CURL POST 请求 返回 Length Required

Talk is cheap, show me the code.

@msg7086

<?php
header ("Content-type: text/html; charset=utf-8");

ini_set ('display_errors','on');
error_reporting (E_ALL );

//限制内存占用
ini_set ('memory_limit','10M');



//普通 URL 地址
$url="http://xin123.cc/bbs/book_list.aspx?action=new&siteid=1000";

//签到地址
$qd_url="http://xin123.cc/signin/Signin.aspx?Action=index&Mod=Signin&siteid=1000";


//COOKIE
$cookie = 'sidxin123=6C24EE628EF9AF160_8_68_37964_500100-2-0-0-0-600
';


$data="content=月饼&FaceSelect=1.gif&g=签到";



$ch = curl_init ();
curl_setopt ($ch,CURLOPT_URL,$qd_url );
curl_setopt ($ch,CURLOPT_HEADER,false );
//curl_setopt ($ch,CURLOPT_TIMEOUT,2 );

$header = array (
"Content-length: ".strlen ($data )."
);

curl_setopt ($ch,CURLOPT_HTTPHEADER,$header );
curl_setopt ($ch,CURLOPT_POST,true );
curl_setopt ($ch,CURLOPT_POSTFIELDS,$data );
curl_setopt ($ch,CURLOPT_COOKIE,$cookie );
curl_setopt ($ch,CURLOPT_RETURNTRANSFER,false );
curl_exec ($ch );
curl_close ($ch );

<?php
header ("Content-type: text/html; charset=utf-8");
ini_set ('display_errors','on');
error_reporting (E_ALL );
ini_set ('memory_limit','10M');

$url="http://xin123.cc/bbs/book_list.aspx?action=new&siteid=1000";
$qd_url="http://xin123.cc/signin/Signin.aspx?Action=index&Mod=Signin&siteid=1000";
$cookie = 'sidxin123=6C24EE628EF9AF160_8_68_37964_500100-2-0-0-0-600';
$data="content=月饼&FaceSelect=1.gif&g=签到";

$ch = curl_init ();
curl_setopt ($ch,CURLOPT_URL,$qd_url );
curl_setopt ($ch,CURLOPT_HEADER,true );

curl_setopt ($ch,CURLOPT_POST,true );
curl_setopt ($ch,CURLOPT_POSTFIELDS,$data );
curl_setopt ($ch,CURLOPT_COOKIE,$cookie );
curl_setopt ($ch,CURLOPT_RETURNTRANSFER,false );
curl_exec ($ch );
curl_close ($ch );


以上代码测试得到
HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 11900
Content-Type: text/html; charset=utf-8
Expires: -1
Server: Microsoft-IIS/8.0
X-AspNet-Version: 2.0.50727
Set-Cookie: ASP.NET_SessionId=wk1vytudkv1azf55vjd5cbnj; path=/; HttpOnly
Set-Cookie: GUID=409df51603005952; expires=Thu, 15-Sep-2016 19:00:59 GMT; path=/
X-Powered-By: ASP.NET
Date: Tue, 15 Sep 2015 19:00:59 GMT

（内容略）

于是问题在哪？

@msg7086 奇葩啊， 太奇葩了， 为什么会这么奇葩现在又可以了。