无法通过file_get_contents获取网址，但在浏览器中它可以正常工作

I get url in json, and try file_get_contents($url), but i have 404 error. If I just copy url in chrome I get 200OK and content. If I copy url to new var - it's works, but in var_dump i see that's same url(signatute is dynamic)

    $resp = json_decode($resp);

    $str1 = 'http://ajillion-customer-files.s3.amazonaws.com/reports/50c1a501266c4e8082ee6c03fc604d8a?Signature=FzYwSIhkGrYxQpmygbkFuXibwa4%3D&Expires=1434359105&AWSAccessKeyId=AKIAJ35DX3F5NPKSAKMQ';
    $str2 = $resp->result_url;


    var_dump($str1);
    var_dump($str2);

    echo "

";

    echo file_get_contents($str1);
    echo "

";
    echo file_get_contents($str2);

    exit;

I need run file_get_contents from json var...