_uint_t last_sid; |
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146 |
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147 unsigned closed_nodes:8; |
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148 unsigned blocked:1; |
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149 }; |
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150 |
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151 |
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152 struct ngx_http_v2_node_s { |
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153 ngx_uint_t id; |
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154 ngx_http_v2_node_t *index; |
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155 ngx_http_v2_node_t *parent; |
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156 ngx_queue_t queue; |
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157 ngx_queue_t children; |
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158 ngx_queue_t reuse; |
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159 ngx_uint_t rank; |
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160 ngx_uint_t weight; |
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161 double rel_weight; |
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162 ngx_http_v2_stream_t *stream; |
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163 }; |
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164 |
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165 |
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166 struct ngx_http_v2_stream_s { |
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167 ngx_http_request_t *request; |
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168 ngx_http_v2_connection_t *connection; |
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169 ngx_http_v2_node_t *node; |
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170 |
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171 ngx_uint_t queued; |
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172 |
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173 /* |
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174 * A change to SETTINGS_INITIAL_WINDOW_SIZE could cause the |
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175 * send_window to become negative, hence it's signed. |
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176 */ |
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177 ssize_t send_window; |
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178 size_t recv_window; |
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179 |
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180 ngx_http_v2_out_frame_t *free_frames; |
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181 ngx_chain_t *free_frame_headers; |
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182 ngx_chain_t *free_bufs; |
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183 |
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184 ngx_queue_t queue; |
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185 |
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186 ngx_array_t *cookies; |
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187 |
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188 size_t header_limit; |
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189 |
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190 ngx_pool_t *pool; |
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HTTP/2: always use temporary pool for processing headers.
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191 |
6246
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192 unsigned handled:1; |
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193 unsigned blocked:1; |
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194 unsigned exhausted:1; |
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195 unsigned in_closed:1; |
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196 unsigned out_closed:1; |
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HTTP/2: sending RST_STREAM with NO_ERROR to discard request body.
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197 unsigned rst_sent:1; |
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198 unsigned skip_data:2; |
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199 }; |
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200 |
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201 |
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|
202 struct ngx_http_v2_out_frame_s { |
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203 ngx_http_v2_out_frame_t *next; |
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204 ngx_chain_t *first; |
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205 ngx_chain_t *last; |
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206 ngx_int_t (*handler)(ngx_http_v2_connection_t *h2c, |
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207 ngx_http_v2_out_frame_t *frame); |
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208 |
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209 ngx_http_v2_stream_t *stream; |
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The HTTP/2 implementation (RFC 7240, 7241).
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210 size_t length; |
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|
211 |
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212 unsigned blocked:1; |
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|
213 unsigned fin:1; |
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|
214 }; |
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|
215 |
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|
216 |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
217 static ngx_inline void |
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The HTTP/2 implementation (RFC 7240, 7241).
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218 ngx_http_v2_queue_frame(ngx_http_v2_connection_t *h2c, |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
219 ngx_http_v2_out_frame_t *frame) |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
220 { |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
221 ngx_http_v2_out_frame_t **out; |
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|
222 |
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The HTTP/2 implementation (RFC 7240, 7241).
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223 for (out = &h2c->last_out; *out; out = &(*out)->next) { |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
224 |
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|
225 if ((*out)->blocked || (*out)->stream == NULL) { |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
226 break; |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
227 } |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
228 |
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229 if ((*out)->stream->node->rank < frame->stream->node->rank |
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The HTTP/2 implementation (RFC 7240, 7241).
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230 || ((*out)->stream->node->rank == frame->stream->node->rank |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
231 && (*out)->stream->node->rel_weight |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
232 >= frame->stream->node->rel_weight)) |
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The HTTP/2 implementation (RFC 7240, 7241).
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233 { |
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The HTTP/2 implementation (RFC 7240, 7241).
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|
234 break; |
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The HTTP/2 implementation (RFC 7240, 7241).
