The mapping for the request/response is handled through @querymapping annotation at your controller/method. Thus everytime stitching needs to call an endpoint, it has to issue a separate redirect. PERIOD! This is PER DOCUMENTATION! (https://docs.spring.io/spring-graphql/docs/current-SNAPSHOT/api/org/springframework/graphql/data/method/annotation/QueryMapping.html)

You cannot call a schema directly because you would basically be doing a DB call without any security whatsoever. This is why the GraphQL spec has it routed through a controller where it either dynamically generates the endpoints or you create them.