code: public InputStream getResponseBodyAsStream() throws HttpException {
      try {
        HttpEntity ent = getResponseEntity();
  
        if (ent == null) {
          return null;
        }
  
        return ent.getContent();
      } catch (Throwable t) {
        throw new HttpException(t.getLocalizedMessage(), t);
      }
    }
docs: Returns the response body of the HTTP method, if any, as an {@link InputStream}.
  If response body is not available, returns <tt>null</tt>
  
  @return InputStream    response body
  @throws HttpException