用CULR向七牛的API上传文件

每次总是invalid multipart format

但是我已经设置了Content-type:multipart/form-data呀

function uploadFile($localPath, $remoteFileName, $headers=array()){

global $conf;

$remoteFileName = trim($remoteFileName,'/');

$policy = array('scope' => $conf['bucket'] . ':' . $remoteFileName, 'deadline' => time() + 3600);

$encodedFlags = encode(json_encode($policy));

$sign = hash_hmac('sha1', $encodedFlags, $conf['sk'], true);

$encodedSign = encode($sign);

$token = $conf['ak'].':'.$encodedSign. ':' . $encodedFlags;

$fields = array(

'token' => $token,

'key' => $remoteFileName,

'file' => '@'.$localPath

);

$curl = Magecho_HttpClient::get();

$curl->setOptions(array('gzip'=>false))->setHeader(array(

'Content-type:multipart/form-data'

))->post($conf['host']['up'] ,$fields);

return $curl->response();

}

function encode($str) {

$find = array('+', '/');

$replace = array('-', '_');

return str_replace($find, $replace, base64_encode($str));

}

$result = uploadFile('pic.jpg',date('Y-m-d-H-i-s').'.jpg');

echo $result;