func (h *RequestHeader) SetMethod(method string) {
	h.method = append(h.method[:0], method...)
}
func (h *RequestHeader) SetMethod(method string) {
	h.method = append(h.method[:0], method...)
}
func ( h * RequestHeader ) SetMethod ( method string ) { h . method = append ( h . method [ : 0 ] , method ... ) }
// SetMethod sets HTTP request method.
SetMethod sets HTTP request method .