idhttp登陆网站http/1.1 405异常，有代码，请高手分析

idhttp登陆网站http/1.1 405错误，有代码，请高手分析
环境是D7，用idhttp登陆19楼，报http/1.1 405错误，发的数据包貌似没有错误，想不出原因，请教大家，谢谢


unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, ToolWin, IdCookieManager, IdBaseComponent,
  IdComponent, IdTCPConnection, IdTCPClient, IdHTTP, ExtCtrls;

type
  TForm1 = class(TForm)
  IdHTTP1: TIdHTTP;
  IdCookieManager1: TIdCookieManager;
  ToolBar1: TToolBar;
  LoginBtn: TButton;
  ToolButton1: TToolButton;
  Memo1: TMemo;
  Button1: TButton;
  ToolButton2: TToolButton;
  Timer1: TTimer;
  procedure LoginBtnClick(Sender: TObject);
  procedure IdHTTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode);
  private
  { Private declarations }
  public
  { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.LoginBtnClick(Sender: TObject);
var
  Params:TStrings;
  res:TStringStream;
  Url,Cook_Str:String;
begin
  IdHTTP1.ReadTimeout:= 25000;
  IdHTTP1.Request.Accept:= 'image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*';
  IdHTTP1.Request.AcceptEncoding:= 'gzip, deflate';
  IdHTTP1.Request.AcceptLanguage:= 'zh-cn';
  IdHTTP1.Request.CacheControl:= 'no-cache';
  IdHTTP1.Request.Connection:= 'Keep-Alive';
  IdHTTP1.Request.ContentLength:=144;
  IdHTTP1.Request.ContentType:= 'application/x-www-form-urlencoded';

  Cook_Str:='__utma=92551362.1470865355.1315979220.1315979220.1315979220.1; __utmz=92551362.1315979220.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none);';
  Cook_Str:=Cook_Str+' Hm_lvt_5185a335802fb72073721d2bb161cd94=1315979210890; __utmb=92551362.1.10.1315979220; __utmc=92551362; Hm_lpvt_5185a335802fb72073721d2bb161cd94=1315979220531; cdb_sid=7280dda0956157fb93a80c5b0f690556; BIGipServerforum_web_pool=100729098.20480.0000';
  IdHTTP1.Request.CustomHeaders.Add(Cook_Str);
  IdHTTP1.Request.Host:= 'passport.19lou.com';
  IdHTTP1.Request.Referer:= 'http://hangzhou.19lou.com/';
  IdHTTP1.Request.UserAgent:= 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)';

  Params :=TStringList.Create;
  try
  Params.Append('autoLogin=1');
  Params.Append('eb0478242e3f3dbdbbf7df7566f404c1=d5520ab6f8095f0f72d4847d4b95c633');
  Params.Append('login=?');
  Params.Append('userName=********');
  Params.Append('userPass=********');

  try
  Url := 'http://passport.19lou.com/login/index/t/normal';
  IdHTTP1.HandleRedirects:=True;

  res := TStringStream.Create('');

  IdHTTP1.Post(Url,Params,res);
  UTF8Decode(TStringStream(IdHTTP1.Response.ContentStream).dataString);

  Memo1.Lines.Add(res.DataString);


  except

  end;

  finally
  Params.Free;
  end;


end;

procedure TForm1.IdHTTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode);
begin
  Memo1.Lines.Add('****************************(DEBUG开始)***************************');
  Memo1.Lines.Add('=======(访问页面)=========');
  Memo1.Lines.Add(IdHTTP1.URL.URI);
  Memo1.Lines.Add('=======(页面信息)=========');
  Memo1.Lines.Add(IdHttp1.ResponseText);
  Memo1.Lines.Add('=======(页面反馈)=========');
  Memo1.Lines.Add('-------[发送过去的信息]---------------');