QNetworkAccessManager https UnknownNetworkError when using pyside2

belalshehab

Hello, I’m using the QNetworkAccessManager module and it works fine with HTTP requests, but when I try to do https requests it fails and returns “PySide2.QtNetwork.QNetworkReply.NetworkError.UnknownNetworkError: TLS initialization failed”
this problem only happens with pyside2 on windows.
but it works fine on Mac os.
when I used the same piece of code with pyqt5 it worked just fine on both Windows and Mac os.
https requests:
1.pyside2 on windows: fails
2.pyside2 on mac: works fine
3. pyqt5 on windows: works fine
4. pyqt5 on mac: works fine
and I’m stuck with it for a while and can’t seem to find the problem.

from PySide2 import QtNetwork
from PySide2 import QtCore
import sys, json

class Example:

def __init__(self):
    self.nam = QtNetwork.QNetworkAccessManager()
    self.nam.finished.connect(self.handle_response)

def do_request(self):
    url = 'https://httpbin.org/get'
    req = QtNetwork.QNetworkRequest(QtCore.QUrl(url))
    self.nam.get(req)

def handle_response(self, reply):
    er = reply.error()
    if er == QtNetwork.QNetworkReply.NoError:
        bytes_string = reply.readAll()
        print(str(bytes_string, 'utf-8'))
    else:
        print(f'Error occurred: {er}: {reply.errorString()}')
    QtCore.QCoreApplication.quit()
def main():
app = QtCore.QCoreApplication([])
ex = Example()
ex.do_request()
sys.exit(app.exec_())

if name == ‘main’:
main()

I’m using python 3.7 and pyside2 5.15

SGaist

Hi and welcome to devnet,

Do you also have OpenSSL available on your machine ?

belalshehab

Yes, and when I tried to run using the command line, these errors popup.

and I configured the environment variable to point to
located on C:\Program Files\OpenSSL-Win64\bin
and I'm not sure why It is searching the C:\WINDOWS path

SGaist

Because it's higher in the list.

But in any case, having OpenSSL in the Windows folder is usually a bad sign. That's typically a library that shall be provided along an application and not forced there.

belalshehab

I looked into the pyside2 package installed on my machine and it seems that it doesn't come with its own libssl-1_1-x64.dll unlike pyqt5 package which comes with its own version.

I don't know what version that pyside2 requires, and how to fix this ?!!

SGaist

The Qt Online Installer has an option to download a suitable version of OpenSSL.

How are you installing PySide2 ?

belalshehab

I installed it using pip
pip install pyside2

I'm on windows using python 3.7