(PHP 5 >= 5.2.0, PHP 7, PECL swoole >= 1.9.0)
Swoole\Http\Request::rawcontent — Get the raw HTTP POST body.
This method is used for the POST data which isn't in the form of `application/x-www-form-urlencoded`.
本函数还未编写文档，仅有参数列表。
此函数没有参数。