Angular HttpClient Example

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <script type="text/javascript" charset="utf-8">
      window.AngularVersionForThisPlunker = 'latest'
    </script>
    <title>angular playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript

var angularVersion;
if(window.AngularVersionForThisPlunker === 'latest'){
  angularVersion = ''; //picks up latest
}
else {
  angularVersion = '@' + window.AngularVersionForThisPlunker;
}

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    '@angular/core': 'npm:@angular/core'+ angularVersion + '/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common' + angularVersion + '/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler' + angularVersion  + '/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic.umd.js',
    
    //Added for HttpClient Module
    '@angular/common/http': 'npm:@angular/common' + angularVersion + '/bundles/common-http.umd.js',
    
    '@angular/router': 'npm:@angular/router' + angularVersion +'/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms' + angularVersion + '/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations' + angularVersion + '/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations' + angularVersion + '/bundles/animations-browser.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core' + angularVersion + '/bundles/core-testing.umd.js',
    
    '@angular/common/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler' + angularVersion + '/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http' + angularVersion + '/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router' + angularVersion + '/bundles/router-testing.umd.js',
    'tslib': 'npm:tslib@1.6.1',
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app.module';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, OnInit} from '@angular/core';
import {HttpClient} from '@angular/common/http';

@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>Experiments in HttpClient</h2>
      <h3>One</h3>
      <p>{{head1 | json}}</p>
      <p>{{body1.length}} Length</p>
      <h3>Two</h3>
      <div *ngIf="head2">
        <p>content-type: {{head2.get('content-type')}}</p>
        <p>www-authenticate: {{head2.get('www-authenticate')}}</p>
        <p>{{head2 | json}}</p>
      </div>
      <div *ngIf="body2">
        <p>{{body2.length}} Length</p>
      </div>
    </div>
  `,
})
export class App implements OnInit{
  head1;
  body1=[];
  head2;
  body2;
  
  
  constructor(private http: HttpClient) {
  }
  
  ngOnInit() : void{
    this.getData('https://jsonplaceholder.typicode.com/comments', 'head1', "body1");
    this.getData('https://api.spotify.com/v1/artists', 'head2', "body2"); 
  }
    
    getData(uri: string, head:string, body:string){
    this.http.get<any>(uri).subscribe(
      data => {
        this[body] = data;
        console.log(data);
      },
      (err:HttpErrorResponse) => {
        if(err.error instanceof Error){
          console.log("Client side error");
        }
        else{
          console.log("Sever side error");
          console.log(err.headers);
          console.log(err.headers.get('www-authenticate'));
          console.log(err.headers.get('content-type'));
          this[head] = err.headers;
        }
      });
      
    }
   

}

import {NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';

import {HttpClientModule} from '@angular/common/http';


import {App} from './app';

@NgModule({
  imports: [ BrowserModule, HttpClientModule],
  declarations: [ App ],
  bootstrap: [ App ]
})
export class AppModule {}