Implement a simple proxy server function example
Java Dynamic Agent
If you want to understand Java dynamic agent, you must first understand what an agent is. Friends who are familiar with design patterns must know that among the 23 design patterns summarized by Gof, one An object structural pattern called Proxy. The proxy in dynamic proxy refers to this design pattern.
In my opinion, the so-called proxy mode and the "decoration mode" among the 23 design patterns are the same thing. Among the 23 design patterns, they are regarded as two patterns. There are also some articles on the Internet about the similarities and differences of these two patterns. From the details, it is indeed possible to distinguish the two patterns artificially. However, after abstracting to a certain level, I think these two patterns are not the same. The patterns are exactly the same. Therefore, if you learn the proxy mode, you will also master the decoration mode.
Without further ado, let’s start with code:
var express = require('express'); var request = require('request'); var app = express(); app.use('/', function(req, res) { var url = 'https://www.baidu.com/' + req.url; req.pipe(request(url)).pipe(res); }); app.listen(process.env.PORT || 3000);
With less than 10 lines of code, a simple proxy server function is implemented. Isn't it amazing?
If you are familiar with Node.js, it should be easy to understand these lines of code. First load the express module, which is a popular framework for creating HTTP servers. Then there is request, which encapsulates various methods of HTTP requests, making it very easy to initiate requests. Next, instantiate an express object and set the access route. Finally listen on port 3000.
Look at the effect first. Save the above code to the file proxy.js, and execute it in the path where the file is located:
node proxy.js
Use a browser to open localhost:3000/
The key code is in the routing processing method.
req.pipe(request(url)).pipe(res);
This pipe method is magical. Just like its name (pipeline), it passes the browser's request data to the request client, and then transmits the response data of the target server back to the browser. This code is so concise!
So, how to achieve scientific Internet access? Yes, just run the code on a server that is not blocked by the network and it will be fine. For example, behind this Rendoso www.rendoso.com is a Google agent.
The above is the detailed content of Implement a simple proxy server function example. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Solution: 1. Check the eMule settings to make sure you have entered the correct server address and port number; 2. Check the network connection, make sure the computer is connected to the Internet, and reset the router; 3. Check whether the server is online. If your settings are If there is no problem with the network connection, you need to check whether the server is online; 4. Update the eMule version, visit the eMule official website, and download the latest version of the eMule software; 5. Seek help.

As a LINUX user, we often need to install various software and servers on CentOS. This article will introduce in detail how to install fuse and set up a server on CentOS to help you complete the related operations smoothly. CentOS installation fuseFuse is a user space file system framework that allows unprivileged users to access and operate the file system through a customized file system. Installing fuse on CentOS is very simple, just follow the following steps: 1. Open the terminal and Log in as root user. 2. Use the following command to install the fuse package: ```yuminstallfuse3. Confirm the prompts during the installation process and enter `y` to continue. 4. Installation completed

What should I do if the RPC server is unavailable and cannot be accessed on the desktop? In recent years, computers and the Internet have penetrated into every corner of our lives. As a technology for centralized computing and resource sharing, Remote Procedure Call (RPC) plays a vital role in network communication. However, sometimes we may encounter a situation where the RPC server is unavailable, resulting in the inability to enter the desktop. This article will describe some of the possible causes of this problem and provide solutions. First, we need to understand why the RPC server is unavailable. RPC server is a

In network data transmission, IP proxy servers play an important role, helping users hide their real IP addresses, protect privacy, and improve access speeds. In this article, we will introduce the best practice guide on how to build an IP proxy server with PHP and provide specific code examples. What is an IP proxy server? An IP proxy server is an intermediate server located between the user and the target server. It acts as a transfer station between the user and the target server, forwarding the user's requests and responses. By using an IP proxy server

The role of a DHCP relay is to forward received DHCP packets to another DHCP server on the network, even if the two servers are on different subnets. By using a DHCP relay, you can deploy a centralized DHCP server in the network center and use it to dynamically assign IP addresses to all network subnets/VLANs. Dnsmasq is a commonly used DNS and DHCP protocol server that can be configured as a DHCP relay server to help manage dynamic host configurations in the network. In this article, we will show you how to configure dnsmasq as a DHCP relay server. Content Topics: Network Topology Configuring Static IP Addresses on a DHCP Relay D on a Centralized DHCP Server

What should I do if I can’t enter the game when the epic server is offline? This problem must have been encountered by many friends. When this prompt appears, the genuine game cannot be started. This problem is usually caused by interference from the network and security software. So how should it be solved? The editor of this issue will explain I would like to share the solution with you, I hope today’s software tutorial can help you solve the problem. What to do if the epic server cannot enter the game when it is offline: 1. It may be interfered by security software. Close the game platform and security software and then restart. 2. The second is that the network fluctuates too much. Try restarting the router to see if it works. If the conditions are OK, you can try to use the 5g mobile network to operate. 3. Then there may be more

How to install PHPFFmpeg extension on server? Installing the PHPFFmpeg extension on the server can help us process audio and video files in PHP projects and implement functions such as encoding, decoding, editing, and processing of audio and video files. This article will introduce how to install the PHPFFmpeg extension on the server, as well as specific code examples. First, we need to ensure that PHP and FFmpeg are installed on the server. If FFmpeg is not installed, you can follow the steps below to install FFmpe

JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest
