如何在使用石墨烯和flask构建的graphql端点上发出json请求

from flask import Flask, request
from graphene import ObjectType, String, Schema
from graphene.relay import Node
from graphene_sqlalchemy import SQLAlchemyConnectionField, SQLAlchemyObjectType
from flask_graphql import GraphQLView
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'your_database_uri'
db = SQLAlchemy(app)

class User(db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50))
    email = db.Column(db.String(120))

class UserType(SQLAlchemyObjectType):
    class Meta:
        model = User
        interfaces = (Node,)

class Query(ObjectType):
    user = Node.Field(UserType)

schema = Schema(query=Query)

@app.route('/graphql', methods=['POST'])
def graphql():
    data = request.get_json()
    result = schema.execute(data['query'], variables=data.get('variables'))
    return result.to_dict()

app.add_url_rule('/graphql', view_func=GraphQLView.as_view('graphql', schema=schema, graphiql=True))

{
  "query": "{ user(id: 1) { id name email } }"
}