报错

运行子程序(在Zotero中直接运行JavaScript代码)失败。
解析表达式出错。
内部错误 : Response status code does not indicate
 success: 404 (Not Found).
原始表达式：
I/using System.Net.Http.Headers;
var client = new HttpClientO;
var content = new StringContent(iscode);
content.Headers.ContentType = new
MediaTypeHeaderValue("application/javascript");
 var request = new HttpRequestMessage0