Qt Code: 
  1. #include <QCoreApplication>
  2. #include <QNetworkAccessManager>
  3. #include <QNetworkRequest>
  4. #include <QNetworkReply>
  5. #include <QUrlQuery>
  6. #include <QDebug>
  7. #include <QSslConfiguration>
  8.  
  9. class Fetch: public QObject
  10. {
  11.     Q_OBJECT
  12. public:
  13.     Fetch(QObject *p = 0):
  14.         QObject(p),
  15.         mgr(new QNetworkAccessManager(this)),
  16.         reply(0)
  17.     {
  18.         QNetworkRequest req(QUrl("https://api.twitter.com/1.1/statuses/update.json"));
  19.  
  20.         // Standard header
  21.         req.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
  22.  
  23.         // The non-standard header
  24.         req.setRawHeader(
  25.             QByteArray("Authorization"), 
  26.             QByteArray( "OAuth "
  27.                         "oauth_consumer_key=\"ir0j0XHEZAjl5OIMLvRtGDpvz\", "
  28.                         "oauth_nonce=\"d0d616f462d9d3dd5bb39b23b2ae76ea\", "
  29.                         "oauth_signature=\"2IAkMds2Pxtp699MReoyupgfZl8%3D\", "
  30.                         "oauth_signature_method=\"HMAC-SHA1\", "
  31.                         "oauth_timestamp=\"1441658718\", "
  32.                         "oauth_token=\"3427524377-klG6CAjAWyWOo9eR7g6WtRm8nGoo9CtQHSX3jpC\", "
  33.                         "oauth_version=\"1.0\" "
  34.             )
  35.         );
  36.  
  37.         // The POST payload
  38.         QUrlQuery payload;
  39.         payload.addQueryItem("status", "ekmek");
  40.         QByteArray data = payload.query(QUrl::FullyEncoded).toLocal8Bit();
  41.  
  42.         reply = mgr->post(req, data);
  43.         connect(reply, SIGNAL(finished()), SLOT(finished()));
  44.     }
  45. private slots:
  46.     void error(QNetworkReply::NetworkError code) {
  47.         qDebug() << Q_FUNC_INFO << code;
  48.     }
  49.  
  50.     void sslErrors(const QList<QSslError> & errors) {
  51.         qDebug() << Q_FUNC_INFO << errors;
  52.     }
  53.  
  54.     void finished() {
  55.         qDebug() << Q_FUNC_INFO << reply->readAll();
  56.         reply->deleteLater();
  57.         qApp->exit();
  58.     }
  59.  
  60. private:
  61.     QNetworkAccessManager *mgr;
  62.     QNetworkReply *reply;
  63. };
  64.  
  65. int main(int argc, char *argv[])
  66. {
  67.     QCoreApplication a(argc, argv);
  68.  
  69.     // Something like this if you need it
  70. #if 0
  71.     QSslConfiguration config = QSslConfiguration::defaultConfiguration();
  72.     QList<QSslCertificate> certs = config.caCertificates();
  73.     certs << QSslCertificate::fromPath("cacert.pem", QSsl::Pem);
  74.     config.setCaCertificates(certs);
  75.     QSslConfiguration::setDefaultConfiguration(config);
  76. #endif    
  77.  
  78.     Fetch f;
  79.     return a.exec();
  80. }
  81.  
  82. #include "main.moc"
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Connects to Twiteer but fails:
Qt Code: 
  1. void Fetch::finished() "{"errors":[{"code":32,"message":"Could not authenticate you."}]}"
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so it clearly connected to Twitter without SSL errors.