async getGeoTiles(){
  const data = await this.geomService.getPBF('layername',11,585,783);
  // const file = createReadStream(join(stringdata, 'package.json'));
  // return 
  // new StreamableFile(file);
  return stringdata;
}```
And in my service:
在我的服务中：
```async getPBF (layername, z, x, y){
// just using a json route in order to test any file
    return this.httpService
    //here should be this URL, but for testing reasons
    //http:XXX.XXX.XXX.XXX/geometrictiles/${source.layername}/{z}/{x}/{y}.pbf
    .get('https://api.coindesk.com/v1/bpi/currentprice.json')
    .pipe(
      map((res) => {
        // console.log('res', res);
        return res.data;
      })
    )
    .pipe(
      catchError(() => {
        throw new ForbiddenException('API not available');
      }),
    );
  }```
But this is not returning the file json, csv nor PBF as I need.
但这不返回我需要的json、csv或PBF文件。
How is this is done?
这应该如何完成？
<details>
<summary>英文:</summary>
I am trying to get a .pbf file from a map server. (but the question expands to pdf, jpg or csv) 
I wanna obtain that .pbf file and return it in a GET request. 
The file comes from a private server: `http:XXX.XXX.XXX.XXX/geometrictiles/${source.layername}/{z}/{x}/{y}.pbf`
And want to return the exact same file to a get API in mi backend, like:
`http://localhost:3001/geometrictiles/${source.layername}/{z}/{x}/{y}.pbf`
So to use my backend as a bridge between mi react app, and the geometrictiles server. 
I generated and endpoint in my controller like: 

But this is not returning the file json, csv nor PBF as I need. 
How is this is done? 
</details>
# 答案1
**得分**: 0
To get file using HttpService you should inject response in getGeoTiles method and write result of HttpService GET method to it response. Also, you should write 'Content-Disposition' header to response object.
Here's example of this logic to retrieve file from a specific URL:
```typescript
@Controller()
export class AppController {
  constructor(private readonly httpSerivce: HttpService) {}
  @Get('/geoserver')
  async getGeoTiles(@Res() response: Response) {
    const { data } = await firstValueFrom(
      this.httpSerivce
        .get<ArrayBuffer>('https://api.coindesk.com/v1/bpi/currentprice.json', {
          // get the content as ArrayBuffer
          responseType: 'arraybuffer',
        })
        .pipe(
          catchError(() => {
            throw new ForbiddenException('API not available');
          }),
        ),
    );
    response.setHeader(
      'Content-Disposition',
      // Here write filename instead of 'currentprice.json'
      `attachment; filename=${encodeURI('currentprice.json')}`,
    );
    // write content to response object
    response.write(data);
    // finalize
    response.end();
  }
}