我的服务基于flask + postgresql + gunicorn + supervisor + nginx
用docker部署的时候，跑完服务，然后访问api，有时会提示错误信息，有时效果很好。
并在 sqlachemy 连接数据库中添加参数'sslmode:disable'。
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/sql/elements.py", line 287, in _execute_on_connection
Return connection._execute_clauseelement(self, multiparams, params)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1107, in _execute_clauseelement
Distilled_params,
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1248, in _execute_context
e, statement, parameters, cursor, context
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1466, in _handle_dbapi_exception
Util.raise_from_cause(sqlalchemy_exception, exc_info)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/util/compat.py", line 383, in raise_from_cause
Reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1244, in _execute_context
Cursor, statement, parameters, context
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 552, in do_execute
Cursor.execute(statement, parameters) …