Python爬虫、requests库的get方法，带上headers后出现编码错误

目标网站：知乎
Pyrhon版本：3.6

agent = 'Mozilla/5.0 (Windows NT 6.1; W…) Gecko/20100101 Firefox/59.0'
header = {
    'HOST': 'www.zhihu.com',
    'Referer': 'https://www.zhihu.com',
    'User-Agent': agent
}

response = requests.get('https://www.zhihu.com', headers=header)

报错内容：

 Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Anaconda3\lib\site-packages\requests\api.py", line 72, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Anaconda3\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Anaconda3\lib\site-packages\requests\sessions.py", line 518, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Anaconda3\lib\site-packages\requests\sessions.py", line 639, in send
    r = adapter.send(request, **kwargs)
  File "C:\Anaconda3\lib\site-packages\requests\adapters.py", line 438, in send
    timeout=timeout
  File "C:\Anaconda3\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "C:\Anaconda3\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 356, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "C:\Anaconda3\lib\http\client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "C:\Anaconda3\lib\http\client.py", line 1280, in _send_request
    self.putheader(hdr, value)
  File "C:\Anaconda3\lib\http\client.py", line 1212, in putheader
    values[i] = one_value.encode('latin-1')
UnicodeEncodeError: 'latin-1' codec can't encode character '\u2026' in position 30: ordinal not in range(256)

\u2026好像是空格，看了下源码，好像是空格要转latin-1这种编码失败了，
我上面有空格的是agent，要用来伪装浏览器，这可怎么办，
而且在我看的那个知乎爬虫视频中，他也是有空格的，却不出错，这是我的环境有问题吗，
请大佬们能指点一下

头有问题啊！'Mozilla/5.0 (Windows NT 6.1; W…) Gecko/20100101 Firefox/59.0'不知道怎么会出现...这种符号！自己去复制浏览器的user-agent

你的用户代理agent是用户未登录时的，而下面get的URL是登录后的URL。你先登录知乎，之后重新获得user-agent，就可以了。如果是模拟用户登录，你可以在网上找另外一些资料

agent中的字符串是不是都是ASCII字符。有没有其他字符

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0

Mozilla/5.0 (Windows NT 6.1; W…) Gecko/20100101 Firefox/59.0

在浏览器F12复制时代码没全打开，没复制完全，多了...这个符号，应该是这个导致的编码失败