HTTP interceptor dùng khi nào?

Interceptor xử lý cross-cutting concern cho request/response: attach auth token, refresh token, correlation id, logging, retry, error normalization hoặc loading indicator.

Ví dụ functional interceptor:

export const authInterceptor: HttpInterceptorFn = (req, next) => {
  const token = inject(AuthService).token()
  const authReq = req.clone({ setHeaders: { Authorization: `Bearer ${token}` } })

  return next(authReq)
}

provideHttpClient(withInterceptors([authInterceptor]))

Nên giữ interceptor mỏng; business transform để trong API service.

An interceptor handles cross-cutting concerns for requests/responses: attaching auth tokens, refreshing tokens, correlation ids, logging, retry, error normalization or loading indicators.

Example functional interceptor:

export const authInterceptor: HttpInterceptorFn = (req, next) => {
  const token = inject(AuthService).token()
  const authReq = req.clone({ setHeaders: { Authorization: `Bearer ${token}` } })

  return next(authReq)
}

provideHttpClient(withInterceptors([authInterceptor]))

Keep interceptors thin; business transformations belong in API services.