Question

我已经在graphql中建立了一个apollo-server-express服务器。我可以使用apollo playground发送请求并获得响应。我在操场上发送的请求是

{
  query: me {username}
}

，我可以在右侧面板上获得预期的响应。但是我很难用apollo-client建立客户。下面是源代码：

const gql = require('graphql-tag');
const ApolloClient = require('apollo-boost').default;
const fetch = require('node-fetch').default;

const client = new ApolloClient({
  uri: 'http://localhost:8000/graphql',
  fetch
});

client
  .query({
    query: gql`
      query me {
        username
      }
    `
  })
  .then(data => console.log(data))
  .catch(error => console.error(error));

运行上述代码时，我收到400错误响应。以下是完整的错误消息。我是graphql的新手，我的代码出什么问题了？

name: 'ServerError',
     response:
      Response {
        size: 0,
        timeout: 0,
        [Symbol(Body internals)]: [Object],
        [Symbol(Response internals)]: [Object] },
     statusCode: 400,
     result: { errors: [Array] } },
  message:
   'Network error: Response not successful: Received status code 400',

如果我将查询更改为query : me {，则会出现以下错误：raphQLError: Syntax Error: Expected {, found : at syntaxError ...

服务器代码为：

const express = require('express');
const { ApolloServer, gql } = require('apollo-server-express');

const app = express();

const schema = gql`
  type Query {
    me: User
  }

  type User {
    username: String!
  }
`;

const resolvers = {
  Query: {
    me: () => {
      return {
        username: 'Robin Wieruch'
      };
    }
  }
};
const server = new ApolloServer({
  typeDefs: schema,
  resolvers,
});

server.applyMiddleware({ app, path: '/graphql' });


app.listen({ port: 8000 }, () => {
  console.log('Apollo Server on http://localhost:8000/graphql');
});

如何在Apollo中创建graphql客户端？

0 个答案: