delphi Post数据到网页

var
  http: TIdHttp;
  sendtoserver: TStringStream;
   str: string; 
begin
  http := TIdHttp.Create();                                       // 创建
  http.HandleRedirects := True;                                   // 允许转头
  http.ReadTimeout := 3000;                                       // 延迟时间
  http.Request.ContentType := 'application/json';                 // 要求格式
  sendtoserver := TStringStream.Create(joserv.AsJSON());
  str := http.Post('http://192.168.1.149/epark/WinData.php', sendtoserver);   // 服务器端
end;