# Query: 

curl -X POST http://127.0.0.1:4000/graphql   -H "Content-Type: application/json"   --data '{ 
    "query": "query { usuarios { id nome } }" 
  }'


# Mutation: 

curl -X POST http://127.0.0.1:4000/graphql \
  -H "Content-Type: application/json" \
  --data '{ 
    "query": "mutation { criarUsuario(id: 3, nome: \"Beltrano\") { id nome } }" 
  }'