更新时间:2021-12-02 21:30:08
我认为您应该尝试此
req.Content = new StringContent(rcString, Encoding.UTF8, "application/json");
签出此链接:
如何设置HttpClient请求的Content-Type标头?
删除此行c.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json");
并检查