code: public function content ()
  	{
  		$contentType = @$this->header['content-type'];
  
  		$this->deCookie();
  		$this->deUrls();
  
  		switch (strtolower($contentType)) {
  			case "application/x-www-form-urlencoded":
  				parse_str($this->raw_context, $output);
  				$this->body = $output ?: [];
  				break;
  			case "multipart/form-data":
  				$this->multipartFromData();
  				break;
  			default:
  
  				break;
  		}
  
  
  		return $this;
  	}
docs: 格式化payload