Execute Query
Executes a GraphQL query via a GET request.
Per the GraphQL over HTTP spec, GET should only be used for queries,
never mutations.
Query parameters
query
The GraphQL query string to execute.
operationName
The name of the operation to execute.
variables
A JSON-encoded string containing variables for the query.
Response
This endpoint returns an object.
data
The payload returned by the GraphQL execution.
errors
A list of errors that occurred during execution.
extensions
Reserved for implementors to extend the protocol (e.g., tracing data).