Python requests报错解决办法：Max retries exceeded with url/Name or service not known

报错一：Max retries exceeded with url

原因：访问URL超过最大连接数，关闭长连接可解决，代码如下

import requests


# 原代码
response = requests.post(url, data=data)


# 修复后代码
# 方案一：设置headers关闭持久链接
headers = {
    'Connection': 'close'
}
response = requests.post(url, data=data, headers=headers)

#方案二：设置Keep-alive = False
s = requests.session()
s.keep_alive = False
s.post(url, data=data)

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报错二：Failed to establish a new connection: [Errno -2] Name or service not known’,)

原因：域名无法访问，经检查CentOS未配置DNS，Linux查看DNS配置命令cat /etc/resolv.conf

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若为以下报错，同时出现上面两个报错，优先检查服务器是否配置DNS，切记！

HTTPConnectionPool(host='url', port=port): Max retries exceeded with url: /path (Caused by NewConnectionError(': Failed to establish a new connection: [Errno -2] Name or service not known',))