python爬虫 requests异常：requests.exceptions.ConnectionError: HTTPSConnectionPool Max retries exceeded
2018-11-20 13:58
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使用 requests抓取网页时会碰到如下异常：
requests.exceptions.ConnectionError: HTTPSConnectionPool Max retries exceeded
原因
1.http的连接数超过最大限制，默认的情况下连接是Keep-alive的，所以这就导致了服务器保持了太多连接而不能再新建连接。
2.ip被封
3.请求过快
解决
1.在header中不使用持久连接
‘Connection’: ‘close’
或
requests.adapters.DEFAULT_RETRIES = 5
2.若是请求过快，可设置time.sleep
3.使用代理ip
4.Requests请求时有时会请求不到页面，或是请求到空白的页面，超时要重试几次，使用try…except语句
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