http.go
func (req *Request) ResetBody() {
	req.RemoveMultipartFormFiles()
	req.closeBodyStream()
	if req.body != nil {
		if req.keepBodyBuffer {
			req.body.Reset()
		} else {
			requestBodyPool.Put(req.body)
			req.body = nil
		}
	}
}
func (req *Request) ResetBody() {
	req.RemoveMultipartFormFiles()
	req.closeBodyStream()
	if req.body != nil {
		if req.keepBodyBuffer {
			req.body.Reset()
		} else {
			requestBodyPool.Put(req.body)
			req.body = nil
		}
	}
}
// ResetBody resets request body.