raise MissingSchema( requests.exceptions.MissingSchema: Invalid URL '/services/': No scheme supplied. Perhaps you meant https:///services/?

[jenyinzy]

from requests import Session
from requests.auth import AuthBase, HTTPBasicAuth # or HTTPDigestAuth, or OAuth1, etc.
from zeep import Client
from zeep.transports import Transport

session = Session()
session.auth = HTTPBasicAuth('name', 'pw')
session.verify = False

wsdl_url = 'https://xxxx/xxx_service/services/publish.wsdl'

soap_client = Client(wsdl_url,transport=Transport(session=session))
result = soap_client.service.MethodName('John','businesskey','username','hostname')

ERROR:
raise MissingSchema(
requests.exceptions.MissingSchema: Invalid URL '/services/': No scheme supplied. Perhaps you meant https:///services/?

I can see from log the url was called twice from model.py. first time is the correct url https://xxxx.wsdl. but second time called is change to /services/ only, no idea why.

Any one help? bugging for days