title: Request-Promise throws "no auth mechanism defined" using async/await
body: <p>I was just trying out async/await with <code>request-promise</code> and ran into this error:</p>
  
  <pre><code>RequestError: Error: no auth mechanism defined
        at new RequestError (node_modules/request-promise-core/lib/errors.js:14:15)
        at Request.plumbing.callback (node_modules/request-promise-core/lib/plumbing.js:87:29)
        at Request.RP$callback [as _callback] (node_modules/request-promise-core/lib/plumbing.js:46:31)
        at self.callback (node_modules/request/request.js:188:22)
        at Auth.onRequest (node_modules/request/lib/auth.js:133:18)
        at Request.auth (node_modules/request/request.js:1360:14)
        at Context.&lt;anonymous&gt; (test/routes.js:37:41)
    From previous event:
        at Request.plumbing.init (node_modules/request-promise-core/lib/plumbing.js:36:28)
        at Request.RP$initInterceptor [as init] (node_modules/request-promise-core/configure/request2.js:41:27)
        at new Request (node_modules/request/request.js:130:8)
        at request (node_modules/request/index.js:54:10)
        at Context.&lt;anonymous&gt; (test/routes.js:37:24)
  </code></pre>
  
  <p>It is an API endpoint that I built recently that's supposed to create a new user in MongoDB. It uses Basic Auth provided by Passport strategy, and I've tested with Postman that it works. I'm not exactly sure why this error is being thrown.</p>
  
  <p>My request code (using Mocha):</p>
  
  <pre><code>it("creates a new user", async () =&gt; {
    const options = {
      method: "POST",
      uri: `http://localhost:${process.env.PORT}/api/users`,
      headers: {
        "User-Agent": "Request-Promise",
        "Content-Type": "application/json"
      },
      body: {
        email: "test@domain.com",
        password: "password",
        firstName: "John",
        lastName: "Smith"
      },
      json: true
    };
    const resp = await request(options).auth(APP_ID, SIGNATURE, false);
    expect(resp).to.be.an("object");
  });
  </code></pre>
  
  <p>Edit: I should probably also add that I'm using node 8.2.1 and npm 5.3.0.</p>