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Thread: HTTP GET authentication does not proceed

  1. 27th May 2009, 22:03 #1
    SailingDreams
    SailingDreams is offline Beginner
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    Default HTTP GET authentication does not proceed

    I am trying to authenticate but get the QT "Authentication required" from the QT requestFinished handler. My code outputs the qDebug below. The "Authenication req'd ..." statement gets printed when the QT signal authenticationRequired is fired. So since the authentication signal fired, and can't figure out why I get teh "Authentication required" error.

    When I look at the wireShark trace, I can see the HTTP 401 unauthorized response from the server and then I see the TCP connection close (as it should). But what does not happen is QT creating a new TCP session followed by the second GET - this one having the authentication info (password and username).

    I stepped into the QAuthenticator::setpassword and setuser and I can see the passworkd and user being set.

    The error output is kinda useless.

    I have compared my code to the QT examples and I don't think I am missing anything that would prevent the second TCP session from starting.

    I also have my code below the qDebug output. Any ideas what I am missing?

    Qt Code: 
    1. HTTP requestStarted slot handler for request type setHost (id = 1)
    2. HTTP requestFinished handler: error for request setHost, error = No error
    3. HTTP done signal slot handler. No Error.
    4. HTTP requestStarted slot handler for request type GET (id = 2)
    5. HTTP State for request type GET changed to Connecting
    6. HTTP State for request type GET changed to Sending
    7. HTTP State for request type GET changed to Reading
    8. Authentication req'd for host 169.xxx.xxx.xxx, User Name = root, Password = smokey
    9. HTTP requestFinished handler: error for request GET, error = Authentication required
    10. HTTP done signal slot handler. Error: Authentication required
    11. HTTP State for request type  changed to Closing
    12. HTTP State for request type  changed to Unconnected
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    My cpp file. The run() is at the bottom.

