The optimization role of curl_upkeep() in the scenario of frequent call to RESTful interface

M66 2025-05-18

In modern web development, especially when it comes to scenarios where RESTful interfaces are called at high frequency, how to improve performance and reduce latency has become the focus of developers. As a commonly used backend development language, PHP's curl function is often used when interacting with the RESTful API. For some high-frequency interface calls, how to improve overall performance by optimizing the processing of requests? This article will explore the role of the curl_upkeep() function and its performance optimizations can be brought about when calling the RESTful interface at high frequency.

What is curl_upkeep()?

First of all, it is necessary to clarify that curl_upkeep() is not a built-in function of PHP, but an encapsulation function that we usually write to optimize the performance of frequent calls to interfaces. Its basic purpose is to reuse the same cURL connection when multiple API calls, avoid frequent establishment and destruction of connections, thereby saving unnecessary time and resource overhead.

Problems when calling RESTful interface at high frequency

When calling the RESTful interface at high frequency, you usually encounter the following performance bottlenecks:

Establish a new TCP connection every request : Each call to the API requires re-establishing the connection, which is more time-consuming for high-frequency requests.
Time delay for connection establishment : DNS resolution, three-way handshake, etc. are required to establish a new connection, which will also lead to certain delays.
Too large amount of concurrency requests : If not optimized, a single PHP script may exhaust system resources due to a large number of concurrent requests, resulting in excessive server load or request timeout.

To reduce these problems, curl_upkeep() adopts long connection and connection multiplexing to significantly improve performance.

How to optimize performance?

Long connection multiplexing <br> In traditional HTTP requests, each request re-establishes the connection, but through the multiplexing of long connections, curl_upkeep() can maintain a continuously valid connection. When multiple requests are sent, the overhead of repeatedly establishing a connection can be avoided, and delays such as DNS resolution and TCP handshake can be reduced.
Reduce connection establishment time <br> In high-frequency requests, if each request needs to establish a connection, the response time will be significantly increased. Using curl_upkeep() can maintain the persistence of the connection, save a lot of time to establish connections, and improve the speed of request response.
Improve concurrency capability
curl_upkeep() will effectively manage multiple concurrent requests, maximize the connection multiplexing of the server, and avoid connection overload problems caused by excessive concurrent requests. By optimizing the use of connection pools, the system can still maintain stable performance under high loads.

Actual code examples

Here is a simple example of optimizing frequent API requests using curl_upkeep() . We will take the requesting interface under the m66.net domain name as an example.

 class CurlUpkeep {
    private $ch;
    private $url;

    // Constructor，initialization cURL connect
    public function __construct($url) {
        $this->url = $url;
        $this->ch = curl_init();
        
        curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($this->ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
        curl_setopt($this->ch, CURLOPT_TIMEOUT, 30);  // Set timeout
    }

    // implement GET ask
    public function get($endpoint) {
        curl_setopt($this->ch, CURLOPT_URL, $this->url . $endpoint);
        $response = curl_exec($this->ch);
        
        if(curl_errno($this->ch)) {
            echo 'Error:' . curl_error($this->ch);
        }

        return $response;
    }

    // Destructor，closure cURL connect
    public function __destruct() {
        curl_close($this->ch);
    }
}

// use curl_upkeep 函数implement频繁的接口ask
$curl = new CurlUpkeep('https://m66.net/api');

// 发送多个ask时，复用connect
$response1 = $curl->get('/endpoint1');
$response2 = $curl->get('/endpoint2');
$response3 = $curl->get('/endpoint3');

// Output response
echo $response1;
echo $response2;
echo $response3;

In this example, we define a CurlUpkeep class that encapsulates the initialization, request execution, and closing procedures of the cURL connection. By calling the get() method, we can reuse the same cURL connection in multiple API requests, thereby reducing the time and resource consumption of connection establishment.

Summarize

By multiplexing cURL connections, the curl_upkeep() function solves the performance bottlenecks that may occur when calling the RESTful interface at high frequency, and improves the overall request response speed and server concurrent processing capabilities. It can avoid the overhead of establishing a new TCP connection every request, reduce connection latency, and significantly improve system performance under high concurrency.

Hope this article helps you understand how to optimize high frequency API request performance. If you encounter problems during the implementation process, please leave a message and communicate.

curl_upkeep