Python异常总结

异常总结

Max retries exceeded with url

HTTPConnectionPool(host='dds.cr.usgs.gov', port=80): Max retries exceeded with url: /ltaauth//sno18/ops/l1/2016/138/037/LC81380372016038LGN00.tar.gz?id=stfb9e0bgrpmc4j9lcg45ikrj1&iid=LC81380372016038LGN00&did=227966479&ver=production (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x105b9d210>: Failed to establish a new connection: [Errno 65] No route to host',))

• 异常原因：
  http/https连接太多没有关闭导致。
• 解决方案
  
  • 增加重试连接次数。
    python
requests.adapters.DEFAULT_RETRIES = 5

  • 关闭多余连接
    python
s = requests.session()
s.keep_alive = False