httpclient hc=new httpclient();
var postcontent = new FormUrlEncodedContent(new Dictionary<string, string> {
{"subject",""},
{"message",content}
});
var post = await hc.PostAsync(postURI, postcontent);
UTF-8 的 FormUrlEncodedContent 编码
内容为中文
Encoding.GBK 怎么办
httpclient PostAsync 中文编码 GBK