如何调用外部HTML Angular 7+ Net Core？

<iframe [src]="'path/to/external/file.html'"></iframe>

import { HttpClient } from '@angular/common/http';

@Component({
  // 组件配置
})
export class ExternalHtmlComponent implements OnInit {
  externalHtml: string;

  constructor(private http: HttpClient) { }

  ngOnInit() {
    this.http.get('path/to/external/file.html', { responseType: 'text' })
      .subscribe((html: string) => {
        this.externalHtml = html;
      });
  }
}

app.UseStaticFiles(new StaticFileOptions
{
    FileProvider = new PhysicalFileProvider(Path.Combine(Directory.GetCurrentDirectory(), "path/to/external")),
    RequestPath = "/external"
});

[Route("external/file.html")]
public IActionResult ExternalHtml()
{
    return File("~/path/to/external/file.html", "text/html");
}

import { HttpClient } from '@angular/common/http';

@Component({
  // 组件配置
})
export class ExternalHtmlComponent implements OnInit {
  externalHtml: string;

  constructor(private http: HttpClient) { }

  ngOnInit() {
    this.http.get('https://your-net-core-api/external/file.html', { responseType: 'text' })
      .subscribe((html: string) => {
        this.externalHtml = html;
      });
  }
}