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  1. Qt
  2. QTBUG-112894

QNetworkReply::canReadLine return false before read

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P1: Critical P1: Critical
    • None
    • 6.5.0
    • Network: HTTP
    • None

      Since Qt6.5 (well, after 6.2.4), calling canreadline on a QNetworkReply returns false before reading. This code prints false and true.

         QNetworkRequest request( QUrl( "https://www.test.com" ) ) ;
   QNetworkAccessManager networkAccessManager ;
   auto reply = networkAccessManager.get( request ) ;
   QObject::connect( reply, &QIODevice::readyRead,
      [reply]()
      {
          qDebug() << reply->canReadLine() ;
          reply->peek( 1 ) ;
          qDebug() << reply->canReadLine() ;
      } ) ;

      Seems to be related to :

      Peeking one character is a workaround, but I think data should be decompressed before any call to canreadline.

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            manordheim Mårten Nordheim
            mjtdcp Mathieu Joubert
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