当Nodejs作为客户端发出请求时，获取Nodejs使用的Ip

const os = require('os');

function getLocalIP() {
    const interfaces = os.networkInterfaces();
    for (let name of Object.keys(interfaces)) {
        for (let iface of interfaces[name]) {
            // 过滤掉非IPv4地址和内部地址（如127.0.0.1）
            if (iface.family === 'IPv4' && !iface.internal) {
                return iface.address;
            }
        }
    }
    return '0.0.0.0'; // 如果没有找到外部IP，则返回默认值
}

console.log(getLocalIP());

const request = require('request');

request.get('http://example.com', function (error, response, body) {
    if (!error && response.statusCode == 200) {
        console.log(response.request.connection.remoteAddress);
    }
});

const axios = require('axios');

axios.get('http://example.com')
    .then(function (response) {
        console.log(response.config.adapter._request.headers['x-forwarded-for'] || response.config.adapter._request.connection.remoteAddress);
    })
    .catch(function (error) {
        console.log(error);
    });