Q：

2019-10-20 14:19:50,241 28109 INFO ? werkzeug: 127.0.0.1 - - [20/Oct/2019 14:19:50] "GET /?db=dataforce_v7 HTTP/1.1" 404 -
2019-10-20 14:19:50,242 28109 ERROR ? werkzeug: Error on request:
Traceback (most recent call last):
  File "/Users/a/work_code/my_project/venv/lib/python3.7/site-packages/werkzeug/serving.py", line 205, in run_wsgi
    execute(self.server.app)
  File "/Users/a/work_code/my_project/venv/lib/python3.7/site-packages/werkzeug/serving.py", line 196, in execute
    write(data)
  File "/Users/a/work_code/my_project/venv/lib/python3.7/site-packages/werkzeug/serving.py", line 176, in write
    assert isinstance(data, bytes), 'applications must write bytes'
AssertionError: applications must write bytes

 A：

待解决