code: public static function post($url, $options = [])
      {
          $key = is_array($options) ? 'form_params' : 'body';
  
          return self::request('POST', $url, [$key => $options]);
      }
docs: post请求
  @param       $url
  @param array $options
  @return bool|\Psr\Http\Message\StreamInterface
  @throws \GuzzleHttp\Exception\GuzzleException