docs: private void send() throws HttpException {
  		try {
  			if (Method.POST.equals(this.method) || Method.PUT.equals(this.method) || Method.DELETE.equals(this.method) || this.isRest) {
  				if (CollectionUtil.isEmpty(this.fileForm)) {
  					sendFormUrlEncoded();// 普通表单
  				} else {
  					sendMultipart(); // 文件上传表单
  				}
  			} else {
  				this.httpConnection.connect();
  			}
  		} catch (IOException e) {
  			throw new HttpException(e.getMessage(), e);
  		}
  	}