Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR

Error screenshot

I am getting this error in my angular project I am using angular version 6 and laravel 5

export class ServicesService {
  baseUrl = 'https://savuk.000webhostapp.com/public/api/';
constructor(private http: HttpClient, private authentication:  ) {
}
getcountries() {
console.log(this.authentication.gettocken());


return this.http.get<any>(this.baseUrl + 'country/all', {
  headers: new HttpHeaders()
    .set('Authorization', 'Bearer ')
});
}
}

this is the service from which api is called

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