add response type

Add response type to swagger check

projects/nshmp-ws/src/app/swagger/app.component.ts

@@ -52,7 +52,9 @@ export class AppComponent implements OnInit {
 
     // Check swagger endpoint first
     this.httpClient
-      .get(url)
+      .get(url, {
+        responseType: 'text',
+      })
       .pipe(
         catchError((error: Error) => {
           this.spinnerRef.close();