Question

I’m writing a PyQt (Python bindings for the all-powerful Qt library) application and a small part of my application needs a web browser (hint, OAuth). So I started using QtWebkit, which is fantastic by the way. The only hitch is I would like to allow users behind a proxy to use my application.

I have read about the QNetworkProxy class in the QtNetwork package and figure it should do the trick. The only problem is when I create and apply the proxy, it works just fine over HTTP, but when I pass it a HTTPS (SSL) URL, it gives me the following errors:

QSslSocket: cannot call unresolved function SSLv3_client_method
QSslSocket: cannot call unresolved function SSL_CTX_new
QSslSocket: cannot call unresolved function SSL_library_init
QSslSocket: cannot call unresolved function ERR_get_error
QSslSocket: cannot call unresolved function ERR_error_string

Note: when I run…

QtNetwork.QSslSocket.supportsSsl()

.. it returns false. So that’s proof of my problem.

Here’s my main code (it’s right before my creationg of my QApplication):

proxy = QtNetwork.QNetworkProxy()
proxy.setType(QtNetwork.QNetworkProxy.Socks5Proxy)
proxy.setHostName('localhost');
proxy.setPort(1337)
QtNetwork.QNetworkProxy.setApplicationProxy(proxy);

I got the code from here but the example was written in C++, not Python so I’m not quite sure if I translated it properly. That could be the problem.

EDIT: I’ve tried it over a SOCKS5 and an HTTP proxy and they both throw the same error.

Answer 1

I was working on Windows XP (32-bit) with Python 2.6 and PyQt 4.7.4. The reason that…

QtNetwork.QSslSocket.supportsSsl()

was returning false was because I had not installed OpenSSL binaries to my system.

To solve the problem I went here to download the binaries. Before they would properly install I had to also get the Visual C++ 2008 Redistributables install from Microsoft.

Everything is working great now!