Angular 16: How to Prevent Duplicate HTTP Requests on Component Re-init?
I'm facing an issue where my Angular 16 component is making duplicate HTTP requests when it gets re-initialized. The component fetches some data from an API in its `ngOnInit` method, but when navigating back to the component, it triggers the HTTP call again, resulting in multiple requests in quick succession. I've tried debouncing the function, but it doesn't seem to work as expected. Here’s the code snippet for reference: ```typescript import { Component, OnInit, OnDestroy } from '@angular/core'; import { HttpClient } from '@angular/common/http'; import { Subject } from 'rxjs'; import { takeUntil } from 'rxjs/operators'; @Component({ selector: 'app-my-component', templateUrl: './my-component.component.html', }) export class MyComponent implements OnInit, OnDestroy { private destroy$ = new Subject<void>(); data: any; constructor(private http: HttpClient) {} ngOnInit() { this.fetchData(); } fetchData() { this.http.get('https://api.example.com/data') .pipe(takeUntil(this.destroy$)) .subscribe(response => { this.data = response; }); } ngOnDestroy() { this.destroy$.next(); this.destroy$.complete(); } } ``` The issue becomes more pronounced when I navigate back and forth between components using a router. I’ve verified that there are no existing subscriptions persisting, as I’m using `takeUntil` to unsubscribe properly. However, I still see multiple requests in the network tab, which overloads the server and creates inconsistent UI states. I’ve also tried using a service to cache the response, but that hasn’t resolved the duplication issue. Any suggestions on how to effectively prevent this behavior? Do I need to manage the component lifecycle differently, or is there a recommended approach to handle API calls in Angular to avoid such duplication? Any ideas what could be causing this?