added more examples

node/koa/index.js

@@ -0,0 +1,31 @@
+const Koa = require('koa');
+
+const app = new Koa();
+const PORT = process.env.PORT || 3000;
+
+// Runtime env vars (read at server startup)
+const RUNTIME_PRIVATE_VAR = process.env.RUNTIME_PRIVATE_VAR || 'default-value';
+const RUNTIME_PUBLIC_VAR = process.env.RUNTIME_PUBLIC_VAR || 'default-value';
+
+console.log('=== Runtime Variables ===');
+console.log('RUNTIME_PRIVATE_VAR:', RUNTIME_PRIVATE_VAR);
+console.log('RUNTIME_PUBLIC_VAR:', RUNTIME_PUBLIC_VAR);
+
+app.use(async (ctx) => {
+  if (ctx.path === '/' && ctx.method === 'GET') {
+    ctx.body = {
+      message: 'Hello from Koa!',
+      runtimePrivateVar: RUNTIME_PRIVATE_VAR,
+      runtimePublicVar: RUNTIME_PUBLIC_VAR,
+    };
+  } else if (ctx.path === '/health' && ctx.method === 'GET') {
+    ctx.body = { status: 'ok' };
+  } else {
+    ctx.status = 404;
+    ctx.body = { error: 'Not found' };
+  }
+});
+
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+});