The Angular 10 HTTP request interval is not functioning as expected

I am currently working on Angular 10 and implementing a feature that checks connectivity by sending a request to the server every 5 seconds.

The issue I'm facing is that the request does not seem to be sent out; instead, it just logs a console.warn message every 5 seconds.

This problem only occurs when the response from the server is a status 200. Strangely, if the response is status 404, everything works fine. Once a status 200 response is received, no more HTTP requests are sent every 5 seconds and only the previous data is printed out.

PS: This issue is being tested on a localhost server.

Below is my code snippet:

checkConnection(): Subscription {
    return interval(2000)
      .subscribe(
        x => {
          this.httpService.testConnectivity().subscribe(
            data => console.warn(`Success: ${data}`),
            error => console.warn(`Error: ${error}`),
            () => console.warn("Completed")
          )
        }
      );
}

The testConnectivity function is as follows:

testConnectivity(): Observable<any> {
    if (isPlatformBrowser(this.platformId)) {
      return this.http
        .get(`${this.url}/api/testconnection`, { observe: 'response' })
        .pipe(
          catchError(this.handleError)
        );
    }
  }

Answer №1

The issue has been discovered. It appears that the browser had cached the HTTP request.

To ensure a fresh request, just include ?x with a unique number after the URL (example:

http://localhost:3000/api/testconnection?0
) for each request.

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