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parents:
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235 } |
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236 } |
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237 |
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238 frame->next = *out; |
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239 *out = frame; |
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240 } |
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241 |
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242 |
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243 static ngx_inline void |
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244 ngx_http_v2_queue_blocked_frame(ngx_http_v2_connection_t *h2c, |
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245 ngx_http_v2_out_frame_t *frame) |
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246 { |
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247 ngx_http_v2_out_frame_t **out; |
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248 |
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249 for (out = &h2c->last_out; *out; out = &(*out)->next) |
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250 { |
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251 if ((*out)->blocked || (*out)->stream == NULL) { |
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252 break; |
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253 } |
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254 } |
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255 |
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256 frame->next = *out; |
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257 *out = frame; |
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258 } |
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259 |
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260 |
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261 void ngx_http_v2_init(ngx_event_t *rev); |
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262 void ngx_http_v2_request_headers_init(void); |
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263 |
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264 ngx_int_t ngx_http_v2_read_request_body(ngx_http_request_t *r, |
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265 ngx_http_client_body_handler_pt post_handler); |
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266 |
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267 void ngx_http_v2_close_stream(ngx_http_v2_stream_t *stream, ngx_int_t rc); |
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268 |
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269 ngx_int_t ngx_http_v2_send_output_queue(ngx_http_v2_connection_t *h2c); |
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270 |
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271 |
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272 ngx_int_t ngx_http_v2_get_indexed_header(ngx_http_v2_connection_t *h2c, |
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273 ngx_uint_t index, ngx_uint_t name_only); |
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274 ngx_int_t ngx_http_v2_add_header(ngx_http_v2_connection_t *h2c, |
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275 ngx_http_v2_header_t *header); |
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276 ngx_int_t ngx_http_v2_table_size(ngx_http_v2_connection_t *h2c, size_t size); |
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277 |
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278 |
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279 ngx_int_t ngx_http_v2_huff_decode(u_char *state, u_char *src, size_t len, |
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280 u_char **dst, ngx_uint_t last, ngx_log_t *log); |
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281 size_t ngx_http_v2_huff_encode(u_char *src, size_t len, u_char *dst, |
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282 ngx_uint_t lower); |
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283 |
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284 |
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285 #define ngx_http_v2_prefix(bits) ((1 << (bits)) - 1) |
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286 |
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287 |
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288 #if (NGX_HAVE_NONALIGNED) |
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289 |
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290 #define ngx_http_v2_parse_uint16(p) ntohs(*(uint16_t *) (p)) |
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291 #define ngx_http_v2_parse_uint32(p) ntohl(*(uint32_t *) (p)) |
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292 |
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293 #else |
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294 |
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295 #define ngx_http_v2_parse_uint16(p) ((p)[0] << 8 | (p)[1]) |
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296 #define ngx_http_v2_parse_uint32(p) \ |
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297 ((p)[0] << 24 | (p)[1] << 16 | (p)[2] << 8 | (p)[3]) |
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298 |
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299 #endif |
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300 |
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301 #define ngx_http_v2_parse_length(p) ((p) >> 8) |
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302 #define ngx_http_v2_parse_type(p) ((p) & 0xff) |
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303 #define ngx_http_v2_parse_sid(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff) |
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304 #define ngx_http_v2_parse_window(p) (ngx_http_v2_parse_uint32(p) & 0x7fffffff) |
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305 |
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306 |
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307 #define ngx_http_v2_write_uint16_aligned(p, s) \ |
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308 (*(uint16_t *) (p) = htons((uint16_t) (s)), (p) + sizeof(uint16_t)) |
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309 #define ngx_http_v2_write_uint32_aligned(p, s) \ |
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310 (*(uint32_t *) (p) = htonl((uint32_t) (s)), (p) + sizeof(uint32_t)) |
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311 |
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312 #if (NGX_HAVE_NONALIGNED) |
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313 |
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314 #define ngx_http_v2_write_uint16 ngx_http_v2_write_uint16_aligned |
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315 #define ngx_http_v2_write_uint32 ngx_http_v2_write_uint32_aligned |
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316 |
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317 #else |
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318 |
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319 #define ngx_http_v2_write_uint16(p, s) \ |
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320 ((p)[0] = (u_char) ((s) >> 8), \ |
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321 (p)[1] = (u_char) (s), \ |
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322 (p) + sizeof(uint16_t)) |
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323 |
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324 #define ngx_http_v2_write_uint32(p, s) \ |
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325 ((p)[0] = (u_char) ((s) >> 24), \ |
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326 (p)[1] = (u_char) ((s) >> 16), \ |
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327 (p)[2] = (u_char) ((s) >> 8), \ |
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328 (p)[3] = (u_char) (s), \ |
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329 (p) + sizeof(uint32_t)) |
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330 |
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331 #endif |
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332 |
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333 #define ngx_http_v2_write_len_and_type(p, l, t) \ |
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334 ngx_http_v2_write_uint32_aligned(p, (l) << 8 | (t)) |
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335 |
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336 #define ngx_http_v2_write_sid ngx_http_v2_write_uint32 |
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337 |
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338 #endif /* _NGX_HTTP_V2_H_INCLUDED_ */ |