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annotate OrthancFramework/Sources/HttpServer/HttpOutput.h @ 4706:dbee8bd8ee1f

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 22 Jun 2021 09:13:03 +0200
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children 7053502fbf97
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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23 #pragma once
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24
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25 #include "../Enumerations.h"
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26 #include "IHttpOutputStream.h"
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27 #include "IHttpStreamAnswer.h"
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28
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29 #include <list>
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30 #include <string>
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31 #include <stdint.h>
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32 #include <map>
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33 #include <vector>
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34
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35 namespace Orthanc
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36 {
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37 class ORTHANC_PUBLIC HttpOutput : public boost::noncopyable
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38 {
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39 private:
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40 typedef std::list< std::pair<std::string, std::string> > Header;
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41
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42 class StateMachine : public boost::noncopyable
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43 {
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44 public:
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45 enum State
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46 {
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47 State_WritingHeader,
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48 State_WritingBody,
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49 State_WritingMultipart,
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50 State_Done,
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51 State_WritingStream
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52 };
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53
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54 private:
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55 IHttpOutputStream& stream_;
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56 State state_;
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57
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58 HttpStatus status_;
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59 bool hasContentLength_;
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60 uint64_t contentLength_;
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61 uint64_t contentPosition_;
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62 bool keepAlive_;
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63 std::list<std::string> headers_;
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64
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65 std::string multipartBoundary_;
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66 std::string multipartContentType_;
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67
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68 void StartStreamInternal(const std::string& contentType);
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69
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70 public:
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71 StateMachine(IHttpOutputStream& stream,
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72 bool isKeepAlive);
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74 ~StateMachine();
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76 void SetHttpStatus(HttpStatus status);
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77
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78 void SetContentLength(uint64_t length);
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80 void SetContentType(const char* contentType);
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82 void SetContentFilename(const char* filename);
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83
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84 void SetCookie(const std::string& cookie,
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85 const std::string& value);
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87 void AddHeader(const std::string& header,
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88 const std::string& value);
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90 void ClearHeaders();
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92 void SendBody(const void* buffer, size_t length);
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93
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94 void StartMultipart(const std::string& subType,
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95 const std::string& contentType);
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96
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97 void SendMultipartItem(const void* item,
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98 size_t length,
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99 const std::map<std::string, std::string>& headers);
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100
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101 void CloseMultipart();
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102
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103 void CloseBody();
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104
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105 State GetState() const
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106 {
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107 return state_;
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108 }
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110 void CheckHeadersCompatibilityWithMultipart() const;
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112 void StartStream(const std::string& contentType);
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114 void SendStreamItem(const void* data,
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115 size_t size);
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117 void CloseStream();
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118 };
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119
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120 StateMachine stateMachine_;
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121 bool isDeflateAllowed_;
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122 bool isGzipAllowed_;
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123
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124 HttpCompression GetPreferredCompression(size_t bodySize) const;
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125
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126 public:
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127 HttpOutput(IHttpOutputStream& stream,
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128 bool isKeepAlive);
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129
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130 void SetDeflateAllowed(bool allowed);
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131
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132 bool IsDeflateAllowed() const;
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133
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134 void SetGzipAllowed(bool allowed);
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135
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136 bool IsGzipAllowed() const;
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137
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138 void SendStatus(HttpStatus status,
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139 const char* message,
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140 size_t messageSize);
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141
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142 void SendStatus(HttpStatus status);
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143
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144 void SendStatus(HttpStatus status,
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145 const std::string& message);
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146
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147 void SetContentType(MimeType contentType);
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148
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149 void SetContentType(const std::string& contentType);
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150
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151 void SetContentFilename(const char* filename);
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152
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153 void SetCookie(const std::string& cookie,
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154 const std::string& value);
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155
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156 void AddHeader(const std::string& key,
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157 const std::string& value);
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158
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159 void Answer(const void* buffer,
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160 size_t length);
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161
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162 void Answer(const std::string& str);
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163
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164 void AnswerEmpty();
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165
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166 void SendMethodNotAllowed(const std::string& allowed);
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167
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168 void Redirect(const std::string& path);
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169
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170 void SendUnauthorized(const std::string& realm);
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171
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172 void StartMultipart(const std::string& subType,
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173 const std::string& contentType);
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174
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175 void SendMultipartItem(const void* item,
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176 size_t size,
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177 const std::map<std::string, std::string>& headers);
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178
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179 void CloseMultipart();
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180
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181 bool IsWritingMultipart() const;
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182
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183 void Answer(IHttpStreamAnswer& stream);
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184
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185 /**
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186 * This method is a replacement to the combination
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187 * "StartMultipart()" + "SendMultipartItem()". It generates the
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188 * same answer, but it gives a chance to compress the body if
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189 * "Accept-Encoding: gzip" is provided by the client, which is not
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190 * possible in chunked transfers.
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191 **/
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192 void AnswerMultipartWithoutChunkedTransfer(
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193 const std::string& subType,
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194 const std::string& contentType,
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195 const std::vector<const void*>& parts,
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196 const std::vector<size_t>& sizes,
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197 const std::vector<const std::map<std::string, std::string>*>& headers);
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198
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199 /**
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200 * Contrarily to "Answer()", this method doesn't bufferizes the
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201 * stream before sending it, which reduces memory but cannot be
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202 * used to handle compression using "Content-Encoding".
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203 **/
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204 void AnswerWithoutBuffering(IHttpStreamAnswer& stream);
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205 };
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206 }