New asynchronous HTTP client in PHP8.1

PHP8.1’s new asynchronous HTTP client

With the rapid development of the Internet, the performance of various web applications has become more and more important. In order to provide a better user experience, developers need to use efficient tools and techniques to handle various network requests. Fortunately, PHP8.1 introduces a brand new feature, the asynchronous HTTP client, which allows us to perform HTTP requests in a non-blocking manner, thus improving the performance of the application.

With the asynchronous HTTP client, we can continue to execute other code after sending the request without waiting for the server's response. This non-blocking approach avoids waste of resources and has obvious advantages when handling a large number of requests. Next, I will introduce to you how to use the asynchronous HTTP client of PHP8.1.

First, we need to ensure that PHP8.1 is installed in our development environment. If you haven't installed it yet, please go to PHP's official website (https://www.php.net/downloads) to download the latest version and follow the instructions to install it.

In PHP8.1, we use the HttpClient class to implement asynchronous HTTP requests. Here is a simple example that demonstrates how to send a GET request using an asynchronous HTTP client:

<?php
use PsrHttpMessageResponseInterface;
use PsrHttpMessageServerRequestInterface;
use SwooleHttpRequest;
use SwooleHttpResponse;
use SwooleHttpServer;

$http = new Server('0.0.0.0', 9501);

$http->on('request', function (ServerRequestInterface $request, ResponseInterface $response) {
    $httpClient = new HttpClient();
    $httpClient->getAsync('http://example.com')->then(
        function (ResponseInterface $result) use ($response) {
            $response->write($result->getBody()->getContents());
            $response->end();
        },
        function (Throwable $exception) use ($response) {
            $response->write('Request failed: ' . $exception->getMessage());
            $response->end();
        }
    );
});

$http->start();

In this example, we create a request event handler in the HTTP server ##HttpClient instance, and call the getAsync method to initiate an asynchronous GET request. If the request is successful, we will handle the response result in the then callback function; if the request fails, we will handle the exception in the catch callback function.

It is worth noting that we use Promise objects to handle the results of asynchronous requests. A Promise object is a special object that represents the final completion or failure status of an asynchronous operation. In this example, we use the

then method to register the callback function when the response is successful, and the catch method to register the callback function when the request fails.

In addition to GET requests, we can also use asynchronous HTTP clients to send other types of requests, such as POST, PUT, DELETE, etc. Below is an example that demonstrates how to send a POST request using an asynchronous HTTP client:

<?php
use PsrHttpMessageResponseInterface;
use PsrHttpMessageServerRequestInterface;
use SwooleHttpRequest;
use SwooleHttpResponse;
use SwooleHttpServer;

$http = new Server('0.0.0.0', 9501);

$http->on('request', function (ServerRequestInterface $request, ResponseInterface $response) {
    $httpClient = new HttpClient();
    $httpClient->postAsync('http://example.com', ['foo' => 'bar'])->then(
        function (ResponseInterface $result) use ($response) {
            $response->write($result->getBody()->getContents());
            $response->end();
        },
        function (Throwable $exception) use ($response) {
            $response->write('Request failed: ' . $exception->getMessage());
            $response->end();
        }
    );
});

$http->start();

In this example, we use the

postAsync method to send an asynchronous POST request and pass the request body data. Similar to the previous example, we handle the response results in the then callback function and handle the exception in the catch callback function.

By using PHP8.1's asynchronous HTTP client, we can handle HTTP requests more efficiently, thereby improving application performance and response speed. Whether handling large numbers of requests or optimizing a single request, the asynchronous HTTP client is an extremely useful tool. Come and try it!

Summary:

The new asynchronous HTTP client in PHP8.1 can perform HTTP requests in a non-blocking manner to improve application performance.
• Use the
• HttpClient class to perform asynchronous HTTP requests. You can send GET, POST and other types of requests.
Use Promise objects to handle the results of asynchronous requests, and handle success or failure in the form of callback functions.

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