Node koa服务器实现获取客户端ip

const Koa = require('koa');
const app = new Koa();

// 启用代理信任（如果部署在反向代理后）
app.proxy = true; // 关键！告诉 Koa 信任反向代理的头部

// 其他中间件和路由...

router.get('/get-ip', (ctx) => {
  // 从 X-Forwarded-For 中提取客户端 IP（处理多个代理的情况）
  const forwardedIps = ctx.request.get('X-Forwarded-For') || '';
  const clientIP = forwardedIps.split(',')[0]?.trim() || ctx.ip;

  ctx.body = {
    ip: clientIP
  };
});

const clientIP = ctx.get('X-Real-IP') || forwardedIps.split(',')[0]?.trim() || ctx.ip;

location / {
  proxy_pass http://localhost:3000;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $http_host;
}

const Koa = require('koa');
const Router = require('@koa/router');

const app = new Koa();
const router = new Router();

// 启用代理信任（关键！）
app.proxy = true;

router.get('/get-ip', (ctx) => {
  // 尝试从 X-Forwarded-For 中提取第一个 IP（适用于反向代理）
  const forwardedIps = ctx.get('X-Forwarded-For') || '';
  const clientIP = forwardedIps.split(',')[0]?.trim() || 
                   ctx.get('X-Real-IP') || 
                   ctx.ip;

  ctx.body = {
    ip: clientIP
  };
});

app.use(router.routes());
app.use(router.allowedMethods());

app.listen(3000, () => {
  console.log('Server is running on http://localhost:3000');
});