I too am getting an empty response with status code 0. It seems my request is timing out, but i do not understand why. I have tried increasing it to 180s, and yet it still times out.
It is a WSDL, and it works fine in SoapUI and Postman. The url however does not work in Google Chrome browser.
If I set the method as GET, i get the same error as in the Google Chrome Browser (500 - internal server error ), If i set the method as POST it times out.
Any suggestions?