cur如何显示验证码

cur怎么显示验证码
要显示的网址为:https://pin.aliyun.com/get_img?sessionid=47b7c5dbac3eb7cf9f678227fadd3e67&identity=taobao.login&type=150_40&_r_=1427727728245

用了一些常规方法代码都不行呢，是不是有些有些参数没有传入呢？有朋友知道的指点下小弟哈

<br />$curl = curl_init();<br />curl_setopt($curl, CURLOPT_URL, 'https://pin.aliyun.com/get_img?sessionid=47b7c5dbac3eb7cf9f678227fadd3e67&identity=taobao.login&type=150_40&_r_=1427727728245'); <br />curl_setopt($curl, CURLOPT_REFERER, '');<br />curl_setopt($curl, CURLOPT_USERAGENT, '');<br />curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); <br />$result = curl_exec($curl);<br />header('Content-type: image/JPEG');<br />echo $result;<br />

------解决思路----------------------

$curl = curl_init();<br />curl_setopt($curl, CURLOPT_URL, 'https://pin.aliyun.com/get_img?sessionid=47b7c5dbac3eb7cf9f678227fadd3e67&identity=taobao.login&type=150_40&_r_=1427727728245'); <br />curl_setopt($curl, CURLOPT_REFERER, ''); //这句可以不要<br />curl_setopt($curl, CURLOPT_USERAGENT, ''); //这句可以不要<br />curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); <br />curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE); //这句一定要，因为是 https<br />curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE); //这句可以不要<br />$result = curl_exec($curl);<br />header('Content-type: image/JPEG'); //这句可以不要<br />echo $result;