cURL简单文件上传-417预期失败

也可以使用set opt标头设置进行固定：

curl_setopt($curl,CURLOPT_HTTPHEADER,array("Expect:  "));

http://www.khattam.info/417-expectation-failed-in-php-curl-while-submitting-
multi-part-forms-2011-04-14.html