今天要使用友盟的推送API来给我的app进行推送信息，调试了好久，老是返回500错误，最终在友盟的技术人员支持下完成了此操作，在此多谢友盟技术和客服人员。
把发方法和注意事项贴出来供大家参考。
public static void post5()
{
string url = "http://msg.umeng.com/api/send";
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.Method = "POST";
string str = "{\"appKey\":\"***\",\"timestamp\":1415872474403,\"validation_token\":\"***\",\"type\":\"broadcast\",\"payload\":{\"aps\":{ \"alert\":\"xxx\"}},\"policy\":{},\"production_mode\":\"false\",\"description\":\"xxx\"}";
byte[] bs = Encoding.ASCII.GetBytes(str);
request.ContentLength = bs.Length;
using (Stream reqStream = request.GetRequestStream())
{
reqStream.Write(bs, 0, bs.Length);
reqStream.Close();
}
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
HttpStatusCode statusCode = response.StatusCode;
}
注意：传内容时别忘记值得内容加引号，大家在传入appkey timestamp 的时候习惯传参，容易忽略引号。
贴出此列：
{"appKey":"123456","timestamp":1415872474403,"validation_token":"896415454sdfd","type":"broadcast","payload":{"aps":{ "alert":"xxx"}},"policy":{},"production_mode":"false","description":"xxx"}