    Qt Code: 
    1. #include <QtCore/QCoreApplication>
    2. #include <QThread>
    3. #include <QHttp>
    4. #include <QTimer>
    5. #include <QUrl>
    6. #include <QHash>
    7. #include "MyThread.h"
    8. #include "Windows.h"
    9.  
    10. //----------------------------------------------------------------------------------
    11. MyThread::MyThread()
    12. {
    13. }
    14. //----------------------------------------------------------------------------------
    15. void MyThread::done( bool error ) // true if error occurs
    16. {
    17. 	if(error)
    18. 	{
    19.         QHttp::Error err = m_pHttp->error();
    20.         QString err_Str = m_pHttp->errorString();
    21. 		qDebug("HTTP done signal slot handler. Error: %s", err_Str.toAscii().data());
    22. 	}
    23. 	else
    24. 		qDebug("HTTP done signal slot handler. No Error.");
    25. }
    26.  
    27. //-------------------------------------------------------------------------------------------
    28. void MyThread::init(void)
    29. {
    30. 	m_Host = "169.254.177.84";
    31.     m_UserName = "root";
    32.     m_Password = "smokey";
    33. 	m_HttpPort = 80;
    34.     m_SerialPort = 1;
    35.  
    36. 	m_HttpStateTable[QHttp::Unconnected] = "Unconnected";
    37.     m_HttpStateTable[QHttp::HostLookup]  = "HostLookup";
    38.     m_HttpStateTable[QHttp::Connecting]  = "Connecting";
    39.     m_HttpStateTable[QHttp::Sending]     = "Sending";
    40. 	m_HttpStateTable[QHttp::Reading]     = "Reading";
    41.     m_HttpStateTable[QHttp::Connected]   = "Connected";    
    42.     m_HttpStateTable[QHttp::Closing]     = "Closing";    
    43.  
    44. }
    45. // -----------------------------------------------------------------------------
    46. void MyThread::initSignalsAndSlots(void)
    47. {
    48.     connect(m_pHttp, SIGNAL(authenticationRequired(const QString &, quint16, QAuthenticator *)),
    49.             this, SLOT(slotAuthenticationRequired(const QString &, quint16, QAuthenticator *)));
    50.     connect( m_pHttp, SIGNAL( requestStarted ( int ) ), this, SLOT( requestStarted( int ) ) );
    51.     connect( m_pHttp, SIGNAL( requestFinished ( int , bool  ) ), this, SLOT( requestFinished ( int , bool ) ) );
    52.     connect( m_pHttp, SIGNAL( stateChanged ( int  ) ), this, SLOT( stateChanged ( int ) ) );
    53.     connect( m_pHttp, SIGNAL(responseHeaderReceived(const QHttpResponseHeader &)),
    54.                  this, SLOT(readResponseHeader(const QHttpResponseHeader &)));
    55.     connect( m_pHttp, SIGNAL( done ( bool  ) ), this, SLOT( done (bool ) ) );
    56. }
    57.  
    58.  // -----------------------------------------------------------------------------
    59. void MyThread::requestStarted( int id )
    60. {
    61.     qDebug( "HTTP requestStarted slot handler for request type %s (id = %d)", 
    62.                                m_httpRequestIdHashTable[id].toAscii().data(),id);
    63.     int nothing = 0;
    64.     nothing++;
    65. }
    66.  
    67. // -----------------------------------------------------------------------------
    68.  
    69. void MyThread::requestFinished( int id, bool error )
    70. {
    71.     //qDebug( "HTTP requestFinished slot handler for request type %s (id = %d), error = %d", 
    72.     //                            m_httpRequestIdHashTable[id].toAscii().data(), id, error);
    73.  
    74. 	int nothing = 0;
    75.     nothing++;
    76.     QString err_Str = "No error";
    77.     if( error )
    78.     {
    79.         QHttp::Error err = m_pHttp->error();
    80.         err_Str = m_pHttp->errorString();
    81.         nothing--;
    82. 	}
    83. 	qDebug( "HTTP requestFinished handler: error for request %s, error = %s", 
    84. 			         m_httpRequestIdHashTable[id].toAscii().data(), err_Str.toAscii().data());
    85. }
    86. // -----------------------------------------------------------------------------
    87. void MyThread::readResponseHeader(const QHttpResponseHeader &responseHeader)
    88. {
    89. # if 1
    90. 	switch (responseHeader.statusCode()) {
    91.     case 200:                   // Ok
    92.     //case 301:                   // Moved Permanently
    93.     //case 302:                   // Found
    94.     //case 303:                   // See Other
    95.     //case 307:                   // Temporary Redirect
    96.     {
    97.         qDebug("HTTP Header status 200 (OK) found");
    98.  
    99.         // See if there are pending requests
    100. 		if(m_pHttp->hasPendingRequests())
    101. 			qDebug("There are pending requests.");
    102. 		else
    103. 			qDebug("There are NO pending requests.");
    104.  
    105. 		// Get info on current ID
    106.         int id = m_pHttp->currentId();
    107.         qDebug( "Closing connection for request type %s", 
    108.                                 m_httpRequestIdHashTable[id].toAscii().data());
    109.         //emit( abortHttpConnection() );  //??ejp This kills the TCP link and stops the video stream. 
    110.         m_pHttp->clearPendingRequests(); // clear pending request and start close request.
    111.         id = m_pHttp->close();    // Tried close() but nothing happened.
    112.         m_httpRequestIdHashTable.insert(id,"close");
    113.         break;
    114. 	}
    115.     default:
    116.         //QMessageBox::information(this, tr("HTTP"),
    117.         //                         tr("Download failed: %1.")
    118.         //                         .arg(responseHeader.reasonPhrase()));
    119. 	    break;
    120.     }
    121. #endif
    122. }
    123. //----------------------------------------------------------------------------------
    124. void MyThread::slotAuthenticationRequired(const QString & hostname, 
    125.                                    quint16 port, QAuthenticator * authenticator)
    126. {
    127. 	qDebug( "Authentication req'd for host %s, User Name = %s, Password = %s", 
    128. 		    hostname.toAscii().data(), m_UserName.toAscii().data(), m_Password.toAscii().data() );  //??ejp debug
    129.     authenticator->setUser( m_UserName );
    130.     authenticator->setPassword( m_Password );
    131.  
    132. }
    133. //----------------------------------------------------------------------------------
    134. void MyThread::stateChanged( int state) 
    135. {
    136.     Q_ASSERT(state < 7);  // There are only 7 states for QHTTP
    137.     QString request =  m_httpRequestIdHashTable[m_pHttp->currentId()];
    138.     qDebug( "HTTP State for request type %s changed to %s", 
    139.                   request.toAscii().data(), m_HttpStateTable[state].toAscii().data());
    140. }
    141.  
    142. //----------------------------------------------------------------------------------
    143. void MyThread::callbackFunc(void)
    144. {
    145.     int id = m_pHttp->setHost( m_Host, QHttp::ConnectionModeHttp, m_HttpPort  ); 
    146.     m_httpRequestIdHashTable.insert(id,"setHost");
    147.  
    148.     Sleep( 100); // wait for setHost to finish.
    149.  
    150.     QString port_str = QString::number( m_SerialPort+1 );
    151.     #if 0
    152.         QString url_for_cmds = QString("/axis-cgi/com/serial.cgi?port=" + port_str );
    153.     #else
    154. 	    QString url_for_cmds = QString("/axis-cgi/mjpg/video.cgi");
    155. 	#endif
    156.     id = m_pHttp->get(QUrl::toPercentEncoding(url_for_cmds) ); 
    157.     m_httpRequestIdHashTable.insert(id,"GET");
    158.  
    159.     id = m_pHttp->get(url_for_cmds ); 
    160.     m_httpRequestIdHashTable.insert(id,"GET");
    161.  
    162.     //while(1)
    163.     //  Sleep( 10);
    164.  
    165. 	//m_pHttp->get();
    166. };
    167.  
    168. //----------------------------------------------------------------------------------
    169. void MyThread::run(void)
    170. {
    171.     init();
    172. 	m_pHttp = new QHttp();
    173.     initSignalsAndSlots();  // Need m_pHttp initialized first!
    174.  
    175.     QTimer::singleShot(1000, this, SLOT(callbackFunc()));  // milli second timeout.
    176.  
    177. 	//m_pTimer = new QTimer(callback ;
    178.  
    179. 	QThread::exec ();  
    180. 	//int res = QCoreApplication::exec();
    181.  
    182. };
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  2. 28th May 2009, 00:36 #2
    wysota's Avatar
    wysota
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    Default Re: HTTP GET authentication does not proceed

