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annotate OrthancFramework/Sources/HttpServer/HttpOutput.h @ 5317:9875e1f24394

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author Alain Mazy <am@osimis.io>
date Thu, 22 Jun 2023 21:30:45 +0200
parents 0ea402b4d901
children aaf7c49a9ddc 3206537cbb56
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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24 #pragma once
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25
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26 #include "../Enumerations.h"
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27 #include "IHttpOutputStream.h"
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28 #include "IHttpStreamAnswer.h"
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29
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30 #include <list>
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31 #include <string>
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32 #include <stdint.h>
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33 #include <map>
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34 #include <vector>
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35
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36 namespace Orthanc
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37 {
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38 class ORTHANC_PUBLIC HttpOutput : public boost::noncopyable
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39 {
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40 private:
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41 typedef std::list< std::pair<std::string, std::string> > Header;
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42
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43 class StateMachine : public boost::noncopyable
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44 {
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45 public:
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46 enum State
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47 {
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48 State_WritingHeader,
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49 State_WritingBody,
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50 State_WritingMultipart,
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51 State_Done,
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52 State_WritingStream
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53 };
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54
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55 private:
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56 IHttpOutputStream& stream_;
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57 State state_;
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58
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59 HttpStatus status_;
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60 bool hasContentLength_;
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61 uint64_t contentLength_;
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62 uint64_t contentPosition_;
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63 bool keepAlive_;
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64 unsigned int keepAliveTimeout_;
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65 std::list<std::string> headers_;
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66
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67 std::string multipartBoundary_;
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68 std::string multipartContentType_;
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69
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70 void StartStreamInternal(const std::string& contentType);
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72 public:
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73 StateMachine(IHttpOutputStream& stream,
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74 bool isKeepAlive,
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75 unsigned int keepAliveTimeout);
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77 ~StateMachine();
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79 void SetHttpStatus(HttpStatus status);
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80
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81 void SetContentLength(uint64_t length);
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82
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83 void SetContentType(const char* contentType);
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84
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85 void SetContentFilename(const char* filename);
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87 void SetCookie(const std::string& cookie,
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88 const std::string& value);
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90 void AddHeader(const std::string& header,
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91 const std::string& value);
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93 void ClearHeaders();
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95 void SendBody(const void* buffer, size_t length);
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96
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97 void StartMultipart(const std::string& subType,
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98 const std::string& contentType);
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99
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100 void SendMultipartItem(const void* item,
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101 size_t length,
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102 const std::map<std::string, std::string>& headers);
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103
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104 void CloseMultipart();
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105
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106 void CloseBody();
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107
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108 State GetState() const
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109 {
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110 return state_;
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111 }
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113 void CheckHeadersCompatibilityWithMultipart() const;
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115 void StartStream(const std::string& contentType);
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117 void SendStreamItem(const void* data,
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118 size_t size);
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120 void CloseStream();
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121 };
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122
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123 StateMachine stateMachine_;
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124 bool isDeflateAllowed_;
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125 bool isGzipAllowed_;
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126
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127 HttpCompression GetPreferredCompression(size_t bodySize) const;
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128
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129 public:
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130 HttpOutput(IHttpOutputStream& stream,
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131 bool isKeepAlive,
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132 unsigned int keepAliveTimeout);
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133
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134 void SetDeflateAllowed(bool allowed);
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135
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136 bool IsDeflateAllowed() const;
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137
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138 void SetGzipAllowed(bool allowed);
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139
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140 bool IsGzipAllowed() const;
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141
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142 void SendStatus(HttpStatus status,
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143 const char* message,
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144 size_t messageSize);
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145
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146 void SendStatus(HttpStatus status);
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147
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148 void SendStatus(HttpStatus status,
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149 const std::string& message);
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150
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151 void SetContentType(MimeType contentType);
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152
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153 void SetContentType(const std::string& contentType);
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154
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155 void SetContentFilename(const char* filename);
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156
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157 void SetCookie(const std::string& cookie,
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158 const std::string& value);
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159
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160 void AddHeader(const std::string& key,
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161 const std::string& value);
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162
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163 void Answer(const void* buffer,
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164 size_t length);
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165
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166 void Answer(const std::string& str);
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167
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168 void AnswerEmpty();
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169
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170 void SendMethodNotAllowed(const std::string& allowed);
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171
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172 void Redirect(const std::string& path);
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173
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174 void SendUnauthorized(const std::string& realm);
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175
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176 void StartMultipart(const std::string& subType,
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177 const std::string& contentType);
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178
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179 void SendMultipartItem(const void* item,
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180 size_t size,
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181 const std::map<std::string, std::string>& headers);
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182
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183 void CloseMultipart();
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184
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185 bool IsWritingMultipart() const;
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186
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187 void Answer(IHttpStreamAnswer& stream);
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188
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189 /**
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190 * This method is a replacement to the combination
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191 * "StartMultipart()" + "SendMultipartItem()". It generates the
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192 * same answer, but it gives a chance to compress the body if
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193 * "Accept-Encoding: gzip" is provided by the client, which is not
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194 * possible in chunked transfers.
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195 **/
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196 void AnswerMultipartWithoutChunkedTransfer(
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197 const std::string& subType,
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198 const std::string& contentType,
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199 const std::vector<const void*>& parts,
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200 const std::vector<size_t>& sizes,
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201 const std::vector<const std::map<std::string, std::string>*>& headers);
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202
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203 /**
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204 * Contrarily to "Answer()", this method doesn't bufferizes the
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205 * stream before sending it, which reduces memory but cannot be
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206 * used to handle compression using "Content-Encoding".
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207 **/
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208 void AnswerWithoutBuffering(IHttpStreamAnswer& stream);
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209 };
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210 }