判断网页能否打开？python

#!/usr/bin/env python
# coding=utf-8
import requests

headers = {
    "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36"}

with open('/Users/b1ancheng/Desktop/123.txt', 'r') as f:
    for line in f:
        line = line.strip('
').strip('ufeff')
        url = 'http://' + line
        print(url)
        try:
            response= requests.get(url, headers=headers, timeout=5).status_code
            print(response)
            if response== 200:
                print('可打开')
            else:
                print(response)
        except Exception as e:
                with open('/Users/b1ancheng/Desktop/1.txt', 'a+') as f1:
                    error = f1.write(line+'
')
                print(e)

 针对批量判断http网站是否打开，如果为https，再跑一次。