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annotate Core/HttpClient.cpp @ 1533:0011cc99443c

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improving HTTPS support
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 12 Aug 2015 17:52:10 +0200
parents 8a330b258491
children 95b3b0260240
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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32
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33 #include "PrecompiledHeaders.h"
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34 #include "HttpClient.h"
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35
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36 #include "Toolbox.h"
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37 #include "OrthancException.h"
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38 #include "Logging.h"
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39
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40 #include <string.h>
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41 #include <curl/curl.h>
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42 #include <boost/algorithm/string/predicate.hpp>
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43
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44
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45 static std::string cacert_;
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46 static bool httpsVerifyPeers_ = true;
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47
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48 extern "C"
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49 {
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50 static CURLcode GetHttpStatus(CURLcode code, CURL* curl, long* status)
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51 {
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52 if (code == CURLE_OK)
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53 {
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54 code = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, status);
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55 return code;
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56 }
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57 else
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58 {
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59 *status = 0;
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60 return code;
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61 }
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62 }
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63
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64 // This is a dummy wrapper function to suppress any OpenSSL-related
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65 // problem in valgrind. Inlining is prevented.
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66 #if defined(__GNUC__) || defined(__clang__)
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67 __attribute__((noinline))
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68 #endif
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69 static CURLcode OrthancHttpClientPerformSSL(CURL* curl, long* status)
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70 {
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71 return GetHttpStatus(curl_easy_perform(curl), curl, status);
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72 }
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73 }
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74
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77 namespace Orthanc
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78 {
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79 struct HttpClient::PImpl
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80 {
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81 CURL* curl_;
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82 struct curl_slist *postHeaders_;
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83 };
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84
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85
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86 static CURLcode CheckCode(CURLcode code)
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87 {
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88 if (code != CURLE_OK)
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89 {
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90 LOG(ERROR) << "libCURL error: " + std::string(curl_easy_strerror(code));
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91 throw OrthancException(ErrorCode_NetworkProtocol);
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92 }
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93
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94 return code;
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95 }
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96
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97
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98 static size_t CurlCallback(void *buffer, size_t size, size_t nmemb, void *payload)
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99 {
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100 std::string& target = *(static_cast<std::string*>(payload));
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101
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102 size_t length = size * nmemb;
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103 if (length == 0)
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104 return 0;
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105
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106 size_t pos = target.size();
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107
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108 target.resize(pos + length);
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109 memcpy(&target.at(pos), buffer, length);
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110
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111 return length;
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112 }
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113
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114
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115 void HttpClient::Setup()
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116 {
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117 pimpl_->postHeaders_ = NULL;
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118 if ((pimpl_->postHeaders_ = curl_slist_append(pimpl_->postHeaders_, "Expect:")) == NULL)
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119 {
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120 throw OrthancException(ErrorCode_NotEnoughMemory);
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121 }
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122
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123 pimpl_->curl_ = curl_easy_init();
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124 if (!pimpl_->curl_)
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125 {
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126 curl_slist_free_all(pimpl_->postHeaders_);
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127 throw OrthancException(ErrorCode_NotEnoughMemory);
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128 }
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129
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130 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_WRITEFUNCTION, &CurlCallback));
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131 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HEADER, 0));
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132 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_FOLLOWLOCATION, 1));
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133
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134 #if ORTHANC_SSL_ENABLED == 1
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135 if (httpsVerifyPeers_)
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136 {
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137 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CAINFO, cacert_.c_str()));
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138 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_SSL_VERIFYPEER, 1));
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139 }
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140 else
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141 {
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142 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_SSL_VERIFYPEER, 0));
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143 }
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144 #endif
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145
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146 // This fixes the "longjmp causes uninitialized stack frame" crash
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147 // that happens on modern Linux versions.
