docs: public HttpRequest form(String name, Resource resource) {
  		if (null != resource) {
  			if (false == isKeepAlive()) {
  				keepAlive(true);
  			}
  
  			if (null == this.fileForm) {
  				fileForm = new HashMap<>();
  			}
  			// 文件对象
  			this.fileForm.put(name, resource);
  		}
  		return this;
  	}