How to simulate the behavior of curl_upkeep() in Guzzle

M66 2025-05-31

In PHP, curl_upkeep() is a function that maintains a persistent connection pool to reduce the overhead of connection creation and closing every time a request is initiated. When using Guzzle for HTTP requests, Guzzle itself does not provide a direct curl_upkeep() function, but we can use Guzzle's configuration options and appropriate connection pooling mechanism to simulate this effect. This article will explain how to implement similar functionality in Guzzle.

1. What is curl_upkeep() ?

curl_upkeep() is a function used in PHP's curl extension to maintain a persistent connection, which improves efficiency by reusing open connections. This approach significantly reduces the latency and bandwidth consumption of requests compared to re-establishing the connection with each request.

Guzzle is a powerful HTTP client library that itself supports the management of persistent connections and connection pools, similar to the functionality of curl_upkeep() . We can achieve this by configuring Guzzle's HTTP client.

2. Guzzle's connection pool and persistent connection

In Guzzle, the management of the connection pool is implemented through HandlerStack and CurlMultiHandler . Whenever a request is sent, Guzzle will automatically reuse the existing connection without having to re-establish the connection every time, which is like the function of curl_upkeep() .

In Guzzle, we can control the behavior of the connection pool through max_requests and persistent configurations. These configuration items will allow us to optimize the size of the connection pool, reuse policies, etc. to ensure the efficiency of requests.

3. How to implement curl_upkeep() similar function in Guzzle?

To achieve the effect similar to curl_upkeep() in Guzzle, we need to ensure the following:

Configure the size of the connection pool to ensure that up to multiple connections can be maintained.
Set up connection multiplexing to avoid establishing a new TCP connection every time you request.
Maximize the number of requests so that connections within the connection pool can be reused.

Here is a code example of how to implement these configurations in Guzzle:

 <?php

use GuzzleHttp\Client;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Handler\CurlMultiHandler;

// Create a custom one HandlerStack
$stack = HandlerStack::create(new CurlMultiHandler());

// Configure connection pools and multiplexed connections
$client = new Client([
    'base_uri' => 'https://m66.net',
    'handler' => $stack,
    'timeout'  => 30,  // Set request timeout
    'http_errors' => false, // Disable automatic throwing of errors
    'connect_timeout' => 5, // Set connection timeout
    'max_requests' => 10,  // Keep at most10Concurrent requests
    'persistent' => true   // Enable persistent connections
]);

// send GET ask
$response = $client->request('GET', '/path/to/resource');

// Get the response content
echo $response->getBody();

illustrate:

HandlerStack::create(new CurlMultiHandler()) : This line of code creates a Guzzle client using CurlMultiHandler . CurlMultiHandler supports parallel requests and persistent connections.
'persistent' => true : Enable persistent connection. This way Guzzle reuses existing connections without having to re-establish the connection every time.
'max_requests' => 10 : Set the size of the connection pool to up to 10 concurrent requests.

With these settings, Guzzle automatically manages HTTP connection pools and multiplexes connections for performance.

4. Handle more details on connection pooling

In actual production environment, we need to consider some other factors, such as:

Number of concurrency requests : Ensure that Guzzle can handle concurrent requests and does not exceed the maximum limit of the connection pool.
Error handling : For example, whether automatic retry is required when the request fails.
Delay optimization : If the response time of the request is long, timeout and connect_timeout can be appropriately added.

These configuration items can be adjusted according to actual needs to ensure that your Guzzle requests can run efficiently and stably.

5. Summary

Through Guzzle's connection pooling and persistent connection functions, we can achieve curl_upkeep() -like effects. With proper configuration, the efficiency of requests can be ensured and the overhead of connection creation and destruction can be reduced. Guzzle provides powerful configuration options to manage HTTP connection pools to ensure that our applications remain stable in high concurrency environments.

curl_upkeep