How to throw an observable error manually?

Question

I am working on an Angular app in which I am making a rest call through HTTP as below:

login(email, password) {
    let headers = new Headers();
    headers.a         


        

Answer 1

if (response.success == 0) {
   throw Observable.throw(response);  
 } 

Edit for rxjs 6:

if (response.success == 0) {
   throw throwError(response);  
 }