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Updated HTTP and stream objects in Russian njs reference.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 27 Nov 2018 19:04:53 +0300
parents 65c6c1ee3c78
children 3a8d96efece6
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd">
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8
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9 <article name="Справочник"
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10 link="/ru/docs/njs/reference.html"
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11 lang="ru"
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12 rev="1">
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13
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14 <section id="summary">
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15
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16 <para>
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17 <link doc="index.xml">njs</link> предоставляет объекты, методы и свойства
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18 для расширения функциональности nginx.
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19 </para>
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20
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21 </section>
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22
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23
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24 <section id="http_stream" name="Объекты nginx">
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25
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26
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27 <section id="http" name="HTTP-запрос">
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28
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29 <para>
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30 Объект <literal>HTTP</literal> доступен только в
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31 модуле <link doc="../http/ngx_http_js_module.xml">ngx_http_js_module</link>.
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32 Все строки в объекте <literal>HTTP</literal> являются
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33 <link id="string">байтовыми строками</link>.
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34
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35 <list type="tag">
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36
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37 <tag-name><literal>r.args{}</literal></tag-name>
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38 <tag-desc>
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39 объект аргументов запроса, только чтение
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40 </tag-desc>
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42 <tag-name><literal>r.error(<value>строка</value>)</literal></tag-name>
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43 <tag-desc>
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44 записывает <literal>строку</literal> в лог-файл ошибок
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45 на уровне лога <literal>error</literal>
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46 </tag-desc>
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48 <tag-name><literal>r.finish()</literal></tag-name>
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49 <tag-desc>
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50 завершает отправку ответа клиенту
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51 </tag-desc>
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52
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53 <tag-name><literal>r.headersIn{}</literal></tag-name>
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54 <tag-desc>
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55 объект входящих заголовков, только чтение.
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56 <para>
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57 Например, доступ к заголовку <literal>Foo</literal>
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58 можно получить при помощи синтаксиса <literal>headersIn.foo</literal>
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59 или <literal>headersIn['Foo']</literal>
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60 </para>
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61 </tag-desc>
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62
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63 <tag-name><literal>r.headersOut{}</literal></tag-name>
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64 <tag-desc>
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65 объект исходящих заголовков, доступно для записи.
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66 <para>
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67 Например, доступ к заголовку <literal>Foo</literal>
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68 можно получить при помощи синтаксиса <literal>headersOut.foo</literal>
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69 или <literal>headersOut['Foo']</literal>
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70 </para>
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71 </tag-desc>
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72
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73 <tag-name><literal>r.httpVersion</literal></tag-name>
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74 <tag-desc>
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75 версия HTTP, только чтение
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76 </tag-desc>
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77
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78 <tag-name><literal>r.log(<value>строка</value>)</literal></tag-name>
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79 <tag-desc>
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80 записывает <literal>строку</literal> в лог-файл ошибок
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81 на уровне лога <literal>info</literal>
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82 </tag-desc>
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83
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84 <tag-name id="r_internal_redirect"><literal>r.internalRedirect(<value>uri</value>)</literal></tag-name>
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85 <tag-desc>
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86 осуществляет внутреннее перенаправление на указанный <literal>uri</literal>.
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87 Если uri начинается с префикса “<literal>@</literal>”,
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88 то он считается именованным location.
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89 </tag-desc>
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90
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91 <tag-name><literal>r.method</literal></tag-name>
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92 <tag-desc>
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93 HTTP метод, только чтение
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94 </tag-desc>
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95
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96 <tag-name><literal>r.parent</literal></tag-name>
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97 <tag-desc>
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98 ссылается на родительский объект запроса
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99 </tag-desc>
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100
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101 <tag-name><literal>r.remoteAddress</literal></tag-name>
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102 <tag-desc>
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103 адрес клиента, только чтение
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104 </tag-desc>
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105
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106 <tag-name id="r_request_body"><literal>r.requestBody</literal></tag-name>
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107 <tag-desc>
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108 возвращает тело запроса клиента, если оно не было
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109 записано во временный файл.
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110 Чтобы убедиться, что тело запроса клиента находится в памяти,
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111 его размер должен быть ограничен
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112 <link doc="../http/ngx_http_core_module.xml" id="client_max_body_size"/>,
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113 и также необходимо установить достаточный размер буфера при помощи
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114 <link doc="../http/ngx_http_core_module.xml" id="client_body_buffer_size"/>.
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115 </tag-desc>
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116
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117 <tag-name><literal>r.responseBody</literal></tag-name>
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118 <tag-desc>
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119 хранит тело ответа <link id="subrequest">подзапроса</link>, только чтение.
