在aspx页面上执行php curl请求时找不到404

我正在尝试使用PHP curl登录.aspx页面。现在，我正在抓取登录页面以获取VIEWSTATE并编写正确的url来发出请求，之后还有一个提交字段并登录的curl请求。此curl调用返回404错误。我已经尝试用另一个curl发出另一个curl请求，但它会重定向到登录页面。 我哪里错了

    include('../dom/simple_html_dom.php');
    $ckfile = tempnam ("/tmp", "CURLCOOKIE"); 
    $url = 'http://www.EXAMPLE.com/Shop/Login.aspx';

//FIRST CALL TO GRAB THE VIEWSTATE VALUE
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true); // Accepts all CAs 
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_COOKIEJAR, $ckfile);
    curl_setopt($ch, CURLOPT_COOKIEFILE, $ckfile); //Uses cookies from the temp file 
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // Tells cURL to follow redirects 
    $output = curl_exec($ch);

    $html = str_get_html($output);

//GRABBING THE VALUES
    $evttarget  = 'LogonBox%24btnLogin';
    $evtarg     = '';
    $viewstate  = urlencode($html->find('input#__VIEWSTATE')[0]->value);
    $viewgen    = urlencode($html->find('input#__VIEWSTATEGENERATOR')[0]->value);
    $username   = 'MYUSERNAME';
    $password   = 'MYPASSWORD';

//COMPOSING THE URL 
    $url = 'http://www.EXAMPLE.com/Shop/Login.aspx?__EVENTTARGET='.$evttarget.'&__EVENTARGUMENT='.$evtarg.'&__VIEWSTATE='.$viewstate.'&__VIEWSTATEGENERATOR='.$viewgen.'&LogonBox%24txtUsername='.$username.'&LogonBox%24txtPassword='.$password;

//LOGIN REQUEST
    $ch = curl_init();
    print $url;
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true); // Accepts all CAs 
    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_COOKIEJAR, $ckfile);
    curl_setopt($ch, CURLOPT_COOKIEFILE, $ckfile); //Uses cookies from the temp file
    curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)");
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // Tells cURL to follow redirects 
    $output = curl_exec($ch);

THIS RETURNS A 404 ERROR

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我尝试过编写url并将其粘贴到浏览器的地址栏中，它也会返回404错误，因此我认为问题可能与标题有关，对吗？我尝试过编写url并将其粘贴到浏览器的地址栏中，它也会返回404错误，因此我想问题可能与标题有关，我说得对吗？