Can we use Dgraph golang client with slash graphql?

Users GraphQL
1 
	conn, err := dgo.DialSlashEndpoint("", "")
	if err != nil {
		log.Fatal(err)
	}
	defer conn.Close()
	q := `query{
		queryUser{
		  userName
		}
	  }`
	dgraphClient := dgo.NewDgraphClient(api.NewDgraphClient(conn))
	resp, err := dgraphClient.NewReadOnlyTxn().Query(context.Background(), q)

Can GRPC client be used for graphQL queries as well or this is limited only to DQL?

If not, then, is there any way to pool connection for graphQL queries?

2

No you can’t. If you want to use golang, you should generate graphql client using schema. Best choice is to look at GitHub - Yamashou/gqlgenc: This is Go library for building GraphQL client with gqlgen
You’ll get all queries and mutations according to your schema