使用requests为什么Connection 也是close
{'Server': 'gunicorn/19.9.0', 'Date': 'Sat, 27 Jul 2019 10:40:22 GMT', 'Connection': 'close', 'Content-Type': 'application/json', 'Content-Length': '23', 'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Credentials': 'true'}
200
