Github user deejvince commented on the issue:
https://github.com/apache/tinkerpop/pull/929
Hi @JavierGarciaGarcia,
Yes I made it work by using url ws://neptune-endpoint:8182/gremlin
Signing host;x-amz-date
And passing the signature in the Authorization header as well as the
required x-amz-date header to the WebSocket via option.headers.---
