angular-http
ALWAYS use when working with Angular HttpClient, HTTP requests, interceptors, error handling, or API communication in Angular applications.
What this skill does
# @angular/common/http
**Version:** Angular 21 (2025)
**Tags:** HTTP, REST, API, Interceptors
**References:** [HttpClient](https://angular.dev/guide/http) • [API](https://angular.io/api/common/http) • [Interceptors](https://angular.dev/guide/http/interceptors)
## API Changes
This section documents recent version-specific API changes.
- NEW: Functional interceptors — Use `provideHttpClient(withInterceptors([...]))` for modern interceptor setup [source](https://dev.to/cristiansifuentes/angular-20-httpclient-interceptors-functional-predictable-and-powerful-kdf)
- NEW: `withFetch` — Use native fetch API with HttpClient [source](https://angular.dev/guide/http)
- NEW: `withInterceptorsFromDi` — Legacy interceptor support with functional approach
- NEW: HttpContext tokens — Per-request metadata using HttpContextToken
- NEW: `AbortSignal` support — Request cancellation with timeout support
- DEPRECATED: Class-based HttpInterceptor — Migrate to functional interceptors
## Best Practices
- Use functional interceptors
```ts
// ✅ Modern functional interceptor
export const authInterceptor: HttpInterceptorFn = (req, next) => {
const authService = inject(AuthService);
const token = authService.getToken();
if (token) {
const authReq = req.clone({
setHeaders: { Authorization: `Bearer ${token}` }
});
return next(authReq);
}
return next(req);
};
// Register
export const appConfig: ApplicationConfig = {
providers: [
provideHttpClient(withInterceptors([authInterceptor]))
]
};
```
- Use interceptors for cross-cutting concerns — Authentication, logging, error handling
```ts
// Error interceptor with retry
export const errorInterceptor: HttpInterceptorFn = (req, next) => {
return next(req).pipe(
catchError((error: HttpErrorResponse) => {
if (error.status === 401) {
inject(Router).navigate(['/login']);
}
return throwError(() => error);
})
);
};
```
- Use retry with backoff for flaky networks
```ts
import { retry, delay, catchError } from 'rxjs/operators';
http.get('/api/data').pipe(
retry({ count: 3, delay: 1000 })
);
```
- Use HttpContext for per-request flags
```ts
const cacheToken = new HttpContextToken<boolean>(() => false);
export const cacheInterceptor: HttpInterceptorFn = (req, next) => {
if (req.context.get(cacheToken)) {
// Check cache
}
return next(req);
};
// Usage
http.get('/api/data', {
context: new HttpContext().set(cacheToken, true)
});
```
- Use proper typing for HTTP responses
```ts
interface User {
id: number;
name: string;
}
http.get<User>('/api/user/1').subscribe(user => {
console.log(user.name); // TypeScript knows the type
});
```
- Use `observe: 'response'` for full HTTP response
```ts
http.get('/api/data', { observe: 'response' }).subscribe(response => {
console.log(response.headers);
console.log(response.body);
});
```
- Handle errors globally
```ts
@Injectable()
export class GlobalErrorHandler implements ErrorHandler {
handleError(error: Error) {
// Log to error tracking service
console.error(error);
}
}
// Register
provideErrorHandler(GlobalErrorHandler)
```
- Use `withCredentials` for CORS requests
```ts
http.get('/api/data', { withCredentials: true });
```
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