I believe credentials can be added to an insecure channel only if the 
channel is local (e.g. UDS). See more details here: 
https://github.com/grpc/grpc/pull/20875

On Tuesday, April 21, 2020 at 2:35:29 PM UTC-7 davidk...@gmail.com wrote:

> I am creating a channel  as follows:
>         call_credentials = grpc.access_token_call_credentials(token)
>         root_credentials = grpc.ssl_channel_credentials(certificate)
>         credentials = grpc.composite_channel_credentials(root_credentials, 
> call_credentials)
>         channel = grpc.secure_channel(endpoint, credentials=credentials)
>
> Suppose I am not using SSL (no certificate), but just an access token, how 
> do I create a channel as above.
> Thanks.
>       
>

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