request: Support HTTP GET for persisted queries

[jeffutter]

Component(s)

router

Is your feature request related to a problem? Please describe.

To facilitate CDN caching, we would like to have support for requesting persisted queries via HTTP Get requests.

Furthermore, some of our existing clients use this scheme and without this ability, a seamless migration to cosmo is not possible.

Describe the solution you'd like

We would like to see something similar to https://graphql.org/learn/serving-over-http/#get-request but supporting persisted queries.

Specifically supporting URLs like: https://domain.com/graphql/persisted_queries/:query_hash with variables as a query argument, the value of which is a JSON encoded map of variables.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

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