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120 Размер <literal>r.responseBody</literal> ограничивается директивой
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121 <link doc="../http/ngx_http_core_module.xml" id="subrequest_output_buffer_size"/>.
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122 </tag-desc>
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123
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124 <tag-name><literal>r.return(код[, строка])</literal></tag-name>
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125 <tag-desc>
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126 отправляет
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127 клиенту полный ответ с указанным <literal>кодом</literal>
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128 <para>
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129 Можно задать или URL перенаправления
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130 (для кодов 301, 302, 303, 307 и 308),
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131 или текст тела ответа (для остальных кодов) в качестве второго аргумента
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132 </para>
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133 </tag-desc>
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134
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135 <tag-name><literal>r.send(<value>строка</value>)</literal></tag-name>
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136 <tag-desc>
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137 отправляет часть тела ответа клиенту
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138 </tag-desc>
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139
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140 <tag-name><literal>r.sendHeader()</literal></tag-name>
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141 <tag-desc>
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142 отправляет заголовки HTTP клиенту
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143 </tag-desc>
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144
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145 <tag-name><literal>r.status</literal></tag-name>
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146 <tag-desc>
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147 статус, доступно для записи
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148 </tag-desc>
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149
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150 <tag-name><literal>r.variables{}</literal></tag-name>
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151 <tag-desc>
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152 объект переменных nginx, только чтение
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153 </tag-desc>
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154
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155 <tag-name><literal>r.warn(<value>строка</value>)</literal></tag-name>
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156 <tag-desc>
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157 записывает <literal>строку</literal> в лог-файл ошибок
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158 на уровне лога <literal>warning</literal>
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159 </tag-desc>
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160
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161 <tag-name><literal>r.uri</literal></tag-name>
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162 <tag-desc>
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163 текущий URI, только чтение
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164 </tag-desc>
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165
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166 <tag-name id="subrequest"><literal>r.subrequest(<value>uri</value>[,
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167 <value>options</value>[, <value>callback</value>]])</literal></tag-name>
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168 <tag-desc>
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169 создаёт подзапрос с заданными <literal>uri</literal> и
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170 <literal>options</literal> и устанавливает
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171 необязательный <literal>callback</literal> завершения.
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172
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173 <para>
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174 Если <literal>options</literal> является строкой, то в ней
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175 содержится срока аргументов подзапроса.
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176 В противном случае ожидается, что <literal>options</literal> является
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177 объектом со следующими ключами:
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178 <list type="tag">
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179 <tag-name><literal>args</literal></tag-name>
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180 <tag-desc>
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181 строка с аргументами
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182 </tag-desc>
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183 <tag-name><literal>body</literal></tag-name>
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184 <tag-desc>
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185 тело запроса
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186 </tag-desc>
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187
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188 <tag-name><literal>method</literal></tag-name>
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189 <tag-desc>
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190 метод HTTP
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191 </tag-desc>
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192
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193 </list>
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194 </para>
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195
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196 <para>
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197 <literal>callback</literal> получает
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198 объект ответа подзапроса с методами и свойствами,
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199 идентичными родительскому объекту запроса.
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200 </para>
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201 </tag-desc>
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202
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203 </list>
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204 </para>
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205
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206 </section>
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207
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208
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209 <section id="stream" name="Stream-сессия">
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210
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211 <para>
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212 Объект stream-сессии доступен только в
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213 модуле
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214 <link doc="../stream/ngx_stream_js_module.xml">ngx_stream_js_module</link>.
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215 Все строки в объекте <literal>stream</literal> являются
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216 <link id="string">байтовыми строками</link>.
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217 </para>
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218
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219 <para>
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220 <note>
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221 До версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>,
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222 у объекта stream-сессии были некоторые свойства, которые на данный момент
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223 <link id="stream_obsolete">удалены</link>.
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224 </note>
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225 </para>
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226
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227 <para>
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228 <list type="tag">
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229
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230 <tag-name id="s_allow"><literal>s.allow()</literal></tag-name>
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231 <tag-desc>
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232 успешно финализирует обработчик фазы
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233 (<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>)
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234 </tag-desc>
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235
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236 <tag-name id="s_decline"><literal>s.decline()</literal></tag-name>
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237 <tag-desc>
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238 финализирует обработчик фазы и передаёт контроль следующему обработчику
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239 (<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>)
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240 </tag-desc>
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241
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242 <tag-name id="s_deny"><literal>s.deny()</literal></tag-name>
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243 <tag-desc>
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244 финализирует обработчик фазы с кодом ошибки доступа
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245 (<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>)
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246 </tag-desc>
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247
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248 <tag-name id="s_done"><literal>s.done</literal>(<value>[код]</value>)</tag-name>
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249 <tag-desc>
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250 успешно финализирует текущий обработчик фазы
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251 или финализирует его с указанным числовым кодом
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252 (<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>).
