requests中headers设置的小坑

headers = {
    "Host": "www.tmkoo.com",
    "Connection": "keep-alive",
    "Content-Length": "50",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
    "Origin": "http://www.tmkoo.com",
    "X-Requested-With": "XMLHttpRequest",
    "User-Agent": "Mozilla/5.0 (X11; CrOS i686 2268.111.0) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/536.11",
    "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8",
    "Accept-Encoding": "gzip, deflate",
    "Accept-Language": "zh-CN,zh;q=0.9"

}

Content-Length的设置太小，可能会产生异常：

raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response',))