The direct access link has data, but CURL GET is blank.

$url='http://114.215.198.210:8081/a...';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 ); // Require the result to be a string and output it to the screen
curl_setopt($ch, CURLOPT_HEADER, 0); // Do not use http header to speed up efficiency
curl_setopt($ch, CURLOPT_TIMEOUT, 15);
echo $output = curl_exec( $ch);
curl_close($ch);

Reply content:

$url='http://114.215.198.210:8081/a...';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 ); // Require the result to be a string and output it to the screen
curl_setopt($ch, CURLOPT_HEADER, 0); // Do not use http header to speed up efficiency
curl_setopt($ch, CURLOPT_TIMEOUT, 15);
echo $output = curl_exec( $ch);
curl_close($ch);

I tried it and it worked fine:

<code>➜  /tmp php test.php
{"status":"0","msg":"操作成功","result":{"locationTimeStamp":1468311789000,"address":"广东省深圳市南山区高新南三道靠近真功夫(南山科技园店)","stepValue":0,"calory":0,"distance":0,"radius":70,"deviceId":"666666666666675","battery":66,"positionType":2,"lat":22.538201,"lng":113.952924},"timestamp":1470463701045}%</code>

test.php is the code you posted:

<code><?php
    $url='http://114.215.198.210:8081/api_v1/holder/getCurrentInfo?currentDate=2015-10-01%2016:10:53&access_token=7ede29d0-bac6-4657-a754-fdfc4801bb72&userId=15820466773&deviceId=666666666666675';
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // 要求结果为字符串且输出到屏幕上
    curl_setopt($ch, CURLOPT_HEADER, 0); // 不要http header 加快效率
    curl_setopt($ch, CURLOPT_TIMEOUT, 15);
    echo $output = curl_exec($ch);
    curl_close($ch);
?></code>