Angular 5 - Node/Express - not able to download pdf - node.js

Question

am trying to download pdf file from local folder that structures like
assets/test.pdf.
server.js
app.get('/ePoint', (req,res)=>{
// some dumb code :P
});
demo.ts
import { HttpClient, HttpHeaders } from '#angular/common/http';
import { Headers } from '#angular/http';
import {Observable} from 'rxjs';
fileDownload() {
const headers = new HttpHeaders();
headers.append('Accept', 'application/pdf');
this._http.get('http://localhost:3000/ePoint', { headers: headers })
.toPromise()
.then(response => this.saveItToClient(response));
}
private saveItToClient(response: any) {
const contentDispositionHeader: string = response.headers.get('Content-Disposition');
const parts: string[] = contentDispositionHeader.split(';');
const filename = parts[1].split('=')[1];
const blob = new Blob([response._body], { type: 'application/pdf' });
saveAs(blob, filename);
}
i dont know where i did mistake. in browser network console. its shows 200 ok. but in normal browser console shows as below attachment
Note: i referred for ts file from here
helps much appreciated

Answer 1

try this...
component.ts
downloadDocument(documentId: string) {
this.downloadDocumentSubscription = this.getService.downloadScannedDocument(documentId).subscribe(
data => {
this.createImageFromBlob(data);
},
error => {
console.log("no image found");
$("#errorModal").modal('show'); //show download err modal
});
}
createImageFromBlob(image: Blob) {
console.log("mylog", image);
if (window.navigator.msSaveOrOpenBlob) // IE10+
window.navigator.msSaveOrOpenBlob(image, "download." + (image.type.substr(image.type.lastIndexOf('/') + 1)));
else {
var url = window.URL.createObjectURL(image);
window.open(url);
}
}
service.ts
downloadScannedDocument(documentId: string): Observable<any> {
let params = new HttpParams();
if (documentTypeParam == false)
params = params.set('onlyActive', 'false');
let fileResult: Observable<any> = this.http.get(`${this.apiBaseUrl}/${documentId}`, { responseType: "blob", params: params });
return fileResult;
}