如何为apollo-server-lambda启用cors

如何解决如何为apollo-server-lambda启用cors

好的，所以我看到了很多关于如何为apollo-express启用cors的答案，但是我还没有真正找到针对apollo-server-lambda的答案。

这是我从chrome中得到的错误：

Access to XMLHttpRequest at 'https://5j3gae3086.execute-api.us-east-2.amazonaws.com/alpha/'
from origin 'http://localhost:4200' has been blocked by CORS policy: Response to preflight
request doesn't pass access control check: The 'Access-Control-Allow-Origin' header
has a value 'https://example.com' that is not equal to the supplied origin.

我不知道如何更改值“ https://example.com”。这是我尝试创建服务器的代码：

const { ApolloServer } = require('apollo-server-lambda')
const typeDefs = require('./schema')
const resolvers = require ('./resolvers')

const server = new ApolloServer({
    typeDefs,resolvers,introspection: true,playground: {
        endpoint: "/alpha/graphql",},});

exports.graphqlHandler = server.createHandler({
    cors: {
        // origin: true,origin: "http://localhost:4200",// <-- This is not changing the header value. Do I need to do it from the frontend?
        credentials: true,});

在这里我还需要做什么？

修改 我不确定这是否相关，但这是我的graphql.module.ts文件。这就是我在前端设置grahql的方式：

import { NgModule } from '@angular/core';
import { APOLLO_OPTIONS } from 'apollo-angular';
import { ApolloClientOptions,InMemoryCache } from '@apollo/client/core';
import { HttpLink } from 'apollo-angular/http';

const uri = 'https://5j3gae3086.execute-api.us-east-2.amazonaws.com/alpha/'; // <-- add the URL of the GraphQL server here
export function createApollo(httpLink: HttpLink): ApolloClientOptions<any> {
  return {
    link: httpLink.create({ uri,// these comments are things that I tried with no luck :(
      // fetchOptions: {
      //   mode: 'no-cors',// },//  headers: {
      // 'Access-Control-Allow-Origin': 'http://localhost:4200',// 'Access-Control-Allow-Methods': 'POST',// 'Access-Control-Allow-Headers': 'application/json'
      // "Access-Control-Allow-Credentials" : true
      // "X-CSrftoken": Cookies.get('csrftoken')
    // },}),cache: new InMemoryCache(),};
}



@NgModule({
  providers: [
    {
      provide: APOLLO_OPTIONS,useFactory: createApollo,deps: [HttpLink],],})
export class GraphQLModule { }

万一有人好奇，我正在使用AWS Api Gateway来使用lambda，但我相信我已经在cors上正确添加了配置。

我对此不知所措。我需要更改什么？

解决方法

按照此处的CORS设置说明，我可以成功地使用apollo-angular返回简单查询的结果。不需要特殊的标题等。

https://www.apollographql.com/docs/apollo-server/deployment/lambda/

// serverless.yml
events:
  - http:
      path: graphql
      method: post
      cors: true
  - http:
      path: graphql
      method: get
      cors: true

// graphql.js
exports.graphqlHandler = server.createHandler({
  cors: {
    origin: '*',credentials: true,},});

// graphql.module.ts
import {NgModule} from '@angular/core';
import {APOLLO_OPTIONS} from 'apollo-angular';
import {ApolloClientOptions,InMemoryCache} from '@apollo/client/core';
import {HttpLink} from 'apollo-angular/http';

const uri = 'https://xxx/dev/graphql';
export function createApollo(httpLink: HttpLink): ApolloClientOptions<any> {
  return {
    link: httpLink.create({uri}),cache: new InMemoryCache(),};
}

@NgModule({
  providers: [
    {
      provide: APOLLO_OPTIONS,useFactory: createApollo,deps: [HttpLink],],})
export class GraphQLModule {}

// In Angular 10
this.apollo
  .watchQuery({
    query: gql`
      {
        users {
          email
        }
      }
    `,})
  .valueChanges.subscribe(result => {
    console.log(result.data);
  });