How to use PHP and Youpai Cloud API to implement dynamic refresh and prefetch functions of CDN cache

How to use PHP and Youpai Cloud API to implement the dynamic refresh and prefetch functions of CDN cache

Overview
CDN (Content Distribution Network) is a way to achieve off-site services by deploying servers at the edge of the network. Technology to distribute content closer to users and improve website access speed. Youpaiyun is a cloud computing service provider that provides comprehensive cloud storage and CDN acceleration services. By combining PHP and Youpai Cloud API, we can implement dynamic refresh and prefetch functions to improve the immediacy and cache hit rate when website content is updated.

Dynamic refresh
Dynamic refresh means sending cache refresh instructions to the CDN service provider through API requests to achieve the purpose of immediately refreshing the cache.

First, you need to prepare a Youpaiyun account and obtain the following information:

1. Domain name acceleration area (such as mainland China);
2. Access point Address (for example: http://v0.api.upyun.com);
3. Operator account and password.

Next, we can use PHP to integrate dynamic refresh functionality into our website code. The following is a simple sample code:

<?php

// 准备又拍云API相关信息
$serviceUrl = 'http://v0.api.upyun.com';
$operatorName = 'your_operator_name';
$operatorPassword = 'your_operator_password';

// 准备需要刷新的URL列表，可根据实际情况进行替换
$urls = [
    'http://www.example.com/image1.jpg',
    'http://www.example.com/image2.jpg',
    'http://www.example.com/page1.html',
    'http://www.example.com/style.css',
];

$data = [
    'purge' => $urls,
];

$jsonData = json_encode($data);

// 发送HTTP POST请求
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $serviceUrl . '/purge');
curl_setopt($ch, CURLOPT_USERPWD, $operatorName . ':' . $operatorPassword);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);

$response = curl_exec($ch);
curl_close($ch);

// 处理结果
$result = json_decode($response, true);
if ($result['code'] === 200) {
    echo '刷新成功';
} else {
    echo '刷新失败';
}

?>

In the above code, we use the cURL library to send an HTTP POST request to the refresh interface (/purge) of Youpai Cloud API, passing the URL list data and user operations. username and password. The data returned by the request is in JSON format, in which the code field indicates the status code of the request execution result.

Prefetching
Prefetching refers to caching content to the CDN node in advance before actual user access to achieve faster response speed.

The preparation work is the same as dynamic refresh. Next, we integrate the prefetch function into the PHP code. The following is a simple sample code:

<?php

// 准备又拍云API相关信息
$serviceUrl = 'http://v0.api.upyun.com';
$operatorName = 'your_operator_name';
$operatorPassword = 'your_operator_password';

// 准备需要预取的URL列表，可根据实际情况进行替换
$urls = [
    'http://www.example.com/image1.jpg',
    'http://www.example.com/image2.jpg',
    'http://www.example.com/page1.html',
    'http://www.example.com/style.css',
];

$data = [
    'prefetch' => $urls,
];

$jsonData = json_encode($data);

// 发送HTTP POST请求
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $serviceUrl . '/prefetch');
curl_setopt($ch, CURLOPT_USERPWD, $operatorName . ':' . $operatorPassword);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);

$response = curl_exec($ch);
curl_close($ch);

// 处理结果
$result = json_decode($response, true);
if ($result['code'] === 200) {
    echo '预取成功';
} else {
    echo '预取失败';
}

?>

The above code is similar to the dynamic refresh code, except that the requested API interface is different (/prefetch) and the data passed is also different (prefetch field) .

Note:

• The prefetch operation does not take effect immediately, and the specific effective time may be delayed;
• Within a certain period, the same URL May be consolidated into one request for processing to reduce server resource consumption.

Conclusion
Through the above code examples, we can see how to use PHP and Youpai Cloud API to implement the dynamic refresh and prefetch functions of CDN cache. These features allow our website content to be quickly updated to CDN nodes when changes occur, and load faster when users visit and improve user experience. By flexibly utilizing CDN's cache refresh and prefetch functions, we can give full play to CDN's acceleration advantages and provide users with a better access experience.

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