func (r *RequestBody) String() (string, error) {
	data, err := r.Bytes()
	return string(data), err
}
String reads and returns content of request body in string.
package flamego
import (
	"io"
	"net/http"
)
type Request struct {
	*http.Request
}
func (r *Request) Body() *RequestBody {
	return &RequestBody{reader: r.Request.Body}
}
type RequestBody struct {
	reader io.ReadCloser
}
func (r *RequestBody) Bytes() ([]byte, error) {
	return io.ReadAll(r.reader)
}