//一般可以在一开始就先连接网站。设置自动连接即可 
with RtcHttpClient do
 begin
  AutoConnect := True;
  ServerAddr := 'xxxx.com';
  ServerPort := '80';
  if not RtcHttpClient.isConnected then
   Connect();
 end;

//在 RtcDataRequest 的 DataRequestBeginRequest 事件写上
 procedure RtcDataRequestBeginRequest(Sender: TRtcConnection);
var
  RtcClient:TRtcDataClient absolute Sender;
begin
 with RtcClient do
 begin
  IF Request.Params.Text <> '' THEN
  begin
   Write(Request.Params.Text);
  end
  else
   WriteHeader('');
 end;
end;


//访问网站文件 不需要上面的代码了
 with RtcDataRequest.Request do
 begin
  Close := True;
  Agent := AnsiString('Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36');
  Method:=AnsiString('POST');
  ContentType := AnsiString('application/json');
  FileName:=AnsiString('');
  Host :=AnsiString('');
  Cookie.asString['action'] := action;
  Params.Text := '{}';
 end;

//数据响应
procedure TForm1.RtcDataRequest_DataReceived(Sender: TRtcConnection);
var
 RtcClient:TRtcDataClient absolute Sender;
 ResponseHear, ResponseRead :string;
begin
 //不在主线程内 则同步到主线程去处理。如果有处理到UI的话
 if RtcClient.inMainThread then
 begin
  if RtcClient.Response.Done then
  begin
   //要先赋值到字符串去 不然用utf8解码 中文会有问题。 不能直接这样 ResponseRead := UTF8ToAnsi(RtcClient.Read);
   //虽然上面那样赋值看起来是正确的，但是通过下面的so就不对了。要切记先赋值到字符串去
   ResponseRead := RtcClient.Read;
   //UTF8解码
   ResponseRead := UTF8ToAnsi(ResponseRead);
   ResponseHear := RtcClient.Response.HeaderText;

   cxm_RTCINFO.Lines.Add('Request.Params:BEGIN----');
   cxm_RTCINFO.Lines.Add(RtcClient.Request.Params.Text);
   cxm_RTCINFO.Lines.Add('Request.Params:END----');
   cxm_RTCINFO.Lines.Add('ResponseHear:BEGIN----');
   cxm_RTCINFO.Lines.Add(ResponseHear);
   cxm_RTCINFO.Lines.Add('ResponseHear:END----');
   cxm_RTCINFO.Lines.Add('Red:BEGIN----');
   cxm_RTCINFO.Lines.Add(ResponseRead);
   cxm_RTCINFO.Lines.Add('Red:END----');
  
 end
 else
   RtcClient.Sync(RtcDataRequest_DataReceived);
end;

//退出时 关闭所有连接 这里参考的是rtc自带的demo
RtcHttpClient.DisconnectNow(True);