cors - 在 NestJs 中启用 Cors

Question

我想使用 NestJs api，但我在每个 fetch 中都收到相同的错误消息:

Access to fetch at 'http://localhost:3000/articles' from origin 'http://localhost:4200' has been blocked by CORS policy: 
No 'Access-Control-Allow-Origin' header is present on the requested resource.
If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

我的前端是一个 Angular，我有一个简单的 fetch :

fetch('http://localhost:3000/articles')
    .then((res) => {
      console.log(res);
    });

我在 NestJs 中尝试了这些选项 - 但它们似乎都不起作用:
尝试 A

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  app.enableCors({
    origin: true,
    methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
    allowedHeaders: 'Content-Type, Accept',
  });
  await app.listen(3000);
}
bootstrap();

尝试 B

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  app.enableCors();
  await app.listen(3000);
}
bootstrap();

尝试 C

async function bootstrap() {
  const app = await NestFactory.create(AppModule, {cors: true});
  await app.listen(3000);
}
bootstrap();

Answer 1

在您的 main.ts , 编辑 bootstrap 函数如下启用 CORS

const app = await NestFactory.create(AppModule, { cors: true });

或者

const app = await NestFactory.create(ApplicationModule);
app.enableCors();

此方法可帮助您为 cors 传递额外的参数

阅读更多关于 CORS here