ImportError: HeadersLike

[CyrilWaechter]

Hi,

Apparently following import doesn't work anymore in fresh version of websockets:
Code:

from gql.transport.websockets import WebsocketsTransport

Error:

ImportError                               Traceback (most recent call last)
<ipython-input-2-23957554be23> in <module>
----> 1 from gql.transport.websockets import WebsocketsTransport

/usr/lib/python3.9/site-packages/gql/transport/websockets.py in <module>
      9 from websockets.client import WebSocketClientProtocol
     10 from websockets.exceptions import ConnectionClosed
---> 11 from websockets.http import HeadersLike
     12 from websockets.typing import Data, Subprotocol
     13 

ImportError: cannot import name 'HeadersLike' from 'websockets.http' (/usr/lib/python3.9/site-packages/websockets/http.py)

It looks like HeadersLike are now in websockets.datastructures

[leszekhanusz]

Thanks for the report I'll bump websockets version soon.

Anyway it should not be a bug now as gql is now requiring a version of websockets < 9
In setup.py:

install_websockets_requires = [                                                                                         
    "websockets>=8.1,<9",                                                                                               
]

[leszekhanusz]

This was not the only change needed.
See #214