How to implement the reverse proxy function in the Workerman document

How to implement the reverse proxy function in the Workerman document requires specific code examples

Introduction:

Workerman is a high-performance PHP multi- The process network communication framework provides rich functions and powerful performance, and is widely used in Web real-time communication, long connection services and other scenarios. Among them, Workerman also supports the reverse proxy function, which can realize load balancing and static resource caching when the server provides external services. This article will introduce how to use Workerman to implement the reverse proxy function and give specific code examples.

Introduction to reverse proxy:

Reverse proxy is an important way to forward requests to the back-end real server. The reverse proxy can hide the IP address of the real server and improve security. , and implement functions such as load balancing and caching. The reverse proxy server receives the client's request, forwards the request to different back-end servers according to the configuration, and returns the response result to the client.

Use Workerman to implement the reverse proxy function:

First you need to install the Workerman framework, which can be installed through Composer.

composer require workerman/workerman

Next create a PHP file (proxy.php) in which we will implement the reverse proxy function.

<?php
require_once __DIR__ . '/vendor/autoload.php';

use WorkermanWorker;
use WorkermanConnectionTcpConnection;

$proxy = new Worker('tcp://0.0.0.0:8080');

$proxy->onConnect = function (TcpConnection $connection) {
    // 获取客户端请求头信息
    $headers = $connection->getHeaders();
    
    // 根据请求头信息设置后端服务器地址
    $backend_server = getBackendServer($headers);
    
    // 创建反向代理连接
    $backend_connection = new TcpConnection($backend_server);
    
    // 将客户端请求转发到后端服务器
    $connection->pipe($backend_connection);
    $backend_connection->pipe($connection);
};

// 启动反向代理服务器
Worker::runAll();

function getBackendServer($headers)
{
    // 根据请求头信息动态设置后端服务器地址
    // 这里可以根据具体业务需求进行灵活配置
    
    // 示例1：负载均衡
    $servers = ['tcp://server1:80', 'tcp://server2:80', 'tcp://server3:80'];
    $backend_server = $servers[array_rand($servers)];
    
    // 示例2：根据请求路径选择服务器
    if (strpos($headers['GET'], '/api1/') !== false) {
        $backend_server = 'tcp://server1:80';
    } elseif (strpos($headers['GET'], '/api2/') !== false) {
        $backend_server = 'tcp://server2:80';
    } elseif (strpos($headers['GET'], '/api3/') !== false) {
        $backend_server = 'tcp://server3:80';
    }
    
    return $backend_server;
}

In the above code, we use Workerman's TcpConnection class to implement the reverse proxy function. First, we connect by listening to port 8080. When a client connects, the onConnect event will be triggered.

In the onConnect event, we obtain the client's request header information and set the backend server address based on the request header information. Two examples of setting the backend server address are given in the sample code: load balancing and server selection based on the request path.

Then, we create a reverse proxy connection (TcpConnection object), forward the client request to the backend server, and return the response result of the backend server to the client. Data transfer can be easily achieved by calling the pipe method.

Finally, we start the reverse proxy server through the Worker::runAll() method.

According to actual needs, the backend server address can be dynamically set according to the request header information to achieve functions such as load balancing and static resource caching.

Summary:

This article introduces how to use Workerman to implement the reverse proxy function and gives specific code examples. Through reverse proxy, we can realize functions such as load balancing and static resource caching when the server provides external services. Taking advantage of Workerman's powerful performance, we can easily implement a high-concurrency, high-performance reverse proxy server. I hope this article will help you understand and implement the reverse proxy function.

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