Angular: Issue with HttpGet request resulting in HttpErrorResponse

I'm currently developing a Web Application using Angular and need to send an HttpRequest with a get method to fetch data from my api server.

Below is the code snippet for my http get data client:

import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class DataService {

  constructor(private http: HttpClient) { }

  getData(url: string): Observable<any> {
    console.log("getting data from API with url: " + url);
    return this.http.get(url, { responseType: 'json' });
  }
}

To call this function on a button click, I use the following code:

this.dataService.getData(requestString).subscribe(
      (data: any) => {
        console.log(data);
      });

However, when testing it out, I encounter the error message:

ERROR HttpErrorResponse {headers: HttpHeaders, status: 0, statusText: 'Unknown Error', url: '...', ok: false, …}

Interestingly, when I try the same URL in Postman, it works perfectly fine. Any idea what might be missing or incorrect in my setup?

Answer №1

After some troubleshooting, I was able to identify and solve 2 distinct issues:

  1. The problem stemmed from an incorrect launch.json configuration for Chrome, requiring the addition of the "--disable-web-security" runtime argument:
     {
              "type": "chrome",
              "request": "launch",
              "name": "Launch Chrome against localhost",
              "url": "http://localhost:4200",
              "webRoot": "${workspaceFolder}",
              "runtimeArgs": [
                "--disable-web-security"
              ]
        }
  1. In addition, due to extended response times of my API (approximately 3 minutes), it was necessary to adjust the request timeout accordingly:
    this.http.get(url, { responseType: 'json', headers: new HttpHeaders({ timeout: '300000' }) })

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