角度如何通过http get方法将图像发送到后端api

我有这种方法可以将图像base64数据发送到后端api,以返回与此图像类似的图像:

getProducts(term = 'filter=', brands: string[] = [], categories: string[]= [], fileTypes: string[]= [], imageUploaded = '',
            pageNumber = 0, pageSize = 3): Observable<PaginatedResult<Product[]>> {
   const paginatedResult: PaginatedResult<Product[]> = new PaginatedResult<Product[]>();
   let params = new HttpParams();
   params = params.append('pageNumber', (pageNumber - 1).toString());
   params = params.append('pageSize', pageSize.toString());
   return this.http.get<Product[]>(this.baseUrl
    + 'publicproducts/GetPublicProducts/' + term + '/' + brands.join('_') + '/' +
     categories.join('_') + '/' + fileTypes.join('_'),
     { observe: 'response', params})
  .pipe(
    map(response => {
      paginatedResult.result = response.body;
      if (response.headers.get('Pagination') != null) {
        paginatedResult.pagination = JSON.parse(response.headers.get('Pagination'));
      }
      return paginatedResult;
    }));
}

我需要知道如何将base64放入http get方法。