In one of my Angular 8 project, there was an API call of type GET, but strangely I was not able to make any call to server and error callback displaying this error:
TypeError: You provided ‘undefined’ where a stream was expected. You can provide an Observable, Promise, Array, or Iterable.
The code causing trouble!
Here I am sharing snippets of code that were causing this issue. In the next section, I will share how it is resolved.
this.http.get('https://www.example.com/api/app/dataset/somedatalist') .subscribe((resp: any) => { console.log(resp); }, err => { console.log(err); });</pre> Just a simple HTTP get a call on the server <h3>How I resolved! this?</h3> This issue was caused due to Interceptors in the applications, so it was resolved by setting <code>'No-Auth'
to'True'
in the request Header as shown below:const reqHeader = new HttpHeaders({ 'Content-Type': 'application/json', 'No-Auth': 'True' }); this.http.get('https://www.example.com/api/app/dataset/somedatalist', { headers: reqHeader }) .subscribe((resp: any) => { console.log(resp); }, err => { console.log(err); });
After setting API call returned success callback.
Category: Angular
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