docs: private void sendFormUrlEncoded() throws IOException {
  		if (StrUtil.isBlank(this.header(Header.CONTENT_TYPE))) {
  			// 如果未自定义Content-Type，使用默认的application/x-www-form-urlencoded
  			this.httpConnection.header(Header.CONTENT_TYPE, ContentType.FORM_URLENCODED.toString(this.charset), true);
  		}
  
  		// Write的时候会优先使用body中的内容，write时自动关闭OutputStream
  		if (ArrayUtil.isNotEmpty(this.bodyBytes)) {
  			IoUtil.write(this.httpConnection.getOutputStream(), true, this.bodyBytes);
  		} else {
  			final String content = HttpUtil.toParams(this.form, this.charset);
  			IoUtil.write(this.httpConnection.getOutputStream(), this.charset, true, content);
  		}
  	}