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A close look to Angular's new HttpClient
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Manfred Steyer
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December 09, 2017
Programming
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A close look to Angular's new HttpClient
Presentation from ng-be in December 2017.
Manfred Steyer
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December 09, 2017
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Transcript
A close look to Angular's new HttpClient Manfred Steyer SOFTWAREarchitekt.at
About me … • Manfred Steyer • Angular Workshops and
Consultancy • SOFTWAREarchitekt.at • Google Developer Expert (GDE) Page ▪ 2 Manfred Steyer
In the old days, everything was better ;-)
Just a few examples …
Http in Angular Http (Service) • Angular 2+ • Most
Common Use Cases (80:20 principle) • Experimental • Deprecated with 5.0 HttpClient • Angular 4.3 • A lot of additional features • Full comfort we know from $http
Contents • Short overview of Basics • Custom Data Formats
(Binary, Text) • Progress Information • Interceptors for Extensions • Token-based Security
DEMO
angular-crud
None
Basics
HttpClient HttpClientModule and HttpClient from @angular/common/http let url = 'http://www.angular.at/api/hotel';
let headers = new HttpHeaders() .set('Accept', 'application/json'); let params = new HttpParams() .set('city', this.city); this .http .get<Hotel[]>(url, { headers, params }) .subscribe( hotels => console.debug('hotels', hotels), err => console.error('err', err) );
Getting the full HttpResponse save(entity: HotelBooking): Observable<string> { let url
= […] let headers = […] return this.http .post<HotelBooking>(url, entity, {headers, observe: 'response'}) […] }
Getting the full HttpResponse save(entity: HotelBooking): Observable<string> { let url
= […] let headers = […] return this.http .post<HotelBooking>(url, entity, {headers, observe: 'response'}) .pipe( map((response: HttpResponse<HotelBooking>) => { console.debug('status', response.status); console.debug('body', response.body); return response.headers.get('Location'); })); }
Testing
Main Idea: Mock the HttpBackend HttpClientTestingModule Your Code Test HttpClient
HttpBackend Server MockBackend
Testing it('can load hotels by city', () => { let
service: HotelService = TestBed.get(HotelService); let ctrl: HttpTestingController = TestBed.get(HttpTestingController); […] });
Testing it('can load hotels by city', () => { let
service: HotelService = TestBed.get(HotelService); let ctrl: HttpTestingController = TestBed.get(HttpTestingController); service.find({ city: 'Graz' }).subscribe( hotels => expect(hotels.length).toBe(2), err => fail(err) ); […] });
Testing it('can load hotels by city', () => { let
service: HotelService = TestBed.get(HotelService); let ctrl: HttpTestingController = TestBed.get(HttpTestingController); service.find({ city: 'Graz' }).subscribe( hotels => expect(hotels.length).toBe(2), err => fail(err) ); let req = ctrl.expectOne('/hotel?city=Graz'); expect(req.request.method).toBe('GET'); […] });
Testing it('can load hotels by city', () => { let
service: HotelService = TestBed.get(HotelService); let ctrl: HttpTestingController = TestBed.get(HttpTestingController); service.find({ city: 'Graz' }).subscribe( hotels => expect(hotels.length).toBe(2), err => fail(err) ); let req = ctrl.expectOne('/hotel?city=Graz'); expect(req.request.method).toBe('GET'); req.flush([{id: 1, name: 'Hotel Mama'}, {id: 2, name: 'Budget Hotel'}]); ctrl.verify(); });
Custom Data Formats (Text and Binary)
Using XML findById(id: string): Observable<HotelBooking> { […] return this.http .get(url,
{ headers, params, responseType: 'text'}) […] }
Using XML findById(id: string): Observable<HotelBooking> { […] return this.http .get(url,
{ headers, params, responseType: 'text'}) .pipe( switchMap(xmlString => { let observableFactory = bindCallback(parseString); return observableFactory(xmlString, parserOptions); }), map(js => js[1].hotelBooking) ); } import { parseString } from 'xml2js';
DEMO
Interceptors
Idea • Providing a hook • Modify requests and responses
globally • Including Headers, e. g. for Auth. • Parsing Data Formats, like XML • Error Handling • Caching • …
Chain of Responsibility Logic (HttpRequest) Interceptor Interceptor Request Response
DEMO Sending Access Token for Auth Global Error Handler for
Auth
Conclusion observe: response, events, … responseType: text, blob, … Interceptor
Chain The Dark Knight: Best Movie ever!
Contact und Downloads [mail]
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[blog] SOFTWAREarchitekt.at [twitter] ManfredSteyer