我正在实施 graphql 登录突变来验证用户登录凭据。Mutation 使用 bcrypt 验证密码,然后向客户端发送一个 cookie,客户端将根据 cookie 是买方用户还是所有者用户呈现用户配置文件)。
GraphQL 登录突变代码:
const Mutation = new GraphQLObjectType({
name: 'Mutation',
fields: {
loginUser: {
type: UserType,
args: {
email: { type: GraphQLString },
password: { type: GraphQLString }
},
resolve: function (parent, args, { req, res }) {
User.findOne({ email: args.email }, (err, user) => {
if (user) {
bcrypt.compare(args.password, user.password).then(isMatch => {
if (isMatch) {
if (!user.owner) {
res.cookie('cookie', "buyer", { maxAge: 900000, httpOnly: false, path: '/' });
} else {
res.cookie('cookie', "owner", { maxAge: 900000, httpOnly: false, path: '/' });
}
return res.status(200).json('Successful login');
} else {
console.log('Incorrect password');
}
});
}
});
}
}
}
});
服务器.js:
app.use("/graphql",
(req, res) => {
return graphqlHTTP({
schema,
graphiql: true,
context: { req, res },
})(req, res);
});
错误信息:
(node:10630) UnhandledPromiseRejectionWarning: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
[0] at ServerResponse.setHeader (_http_outgoing.js:470:11)
[0] at ServerResponse.header (/Users/xxx/xxx/server/node_modules/express/lib/response.js:771:10)
[0] at ServerResponse.append (/Users/xxx/xxx/server/node_modules/express/lib/response.js:732:15)
[0] at ServerResponse.res.cookie (/Users/xxx/xxx/server/node_modules/express/lib/response.js:857:8)
[0] at bcrypt.compare.then.isMatch (/Users/xxx/xxx/server/schema/schema.js:89:41)
我已经对此错误进行了一些研究,但似乎找不到相关的答案。问题似乎在于响应主体多次执行,因此“在将标头发送到客户端后无法设置标头”。由于我同时发送 res.cookie() 和 res.status(200),我该如何解决这个问题?