How Swoole supports asynchronous HTTP/2 connections

HTTP/2 is a new protocol that provides faster speeds and greater performance, making the Web more efficient. In HTTP/2, a single connection can support multiple parallel requests and responses, which is "multiplexing". Swoole is an asynchronous concurrent programming framework based on PHP, which can support asynchronous HTTP/2 connections. This article will introduce how Swoole supports asynchronous HTTP/2 connections.

Asynchronous connection of HTTP/2

HTTP/2 is a protocol completely different from HTTP/1.1. It uses a binary framing mechanism and has great improvements in the use of connections. Variety. In HTTP/1.1, each request requires a TCP connection to be established. In HTTP/2, all requests are made on one TCP connection, which is the multiplexing mechanism. The multiplexing mechanism of HTTP/2 allows the client to send multiple requests at the same time without delay, which reduces network delay and improves performance.

Swoole's asynchronous HTTP/2 connection

Swoole is an asynchronous concurrent programming framework for PHP that can support asynchronous HTTP/2 connections. Swoole's asynchronous HTTP/2 connection is implemented using the underlying nghttp2 library. For the HTTP/2 protocol, Swoole provides support for HTTP/2 clients and HTTP/2 servers.

Swoole's Asynchronous HTTP/2 Server

Swoole provides an implementation of HTTP/2 server. We can easily create an HTTP/2 server and can handle multiple on the same connection. Concurrent requests. In Swoole, we can use the following code to create an HTTP/2 server:

$http = new SwooleHttpServer("127.0.0.1", 9501, SWOOLE_PROCESS, SWOOLE_SOCK_TCP | SWOOLE_SSL);
$http->set([
    'ssl_cert_file' => '/path/to/cert.crt',
    'ssl_key_file' => '/path/to/key.key',
]);
$http->on('Request', function (SwooleHttpRequest $request, SwooleHttpResponse $response) {
    $response->header('Content-Type', 'text/plain');
    $response->end("Hello World
");
});
$http->start();

In this example, we use Swoole to create an HTTP/2 server and listen to the local port 9501. In the HTTP/2 server's event handling, we simply return a "Hello World" string. This HTTP/2 server can handle multiple requests simultaneously and can use a single TCP connection to handle all HTTP/2 requests.

Swoole’s asynchronous HTTP/2 client

Swoole’s HTTP/2 client can send requests to the HTTP/2 server asynchronously, and can receive requests from the HTTP/2 server asynchronously. response. In Swoole, we can use the following code to create an asynchronous HTTP/2 client:

$http2 = new SwooleHttp2Client('www.example.com', 443, true);
$http2->set([
    'ssl_cert_file' => '/path/to/cert.crt',
    'ssl_key_file' => '/path/to/key.key',
]);
$http2->connect(function() use ($http2) {
    $http2->send(1, [
        [":method" => "GET", ":path" => "/"],
    ], '');
});

$http2->recv(1, function($http2, $streamId, $data) {
    echo $data;
    $http2->close();
});

In this example, we use Swoole to create an HTTP/2 client and asynchronously send the request to HTTP/2 The server sent a GET request. When receiving the HTTP/2 server response, we can process the HTTP/2 client response asynchronously. In this way, we can use Swoole's asynchronous programming model to implement efficient HTTP/2 clients.

Summary

Swoole is an asynchronous concurrent programming framework based on PHP, which can support asynchronous HTTP/2 connections. In HTTP/2, a single connection can support multiple concurrent requests and responses, making the Web more efficient and faster. By using Swoole's asynchronous programming model, we can use the HTTP/2 protocol to accelerate our applications, thus improving the performance of our web applications.

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