static public function instance($method = null, $url = null, $data = false, $options = false)
    {
        return new static($method, $url, $data, $options);
    }
static public function instance($method = null, $url = null, $data = false, $options = false)
    {
        return new static($method, $url, $data, $options);
    }
static public function instance ( $ method = null , $ url = null , $ data = false , $ options = false ) { return new static ( $ method , $ url , $ data , $ options ) ; }
http request instance, return HttpRequest object.

@param  mixed  $method if array ['url'=>..., 'data'=>..., 'dataType'=>...]
@param  mixed  $url
@param  mixed  $data
@param  array  $options
@return static
http request instance return HttpRequest object .