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148 // http://stackoverflow.com/questions/9191668/error-longjmp-causes-uninitialized-stack-frame
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149 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_NOSIGNAL, 1));
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150
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151 url_ = "";
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152 method_ = HttpMethod_Get;
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153 lastStatus_ = HttpStatus_200_Ok;
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154 isVerbose_ = false;
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155 timeout_ = 0;
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156 }
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157
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158
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159 HttpClient::HttpClient() : pimpl_(new PImpl)
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160 {
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161 Setup();
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162 }
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163
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164
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165 HttpClient::HttpClient(const HttpClient& other) : pimpl_(new PImpl)
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166 {
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167 Setup();
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168
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169 if (other.IsVerbose())
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170 {
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171 SetVerbose(true);
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172 }
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173
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174 if (other.credentials_.size() != 0)
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175 {
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176 credentials_ = other.credentials_;
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177 }
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178 }
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179
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180
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181 HttpClient::~HttpClient()
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182 {
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183 curl_easy_cleanup(pimpl_->curl_);
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184 curl_slist_free_all(pimpl_->postHeaders_);
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185 }
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186
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187
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188 void HttpClient::SetVerbose(bool isVerbose)
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189 {
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190 isVerbose_ = isVerbose;
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191
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192 if (isVerbose_)
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193 {
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194 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_VERBOSE, 1));
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195 }
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196 else
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197 {
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198 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_VERBOSE, 0));
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199 }
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200 }
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201
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202
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203 bool HttpClient::Apply(std::string& answer)
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204 {
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205 answer.clear();
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206 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_URL, url_.c_str()));
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207 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_WRITEDATA, &answer));
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208
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209 // Reset the parameters from previous calls to Apply()
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210 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPHEADER, NULL));
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211 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPGET, 0L));
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212 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POST, 0L));
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213 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_NOBODY, 0L));
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214 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CUSTOMREQUEST, NULL));
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215 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDS, NULL));
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216 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDSIZE, 0));
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217 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_PROXY, NULL));
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218
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219 // Set timeouts
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220 if (timeout_ <= 0)
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221 {
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222 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_TIMEOUT, 10)); /* default: 10 seconds */
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223 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CONNECTTIMEOUT, 10)); /* default: 10 seconds */
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224 }
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225 else
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226 {
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227 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_TIMEOUT, timeout_));
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228 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CONNECTTIMEOUT, timeout_));
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229 }
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230
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231 if (credentials_.size() != 0)
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232 {
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233 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_USERPWD, credentials_.c_str()));
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234 }
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235
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236 if (proxy_.size() != 0)
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237 {
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238 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_PROXY, proxy_.c_str()));
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239 }
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240
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241 switch (method_)
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242 {
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243 case HttpMethod_Get:
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244 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPGET, 1L));
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245 break;
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246
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247 case HttpMethod_Post:
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248 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POST, 1L));
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249 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPHEADER, pimpl_->postHeaders_));
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250 break;
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251
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252 case HttpMethod_Delete:
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253 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_NOBODY, 1L));
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254 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CUSTOMREQUEST, "DELETE"));
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255 break;
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256
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257 case HttpMethod_Put:
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258 // http://stackoverflow.com/a/7570281/881731: Don't use
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259 // CURLOPT_PUT if there is a body
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260
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261 // CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_PUT, 1L));
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262
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263 curl_easy_setopt(pimpl_->curl_, CURLOPT_CUSTOMREQUEST, "PUT"); /* !!! */
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264 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPHEADER, pimpl_->postHeaders_));
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265 break;
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266
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267 default:
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268 throw OrthancException(ErrorCode_InternalError);
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269 }
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270
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271
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272 if (method_ == HttpMethod_Post ||
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273 method_ == HttpMethod_Put)
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274 {
0
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275 if (postData_.size() > 0)
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276 {
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277 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDS, postData_.c_str()));
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278 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDSIZE, postData_.size()));
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279 }
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280 else
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281 {
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282 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDS, NULL));
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283 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDSIZE, 0));
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284 }
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285 }
0
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286
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287
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288 // Do the actual request
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289 CURLcode code;
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290 long status = 0;
0
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291
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292 if (boost::starts_with(url_, "https://"))
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293 {
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294 code = OrthancHttpClientPerformSSL(pimpl_->curl_, &status);
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295 }
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296 else
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297 {
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298 code = GetHttpStatus(curl_easy_perform(pimpl_->curl_), pimpl_->curl_, &status);
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299 }
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300
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301 CheckCode(code);
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302
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303 if (status == 0)
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304 {
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305 // This corresponds to a call to an inexistent host
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306 lastStatus_ = HttpStatus_500_InternalServerError;
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307 }
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308 else
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309 {
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310 lastStatus_ = static_cast<HttpStatus>(status);
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311 }
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312
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313 return (status >= 200 && status < 300);
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314 }
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315
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316
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317 bool HttpClient::Apply(Json::Value& answer)
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318 {
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319 std::string s;
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320 if (Apply(s))
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321 {
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322 Json::Reader reader;
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323 return reader.parse(s, answer);
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324 }
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325 else
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326 {
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327 return false;
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328 }
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329 }
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330
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331
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332 void HttpClient::SetCredentials(const char* username,
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333 const char* password)
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334 {
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335 credentials_ = std::string(username) + ":" + std::string(password);
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336 }
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337
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338
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339 void HttpClient::GlobalInitialize(bool httpsVerifyPeers,
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340 const std::string& httpsVerifyCertificates)
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341 {
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342 #if ORTHANC_SSL_ENABLED == 1
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343 httpsVerifyPeers_ = httpsVerifyPeers;
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344 cacert_ = httpsVerifyCertificates;
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345
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346 // TODO
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347 /*if (cacert_.empty())
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348 {
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349 cacert_ = "/etc/ssl/certs/ca-certificates.crt";
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350 }*/
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351
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352 if (httpsVerifyPeers)
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353 {
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354 if (cacert_.empty())
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355 {
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356 LOG(WARNING) << "No certificates are provided to validate peers, "
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357 << "set \"HttpsCertificatesFile\" if you need to do HTTPS requests";
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358 }
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359 else
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360 {
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361 LOG(WARNING) << "HTTPS will use the certificates from this file: " << cacert_;
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362 }
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363 }
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364 else
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365 {
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366 LOG(WARNING) << "The verification of the peers in HTTPS requests is disabled!";
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367 }
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368 #endif
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369
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370 CheckCode(curl_global_init(CURL_GLOBAL_DEFAULT));
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371 }
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372
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373
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374 void HttpClient::GlobalFinalize()
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375 {
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376 curl_global_cleanup();
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377 }
0
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378 }