title: catch is not working for http.get Angular2
body: <p>I am trying to make an ajax call with Http service, which is working fine.</p>
  
  <p>Now I would like to handle failure cases. Example if we get 404 or any other errors.</p>
  
  <p>I am using the following code.<br/></p>
  
  <pre><code>import {Component,Inject} from '@angular/core';
  import {Http, Response,HTTP_PROVIDERS} from '@angular/http';
  import {DoService} from './service';
  import 'rxjs/Rx';
  import 'rxjs/add/operator/catch';
  
  @Component({
      selector: 'comp-one',
      template: `&lt;h2&gt;My First Angular 2 App&lt;/h2&gt;{{data}}
          &lt;input type="button" (click)="doSomething()" value="Do Http"/&gt;`
  })
  
  export class ComponentOne { 
      constructor(public _http:Http){
      console.log("It is from ComponentOne constructor..");
          this._http = _http;
      }
      data:Object;
      doSomething(){
          console.log("It is from doSomething ComponentOne");
          let temp:any = this._http.get('people.json')//people.json is not exist, intendedly maing any error
       .map(res =&gt; res.json())
          .catch((err:any)=&gt;{ console.log("Something is wrong..")});// If i keep this line i am getting errors like "Argument of type '(err:any) =&gt; void' is not assignable to parameter of type '(err: any, caught: Observable&lt;any&gt;) =&gt; Observable&lt;{}&gt;"
          temp.subscribe(
          (res:any)=&gt; {this.data = res._body; console.log(res)},
          (error:any)=&gt;{ console.log("It isf from error..")},//It is not even getting called this block
          () =&gt; console.log('thire,,,ddjfladjfljasdlfj'));//In one of the forum they suggested to use this 3rd perameter, this is also not working for me.
  
    } 
  
  }
  </code></pre>