Absinthe.GraphqlWS.Transport.handle_subscribe

You're seeing just the function handle_subscribe, go back to Absinthe.GraphqlWS.Transport module for more information.
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handle_subscribe(payload, id, socket)

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Subscribe messages in graphql-ws may include a subscription, implying a subscription to a long term stream of data. These messages may also be queries or mutations, so do not require a stream.