Playground endpoint is not dynamic

[astghikxachatryan]

const url = ${window.location.protocol}//${host}${window.GRAPHQL_ENDPOINT}``

Playground doesn't work on URLs like this https://foo.com/comments/graphiql.
https://foo.com/comments/ is the API getaway URL that routes to our comments service and comments service is based on Mercurius.
In this case code just ignores the part after host(in my case comments)

And playground calls to wrong qraphql url. It calls https://foo.com/graphql instead of https://foo.com/comments/graphql

[Matteo Collina]

Thanks for reporting! Would you like to send a Pull Request to address this issue? Remember to add unit tests.

[Satish Tripathi]

@mcollina we are deploying graphql api and using this package and we are also facing the same issue. I have created the fix . Please review and approve it.