Having trouble receiving a blob response using HttpClient POST request in Angular 9?

I'm encountering an issue while attempting to receive a zip file as a blob from an HTTP POST request. However, the resolved post method overload is not what I expected.

const options = {
  responseType: 'blob' as const
};
Observable<Blob> blob = this.http.post<Blob>(path, data, options)
  .pipe(
    catchError(this.handleError)
  );

Instead of getting the desired result, it appears that the method always resolves to the alternative post method overload that returns Observable<ArrayBuffer>

If anyone has any insights or solutions for me, I would greatly appreciate the help. My Angular version is ~9.1.1 and I keep receiving 

error TS2769: No overload matches this call.

angulartypescript

Answer №1

After some experimentation, I've discovered the solution to getting this to function properly. Delighted to share!

dataType: 'blob' as 'json'

Answer №2

After some experimentation, I found that by eliminating the generic type declaration from my code, it started working smoothly:

this.http.post(path, data, options)

Upon researching further, I discovered that when specifying an Observable<Blob> as the return type, simply including responseType: 'blob' in the options is sufficient.

For those interested, here is the method definition for reference:

post(url: string, body: any | null, options: {
    headers?: HttpHeaders | {
        [header: string]: string | string[];
    };
    context?: HttpContext;
    observe?: 'body';
    params?: HttpParams | {
        [param: string]: string | number | boolean | ReadonlyArray<string | number | boolean>;
    };
    reportProgress?: boolean;
    responseType: 'blob';
    withCredentials?: boolean;
}): Observable<Blob>;

Answer №3

If you've successfully done it for xls files, why not give a try for zip files as well?

  downloadFile(inputs: className) {
    const headers = new HttpHeaders()
     .set('Accept', 'application/xlsx; charset=utf-8');
    const url = `${this.baseUrl}url/downloadxls`;

    return this.http.post(url, inputs, { headers, observe: 'response', responseType: 'blob' });
  }

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