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annotate Core/HttpServer/HttpOutput.h @ 3747:7b6058f8f7aa transcoding

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new branch: transcoding
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 13 Mar 2020 08:32:13 +0100
parents 94f4a18a79cc
children f9863630ec7f
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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) 2017-2020 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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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33
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34 #pragma once
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35
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36 #include "../Enumerations.h"
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37 #include "IHttpOutputStream.h"
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38 #include "IHttpStreamAnswer.h"
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39
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40 #include <list>
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41 #include <string>
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42 #include <stdint.h>
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43 #include <map>
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44 #include <vector>
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45
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46 namespace Orthanc
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47 {
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48 class HttpOutput : public boost::noncopyable
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49 {
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50 private:
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51 typedef std::list< std::pair<std::string, std::string> > Header;
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52
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53 class StateMachine : public boost::noncopyable
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54 {
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55 public:
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56 enum State
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57 {
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58 State_WritingHeader,
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59 State_WritingBody,
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60 State_WritingMultipart,
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61 State_Done
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62 };
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63
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64 private:
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65 IHttpOutputStream& stream_;
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66 State state_;
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67
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68 HttpStatus status_;
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69 bool hasContentLength_;
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70 uint64_t contentLength_;
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71 uint64_t contentPosition_;
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72 bool keepAlive_;
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73 std::list<std::string> headers_;
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75 std::string multipartBoundary_;
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76 std::string multipartContentType_;
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77
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78 public:
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79 StateMachine(IHttpOutputStream& stream,
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80 bool isKeepAlive);
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81
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82 ~StateMachine();
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83
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84 void SetHttpStatus(HttpStatus status);
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85
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86 void SetContentLength(uint64_t length);
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87
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88 void SetContentType(const char* contentType);
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89
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90 void SetContentFilename(const char* filename);
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91
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92 void SetCookie(const std::string& cookie,
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93 const std::string& value);
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95 void AddHeader(const std::string& header,
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96 const std::string& value);
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98 void ClearHeaders();
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100 void SendBody(const void* buffer, size_t length);
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101
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102 void StartMultipart(const std::string& subType,
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103 const std::string& contentType);
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104
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105 void SendMultipartItem(const void* item,
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106 size_t length,
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107 const std::map<std::string, std::string>& headers);
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108
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109 void CloseMultipart();
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110
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111 void CloseBody();
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112
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113 State GetState() const
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114 {
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115 return state_;
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116 }
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117
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118 void CheckHeadersCompatibilityWithMultipart() const;
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119 };
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120
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121 StateMachine stateMachine_;
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122 bool isDeflateAllowed_;
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123 bool isGzipAllowed_;
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124
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125 HttpCompression GetPreferredCompression(size_t bodySize) const;
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126
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127 public:
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128 HttpOutput(IHttpOutputStream& stream,
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129 bool isKeepAlive) :
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130 stateMachine_(stream, isKeepAlive),
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131 isDeflateAllowed_(false),
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132 isGzipAllowed_(false)
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133 {
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134 }
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135
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136 void SetDeflateAllowed(bool allowed)
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137 {
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138 isDeflateAllowed_ = allowed;
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139 }
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140
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141 bool IsDeflateAllowed() const
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142 {
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143 return isDeflateAllowed_;
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144 }
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145
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146 void SetGzipAllowed(bool allowed)
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147 {
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148 isGzipAllowed_ = allowed;
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149 }
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150
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151 bool IsGzipAllowed() const
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152 {
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153 return isGzipAllowed_;
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154 }
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155
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156 void SendStatus(HttpStatus status,
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157 const char* message,
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158 size_t messageSize);
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159
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160 void SendStatus(HttpStatus status)
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161 {
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162 SendStatus(status, NULL, 0);
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163 }
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164
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165 void SendStatus(HttpStatus status,
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166 const std::string& message)
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167 {
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168 SendStatus(status, message.c_str(), message.size());
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169 }
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170
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171 void SetContentType(MimeType contentType)
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172 {
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173 stateMachine_.SetContentType(EnumerationToString(contentType));
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174 }
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175
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176 void SetContentType(const std::string& contentType)
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177 {
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178 stateMachine_.SetContentType(contentType.c_str());
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179 }
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180
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181 void SetContentFilename(const char* filename)
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182 {
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183 stateMachine_.SetContentFilename(filename);
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184 }
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185
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186 void SetCookie(const std::string& cookie,
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187 const std::string& value)
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188 {
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189 stateMachine_.SetCookie(cookie, value);
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190 }
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191
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192 void AddHeader(const std::string& key,
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193 const std::string& value)
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194 {
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195 stateMachine_.AddHeader(key, value);
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196 }
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197
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198 void Answer(const void* buffer,
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199 size_t length);
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200
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201 void Answer(const std::string& str);
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202
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203 void AnswerEmpty();
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204
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205 void SendMethodNotAllowed(const std::string& allowed);
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206
217
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207 void Redirect(const std::string& path);
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208
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209 void SendUnauthorized(const std::string& realm);
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210
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211 void StartMultipart(const std::string& subType,
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212 const std::string& contentType)
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213 {
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214 stateMachine_.StartMultipart(subType, contentType);
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215 }
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216
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217 void SendMultipartItem(const void* item,
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218 size_t size,
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219 const std::map<std::string, std::string>& headers)
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220 {
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221 stateMachine_.SendMultipartItem(item, size, headers);
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222 }
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223
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224 void CloseMultipart()
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225 {
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226 stateMachine_.CloseMultipart();
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227 }
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228
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229 bool IsWritingMultipart() const
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230 {
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231 return stateMachine_.GetState() == StateMachine::State_WritingMultipart;
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232 }
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233
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234 void Answer(IHttpStreamAnswer& stream);
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235
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236 /**
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237 * This method is a replacement to the combination
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238 * "StartMultipart()" + "SendMultipartItem()". It generates the
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239 * same answer, but it gives a chance to compress the body if
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240 * "Accept-Encoding: gzip" is provided by the client, which is not
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241 * possible in chunked transfers.
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242 **/
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243 void AnswerMultipartWithoutChunkedTransfer(
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244 const std::string& subType,
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245 const std::string& contentType,
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246 const std::vector<const void*>& parts,
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247 const std::vector<size_t>& sizes,
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248 const std::vector<const std::map<std::string, std::string>*>& headers);
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249 };
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250 }