example error running flask-socketio gunicorn

gistfile1.txt

gunicorn -c "python:config.gunicorn" "api:create_app()"
[2016-10-18 14:01:37 -0400] [3654] [INFO] Starting gunicorn 19.6.0
[2016-10-18 14:01:37 -0400] [3654] [INFO] Listening at: http://0.0.0.0:8000 (3654)
[2016-10-18 14:01:37 -0400] [3654] [INFO] Using worker: eventlet
[2016-10-18 14:01:37 -0400] [3657] [INFO] Booting worker with pid: 3657
127.0.0.1 - - [18/Oct/2016:14:01:44 -0400] "GET /api/v1/ HTTP/1.1" 200 3101 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 87173µs
127.0.0.1 - - [18/Oct/2016:14:01:44 -0400] "GET /socket.io/?EIO=3&transport=polling&t=1476813704788-0 HTTP/1.1" 200 119 "http://localhost:8000/api/v1/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 782µs
127.0.0.1 - - [18/Oct/2016:14:01:44 -0400] "POST /socket.io/?EIO=3&transport=polling&t=1476813704809-1&sid=ac7af57072f74aa49d3c92e79bab9f9e HTTP/1.1" 200 2 "http://localhost:8000/api/v1/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 1340µs
127.0.0.1 - - [18/Oct/2016:14:01:44 -0400] "GET /socket.io/?EIO=3&transport=polling&t=1476813704817-2&sid=ac7af57072f74aa49d3c92e79bab9f9e HTTP/1.1" 200 18 "http://localhost:8000/api/v1/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 536µs
127.0.0.1 - - [18/Oct/2016:14:01:44 -0400] "GET /socket.io/?EIO=3&transport=polling&t=1476813704919-3&sid=ac7af57072f74aa49d3c92e79bab9f9e HTTP/1.1" 200 4 "http://localhost:8000/api/v1/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 550µs
127.0.0.1 - - [18/Oct/2016:14:01:55 -0400] "GET /api/v1/ HTTP/1.1" 200 3101 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 1416µs
[2016-10-18 14:01:55 -0400] [3657] [ERROR] Error handling request /socket.io/?EIO=3&transport=websocket&sid=ac7af57072f74aa49d3c92e79bab9f9e
Traceback (most recent call last):
  File "/Users/wizdre/code/envs/fetch_backend_py3/lib/python3.5/site-packages/gunicorn/workers/async.py", line 52, in handle
    self.handle_request(listener_name, req, client, addr)
  File "/Users/wizdre/code/envs/fetch_backend_py3/lib/python3.5/site-packages/gunicorn/workers/async.py", line 112, in handle_request
    resp.close()
  File "/Users/wizdre/code/envs/fetch_backend_py3/lib/python3.5/site-packages/gunicorn/http/wsgi.py", line 418, in close
    self.send_headers()
  File "/Users/wizdre/code/envs/fetch_backend_py3/lib/python3.5/site-packages/gunicorn/http/wsgi.py", line 334, in send_headers
    tosend = self.default_headers()
  File "/Users/wizdre/code/envs/fetch_backend_py3/lib/python3.5/site-packages/gunicorn/http/wsgi.py", line 315, in default_headers
    elif self.should_close():
  File "/Users/wizdre/code/envs/fetch_backend_py3/lib/python3.5/site-packages/gunicorn/http/wsgi.py", line 238, in should_close
    if self.status_code < 200 or self.status_code in (204, 304):
AttributeError: 'Response' object has no attribute 'status_code'
127.0.0.1 - - [18/Oct/2016:14:01:55 -0400] "GET /socket.io/?EIO=3&transport=websocket&sid=ac7af57072f74aa49d3c92e79bab9f9e HTTP/1.1" 500 - "-" "-" in 54641µs
127.0.0.1 - - [18/Oct/2016:14:01:55 -0400] "GET /socket.io/?EIO=3&transport=polling&t=1476813715989-0 HTTP/1.1" 200 119 "http://localhost:8000/api/v1/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 912µs
127.0.0.1 - - [18/Oct/2016:14:01:56 -0400] "POST /socket.io/?EIO=3&transport=polling&t=1476813716010-1&sid=c16aca209fc348e7b6ee10be2c8ef7e3 HTTP/1.1" 200 2 "http://localhost:8000/api/v1/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 1382µs
127.0.0.1 - - [18/Oct/2016:14:01:56 -0400] "GET /socket.io/?EIO=3&transport=polling&t=1476813716028-2&sid=c16aca209fc348e7b6ee10be2c8ef7e3 HTTP/1.1" 200 18 "http://localhost:8000/api/v1/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 793µs
127.0.0.1 - - [18/Oct/2016:14:01:56 -0400] "GET /socket.io/?EIO=3&transport=polling&t=1476813716096-3&sid=c16aca209fc348e7b6ee10be2c8ef7e3 HTTP/1.1" 200 4 "http://localhost:8000/api/v1/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36" in 692µs