Use QgsBlockingNetworkRequest to download a file

qgsblockingnetworkrequest_example.py

# Just chucking this here because the documentation's a little weak and someone
# might find it useful. This has changed a few times in QGIS history.

# NB this was hacked up from some code that worked in QGIS 3.4, 3.10 and 3.14, it 
# may have minor indentation issues but … this is the gist of it.

from qgis.PyQt.QtCore import QObject, QUrl
from qgis.PyQt.QtNetwork import QNetworkReply, QNetworkRequest

from qgis.core import Qgis, QgsMessageLog, QgsBlockingNetworkRequest

from .utils import guiError, qgsDebug

def doSomething(content):
    """Do something with the content of the downloaded file."""
    textContent = bytes(content).decode()
    pass

def downloadFile(self, url):
    """Download a file with QgsBlockingNetworkRequest."""
    request = QNetworkRequest(url))

    # use a blocking request here
    blockingRequest = QgsBlockingNetworkRequest()
    result = blockingRequest.get(request)
    if result == QgsBlockingNetworkRequest.NoError:
        reply = blockingRequest.reply()
        if reply.error() == QNetworkReply.NoError:
            doSomething(reply.content())
        else:
            QgsMessageLog.logMessage(reply.errorString(), tag="Gist Error", level=Qgis.Info)
    else:
        QgsMessageLog.logMessage(reply.errorString(), tag="Gist Error", level=Qgis.Info)