How to connect nodejs to the server

Node.js method to connect to the server: Use the net module to connect to the TCP/IP server: import the net module, create a TCP client, set up event listeners, send data, and close the connection. Use the http module to connect to the HTTP server: import the http module, create an HTTP client, set request options, send the request, and set up event listeners. Other connection methods: You can also use the ws module to connect to the WebSocket server, or the mqtt module to connect to the MQTT server.

Node.js steps to connect to the server

In Node.js, you can connect to the server in many ways, the most commonly used method It uses net and http core modules.

Use the net module to connect to the TCP/IP server

1. Import net module: `js
   const net = require('net');

2. Create a TCP client: `js
   const client = net.connect(port, host);

   <code>其中，`port` 是服务器监听的端口，`host` 是服务器的 IP 地址或主机名。</code>

3. Set event listener:`js
   client.on('connect', () = > { / Processing logic when connection is established/ });
   client.on('data', (data) => { / Processing logic when data is received/ });
   client.on('error', (err) => { / Error processing logic/ });

4. Send data to the server: `js
   client.write('data');

5. Close the connection: `js
   client.end();

   <code>
   **使用 `http` 模块连接 HTTP 服务器**</code>

6. Import http module: `js
   const http = require('http ');

7. Create an HTTP client: `js
   const client = http.request(options);

   <code>其中，`options` 是一个包含请求详细信息的对象，包括主机名、端口、路径、HTTP 方法等。</code>

8. Send request:`js
   client.end();

9. Set event listener:`js
   client.on('response', (res) => { / Available processing logic for response data/ });
   client.on('error', (err) => { / Processing logic when errors occur/ });

<code>
**其他连接方法**

* **ws** 模块：用于连接 WebSocket 服务器
* **mqtt** 模块：用于连接 MQTT 服务器</code>

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