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253 </tag-desc>
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254
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255 <tag-name><literal>s.error(<value>строка</value>)</literal></tag-name>
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256 <tag-desc>
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257 записывает отправленную <literal>строку</literal> в лог-файл ошибок
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258 на уровне лога <literal>error</literal>
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259 </tag-desc>
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260
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261 <tag-name><literal>s.log(<value>строка</value>)</literal></tag-name>
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262 <tag-desc>
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263 записывает отправленную <value>строку</value> в лог-файл ошибок
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264 на уровне лога <literal>info</literal>
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265 </tag-desc>
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266
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267 <tag-name id="s_off"><literal>s.off(<value>имяСобытия</value>)</literal></tag-name>
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268 <tag-desc>
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269 отменяет регистрацию callback'а, установленного методом
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270 <link id="s_on">s.on()</link>
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271 (<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>)
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272 </tag-desc>
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273
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274 <tag-name id="s_on"><literal>s.on(<value>событие</value>,
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275 <value>callback</value>)</literal></tag-name>
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276 <tag-desc>
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277 регистрирует <literal>callback</literal> для указанного <literal>события</literal>
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278 (<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>).
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279
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280 <para>
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281 <literal>Событием</literal> может являться одна из следующих строк:
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282 <list type="tag">
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283 <tag-name><literal>upload</literal></tag-name>
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284 <tag-desc>
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285 новые данные от клиента
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286 </tag-desc>
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287
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288 <tag-name><literal>download</literal></tag-name>
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289 <tag-desc>
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290 новые данные к клиенту
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291 </tag-desc>
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292
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293 </list>
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294 </para>
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295
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296 <para>
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297 Callback завершения имеет следующий прототип:
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298 <literal>callback(данные, флаги)</literal>, где
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299 <literal>данные</literal> являются строкой,
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300 <literal>флаги</literal> являются объектом
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301 со следующими свойствами:
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302 <list type="tag">
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303 <tag-name id="s_on_callback_last"><literal>last</literal></tag-name>
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304 <tag-desc>
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305 логическое свойство,
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306 true, если данные являются последним буфером.
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307 </tag-desc>
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308
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309 </list>
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310 </para>
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311 </tag-desc>
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312
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313 <tag-name><literal>s.remoteAddress</literal></tag-name>
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314 <tag-desc>
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315 адрес клиента, только чтение
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316 </tag-desc>
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317
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318 <tag-name id="s_send"><literal>s.send(<value>данные</value>[,
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319 <value>параметры</value>])</literal></tag-name>
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320 <tag-desc>
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321 отправляет данные клиенту
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322 (<link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>).
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323 <literal>Параметры</literal> являются объектом, используемым
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324 для переопределения флагов буфера nginx,
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325 полученных из буфера входных данных.
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326 Флаги могут быть переопределены при помощи следующих флагов:
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327 <para>
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328 <list type="tag">
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329
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330 <tag-name><literal>last</literal></tag-name>
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331 <tag-desc>
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332 логическое свойство,
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333 true, если буфер является последним буфером
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334 </tag-desc>
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335
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336 <tag-name><literal>flush</literal></tag-name>
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337 <tag-desc>
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338 логическое свойство,
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339 true, если буфер должен иметь флаг <literal>flush</literal>
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340 </tag-desc>
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341 </list>
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342 </para>
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343 Метод может быть вызван несколько раз в течение одного вызова callback'a.
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344 </tag-desc>
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345
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346 <tag-name><literal>s.variables{}</literal></tag-name>
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347 <tag-desc>
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348 объект переменных nginx, только чтение
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349 </tag-desc>
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350
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351 <tag-name><literal>s.warn(<value>строка</value>)</literal></tag-name>
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352 <tag-desc>
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353 записывает отправленную <literal>строку</literal> в лог-файл ошибок
2182
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354 на уровне лога <literal>warning</literal>
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355 </tag-desc>
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356
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357 </list>
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358 </para>
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359
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360 <section id="stream_obsolete" name="Устаревшие свойства">
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361
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362 <para>
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363 Данные свойства были удалены
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364 в njs версии <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
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365 и не имеют обратной совместимости с существующим кодом njs.
