针对对python2.x版本：
import httplib
import requests
httplib.HTTPConnection._http_vsn = 10
httplib.HTTPConnection._http_vsn_str = 'HTTP/1.0'
r = requests.get('http://127.0.0.1:8888/')
针对python3.x版本：
from http import client
import requests
client.HTTPConnection._http_vsn=10
client.HTTPConnection._http_vsn_str='HTTP/1.0'
a=requests.get(''http://127.0.0.1:8888/')
