Use %20 instead of + for space in python query parameters

To follow up on @WeaselFox’s answer, they introduced a patch that accepts a quote_via keyword argument to urllib.parse.urlencode. Now you could do this:

import requests
import urllib

payload = {'key1': 'value  1', 'key2': 'value 2'}
headers = {'Content-Type': 'application/json;charset=UTF-8'}
params = urllib.parse.urlencode(payload, quote_via=urllib.parse.quote)
r = requests.get("http://example.com/service", params=params, headers=headers,
    auth=("admin", "password"))