网络爬虫：urllib模块应用12--err错误处理

def check_urlerror():
    """
    1.没有网络
    2. 服务器连接失败
    3. 找不到指定服务器
    :return:
    """
    url = 'http://www.baiduxxx.com/'
    try:
        req_header = {
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0',
        }
        # 构建一个request对象
        req = request.Request(url, headers=req_header)
        # 根据Request对象发起请求
        response = request.urlopen(req)
        print(response.reason)
    except error.URLError as err:
        print(err.reason)
check_urlerror()

# error.HTTPError:URLError的子类
def check_httperror():
    url = 'https://www.qidian.com/all/nsacnscn.htm'
    try:
        response = request.urlopen(url)
        print(response.status)
    except error.HTTPError as err:
        # HTTPError三个属性
        # 状态码
        print(err.code)
        # 原因
        print(err.reason)
        # 返回响应头
        print(err.headers)
    except error.URLError as err:
        print(err.reason)
check_httperror()