request

app.ts

    this.tramwayApiService.getTeacher()
      .pipe(
        concatMap(
          res => this._httpClient.get<Response>('https://tramway.skyeng.loc/api/file-storage/teachers/profileFilesIsUploaded?teacherId=' + res.data.id)
        )
      ).subscribe(
        response => {
          console.log(response)
        }
      )