    QHttp won't "rerequest" a failed request. It's a low-level mechanism, not a full blown solution. If you get an authentication error, it is your responsibility to set the user and password and send another request.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.

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  3. 1st June 2009, 01:27 #3
    SailingDreams
    SailingDreams is offline Beginner
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    Default Re: HTTP GET authentication does not proceed

    I'm confused then by the QT exaple in

    http://doc.trolltech.com/4.4/network-http.html

    I followed the QT example where they set the password in the slot connected to the QHttp signal authenticationRequired(). I copied the QT example slot function below.

    Qt Code: 
    1. void HttpWindow::slotAuthenticationRequired(const QString &hostName, quint16, QAuthenticator *authenticator)
    2.  {
    3.      QDialog dlg;
    4.      Ui::Dialog ui;
    5.      ui.setupUi(&dlg);
    6.      dlg.adjustSize();
    7.      ui.siteDescription->setText(tr("%1 at %2").arg(authenticator->realm()).arg(hostName));
    8.  
    9.      if (dlg.exec() == QDialog::Accepted) {
    10.          authenticator->setUser(ui.userEdit->text());
    11.          authenticator->setPassword(ui.passwordEdit->text());
    12.      }
    13.  }
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    When I looked at the example's header response handler below, it does not have any case for authentication required. So perhaps the example is incorrect? Should it have a case 401 Unauthorized? I understand what you are saying about handling the error manually, but I'd sure like to know how QT's example is supposed to work.

    Qt Code: 
    1. void HttpWindow::readResponseHeader(const QHttpResponseHeader &responseHeader)
    2.  {
    3.      switch (responseHeader.statusCode()) {
    4.      case 200:                   // Ok
    5.      case 301:                   // Moved Permanently
    6.      case 302:                   // Found
    7.      case 303:                   // See Other
    8.      case 307:                   // Temporary Redirect
    9.          // these are not error conditions
    10.          break;
    11.  
    12.      default:
    13.          QMessageBox::information(this, tr("HTTP"),
    14.                                   tr("Download failed: %1.")
    15.                                   .arg(responseHeader.reasonPhrase()));
    16.          httpRequestAborted = true;
    17.          progressDialog->hide();
    18.          http->abort();
    19.      }
    20.  }
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