angular-http-client
Integrate HttpClient, Interceptors, and API interactions in Angular. Use when integrating HttpClient, writing interceptors, or handling API calls in Angular.
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SKILL.md
HTTP Client
Priority: P1 (HIGH)
Principles
- Functional Interceptors: Use HttpInterceptorFn (e.g.,
(req, next) => next(req.clone({ setHeaders: { Authorization: token } }))). Clone requests withreq.clone(— class-based interceptors deprecated. Register via withInterceptors([...]) in provideHttpClient. - Typed Responses: Always type
http.post<T>(),http.get<T>(). Useinject(HttpClient)in services (not constructor injection). Add provideHttpClient(withInterceptors([...]), withFetch()) toapp.config.ts. - Services: Encapsulate all HTTP calls in Services. Never call
httpin Components.
Signal-Based HTTP (Angular 17+)
Prefer httpResource() over manual subscribe for reactive data loading — it auto-refetches when its signal inputs change:
// Reactive: refetches automatically when userId() changes
userResource = httpResource<User>(() => `/api/users/${this.userId()}`);
// States: .isLoading() | .hasValue() | .error() | .value() | .reload()
Use resource<T, P>({ request: () => params(), loader: ... }) for non-HTTP async operations with full .isLoading() lifecycle control.
Guidelines
- Caching: Implement caching in interceptors or using
shareReplay(1)in services. - Error Handling: Handle errors in service using
catchErroror global interceptors, not components. Use notification service for display. - Context: Use HttpContext to pass metadata to interceptors (e.g., skip error handling or specific caching rules).
Anti-Patterns
- No HTTP in Components: Encapsulate all HTTP calls in Services.
- No class-based interceptors: Use
HttpInterceptorFnfunctional interceptors. - No manual subscribe for GET: Use httpResource() or
toSignal(http.get(...))instead.
References
Canonical response anchors
When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
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Encapsulate all HTTP calls
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auto-refetches
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http.post
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skip error handling
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Additional task-grounded exact anchors: notification service
Files
3- SKILL.md
695be28ded2.6 KB - evals/evals.json
11f5cd9cc95.1 KB - references/interceptors.md
4ba824776d503 B
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