How can I test that this public PDF exists in Angular?

In Angular 18, I want to return true or false whether a public PDF exist or not. For example, it should return true for : https://sigesbre.brgm.fr/files/fiches/MDO_AgenceEau/MDO_AgenceEau_FRGG015.pdf

My code is the following, but I land in catchError instead of map :

existFile(path: string): Observable<boolean> {
return this.httpClient.get(path, { responseType: 'blob' }).pipe(
map(() => {
console.log('exists', path);
return true;
}),
catchError((e) => {
console.log('does not exist', e);
return of(false);
})
);
}


The error logged in console is :

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