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366 </para>
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367
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368 <para>
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369 <list type="tag">
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370
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371 <tag-name id="s_abort"><literal>s.ABORT</literal></tag-name>
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372 <tag-desc>
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373 код <literal>ABORT</literal>
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374 <note>
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375 Начиная с версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
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376 необходимо использовать метод <link id="s_deny">s.deny()</link>.
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377 </note>
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378 </tag-desc>
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379
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380 <tag-name><literal>s.AGAIN</literal></tag-name>
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381 <tag-desc>
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382 код <literal>AGAIN</literal>
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383 <note>
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384 Начиная с версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
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385 соответствующее поведение достигается, если не вызываются
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386 <link id="s_allow">s.allow()</link>,
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387 <link id="s_deny">s.deny()</link>,
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388 <link id="s_decline">s.decline()</link>,
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389 <link id="s_done">s.done()</link>
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390 и callback зарегистрирован.
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391 </note>
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392 </tag-desc>
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393
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394 <tag-name id="s_buffer"><literal>s.buffer</literal></tag-name>
2175
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395 <tag-desc>
2295
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396 текущий буфер, доступен для записи
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397 <note>
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398 Начиная с версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
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399 для записи необходимо использовать метод <link id="s_send">s.send()</link>.
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400 Для чтения текущий буфер доступен в качестве первого аргумента
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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401 callback'а <literal>event</literal>.
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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402 </note>
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403 </tag-desc>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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404
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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405 <tag-name><literal>s.DECLINED</literal></tag-name>
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406 <tag-desc>
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Yaroslav Zhuravlev <yar@nginx.com>
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407 код <literal>DECLINED</literal>
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408 <note>
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409 Начиная с версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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diff changeset
410 необходимо использовать метод <link id="s_decline">s.decline()</link>.
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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411 </note>
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Yaroslav Zhuravlev <yar@nginx.com>
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412 </tag-desc>
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Yaroslav Zhuravlev <yar@nginx.com>
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413
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414 <tag-name><literal>s.eof</literal></tag-name>
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parents: 2290
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415 <tag-desc>
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Yaroslav Zhuravlev <yar@nginx.com>
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416 логическое свойство,
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
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417 true, если текущий буфер является последним буфером,
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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418 только чтение
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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419 <note>
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420 Начиная с версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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421 необходимо использовать свойство <link id="s_on_callback_last">flags.last</link>.
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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diff changeset
422 </note>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
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diff changeset
423 </tag-desc>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
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diff changeset
424
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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diff changeset
425 <tag-name><literal>s.ERROR</literal></tag-name>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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diff changeset
426 <tag-desc>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
427 код <literal>ERROR</literal>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
428 <note>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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diff changeset
429 Начиная с версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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parents: 2290
diff changeset
430 для сообщения об ошибке используется соответствующее исключение.
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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parents: 2290
diff changeset
431 </note>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
432 </tag-desc>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
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diff changeset
433
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diff changeset
434 <tag-name><literal>s.fromUpstream</literal></tag-name>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
435 <tag-desc>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
436 логическое свойство,
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
437 true, если текущий буфер является буфером от проксируемого сервера к клиенту,
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
438 только чтение
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
439 <note>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
440 Начиная с версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
441 необходимо использовать
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
442 соответствующее <link id="s_on">событие</link>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
443 (<literal>upload</literal> или <literal>download</literal>)
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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parents: 2290
diff changeset
444 для обработки данных к клиенту или от клиента.
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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diff changeset
445 </note>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
446 </tag-desc>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
447
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
448 <tag-name id="s_ok"><literal>s.OK</literal></tag-name>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
449 <tag-desc>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
450 код <literal>OK</literal>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
451 <note>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
452 Начиная с версии njs <link doc="../njs/changes.xml" id="njs0.2.4">0.2.4</link>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 2290
diff changeset
453 необходимо использовать метод <link id="s_allow">s.allow()</link>.
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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parents: 2290
diff changeset
454 </note>
2175
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parents:
diff changeset
455 </tag-desc>
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff changeset
456
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff changeset
457 </list>
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff changeset
458 </para>
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff changeset
459
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff changeset
460 </section>
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff changeset
461
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff changeset
462 </section>
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
diff changeset
463
2295
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diff changeset
464 </section>
a1d0238ffb61 Updated HTTP and stream objects in Russian njs reference.
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465
2175
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diff changeset
466 </article>
cd4889fdcfa4 Moved njs HTTP and Stream API to a separate page.
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parents:
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467