QGIS » QGIS Application

When using QgsNetworkAccessManager.createRequest() to initiate a download I find that despite completing successfully, and providing the correct data, a network time out error is displayed on the GUI via the Message Bar and the Message Log.

It can be reproduced by pasting the following into the Python Console:

from datetime import datetime
from PyQt4.QtCore import SIGNAL, QUrl
from PyQt4.QtNetwork import QNetworkAccessManager, QNetworkRequest

def request_download():
    global reply
    manager = QgsNetworkAccessManager.instance()
    url = QUrl("http://www.example.net")
    request = QNetworkRequest(url)
    print "Download start time: {}".format(datetime.now())
    reply = manager.createRequest(QNetworkAccessManager.GetOperation, request)
    reply.connect(reply, SIGNAL("finished()"), handle_download)

def handle_download():
    global reply
    print "Download finish time: {}".format(datetime.now())
    print "Finished: {}".format(reply.isFinished())
    print "Bytes received: {}".format(len(reply.readAll()))

request_download()

# python console:
#   Download start time: 2015-02-23 15:24:39.887000
#   Download finish time: 2015-02-23 15:24:41.077000
#   Finished: True
#   Bytes received: 1270
# 
# message log:
#   2015-02-23T15:25:01    1    Network request http://www.example.com timed out

Discussion of this issue is available on GIS.SE:
http://gis.stackexchange.com/questions/136369/download-file-from-network-using-pyqgis-2-x/