HttpClient huwa servizz integrat ta' Angular għal tagħmel ta' HTTP requests. Jirritorna Observables (mhux Promises), jintegraw ma' operaturi RxJS, u jisportja risposti ttipizzati, interceptors, u handling tal-iżbalji.
{ } ;
{ } ;
({ : })
{
() {}
() {
..<[]>();
}
() {
..<>(, user);
}
() {
..();
}
}
It-tip generiku (<User[]>) jittipaż ir-risposta. Ir-requests huma lazy — ħafif jinjelldu biss meta jiġu subscritti.
ngOnInit() {
this.userService.getUsers().subscribe(users => this.users = users);
}
// or with the async pipe (no manual subscribe/unsubscribe):
users$ = this.userService.getUsers();
// template: <li *ngFor="let u of users$ | async">
import { HttpParams, HttpHeaders } from "@angular/common/http";
this.http.get("/api/users", {
params: new HttpParams().set("page", "1").set("limit", "10"), // ?page=1&limit=10
headers: new HttpHeaders({ Authorization: `Bearer ${token}` }),
});
import { catchError, retry } from "rxjs/operators";
import { of } from "rxjs";
this.http.get<User[]>("/api/users").pipe(
retry(2), // retry failed requests twice
catchError(err => {
console.error(err);
return of([]); // fallback value, keep the stream alive
})
).subscribe(users => this.users = users);
Minħabba li hija Observable-based, tista' tikkomponi retries, fallbacks, timeouts, u transforms b'operaturi.
HTTP interceptors automatically attach auth tokens, log requests,
handle errors globally, or show loading spinners — for ALL requests.
HttpClient huwa kif l-apps ta' Angular jtkellmu mal-backends — ttipizzati, Observable-based, u komposabbli b'RxJS għal retries/fallbacks/transformations.
In-natura ta' Observables tagħha (kontra fetch ta' Promises) tintegrawha mal-bqija ta' Angular (async pipe, operaturi, interceptors).
Il-ħsieb ta' typed requests, għażliet, handling tal-iżbalji, u pairing bl-async pipe jikopri prattikament il-bżonnijiet kollha tal-data-fetching f'Angular.