(PECL pecl_http >= 0.10.0)
HttpResponse::setStream — Set stream
Set the resource to be sent.
Note: 预先计算过或已定义的 ETag 与 Last-Modified 会被重新计算和重新定义。
already opened stream from which the data to send will be read
成功时返回 TRUE， 或者在失败时返回 FALSE.