I found this Cheat Sheet: Writing Python 2-3 compatible code that suggests:

# Python 2 and 3: easiest option
from future.standard_library import install_aliases
install_aliases()

from urllib.parse import urlparse, urlencode
from urllib.request import urlopen, Request
from urllib.error import HTTPError

However, trying that in Cinema 4D threw this error:

ImportError: No module named future.standard_library

Fortunately, there are some alternatives to try, like

# Python 2 and 3: alternative 4
try:
    from urllib.parse import urlparse, urlencode
    from urllib.request import urlopen, Request
    from urllib.error import HTTPError
except ImportError:
    from urlparse import urlparse
    from urllib import urlencode
    from urllib2 import urlopen, Request, HTTPError

From that article: "urllib is the hardest module to use from Python 2/3 compatible code."

Will there be an example of how to do this in the SDK examples on GitHub?