How to include headers in RESTDataSource request?

I’m trying to use apollo RESTDataSource to wrap my rest api. I need to pass some headers to the api call.

I’m following the example from the docs: https://www.apollographql.com/docs/apollo-server/features/data-sources#intercepting-fetches

This is my code:

  willSendRequest(request: RequestOptions) {
    console.log(`request 1: ${JSON.stringify(request)}`);
    request.headers.set('Authorization', this.context.authorization);
    console.log(`request 2: ${JSON.stringify(request)}`);
  }

I’m expecting the headers to contain ‘Authorization’. But it’s always empty.

The log from the above code:

request 1: {"method":"POST","path":"partnerinvoices","body":{"command": "input","params":{},"headers":{}}
request 2: {"method":"POST","path":"partnerinvoices","body":{"command":"input","params":{},"headers":{}}

I can override body and params in willSendRequest method without any problem.

[abernix]

The third option to, e.g. post, put, delete, etc. allows passing of fetch options. For example:

class MoviesAPI extends RESTDataSource {
  constructor() {
    super();
    this.baseURL = 'https://movies-api.example.com/';
  }

  async getMovie(id) {
    return this.get(`movies/${id}`, undefined, {
      headers: {
        'Authorization': 'Bearer 123abc',
      },
    });
  }
}

[shandrolis]

@abernix Thanks for your answer, my code worked after adding undefined to the GET request, but I’m confused that what is undefined in the syntax? Any documentation for reference? Thank you!

Second function param is to add (url)query parameters, so you don’t have to manually add it to the path yourself. Its usage and source can be seen here. I’m not sure if there are extensive official docs on it, but you can quite easily look in the source.