TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable

Question

I am trying to map from a service call but getting an error. Looked at subscribe is not defined in angular 2? and it said that in order to subscribe we need to

Answer 1

I have been facing this issue when trying to authenticate a user using JSON Web Token. in my case it's related to authentication interceptor.

Sending a request to authenticate a user doesn't have to provide a token since it doesn't exist yet.

Check that your interceptor include this:

if (req.headers.get('No-Auth') == "True")
            return next.handle(req.clone());

And that you provide {'No-Auth':'True'} to your header's request like this:

  authenticateUser(user): Observable {
    const headers = new HttpHeaders({'No-Auth':'True'});
    headers.append('Content-Type', 'application/json');
    return this.httpClient.post(`${this.apiEndpoint}/auth/authenticate`, user, {headers: headers});
  }