diff --git a/index.d.ts b/index.d.ts
index f2d9195..ed2f348 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -53,6 +53,8 @@ declare module 'pure-http' {
     body?: any;
 
     header(name: string): undefined | string | string[];
+
+    app: IPureHttpServer | IPureHttpSecureServer;
   }
 
   export interface IRequestHttp extends http.IncomingMessage, IRequest {}
@@ -269,9 +271,14 @@ declare module 'pure-http' {
     stale?: boolean;
   }
 
-  export interface IPureHttpServer extends net.Server, IRouter {}
+  export interface ILocals {
+    set(key: string, value: any): this;
+    get<T = any>(key: string): T;
+  }
+
+  export interface IPureHttpServer extends net.Server, IRouter, ILocals {}
 
-  export interface IPureHttpSecureServer extends tls.Server, IRouter {}
+  export interface IPureHttpSecureServer extends tls.Server, IRouter, ILocals {}
 
   export interface IOptions {
     server?: net.Server | tls.Server;
diff --git a/lib/locals.js b/lib/locals.js
new file mode 100644
index 0000000..a10ef3d
--- /dev/null
+++ b/lib/locals.js
@@ -0,0 +1,20 @@
+function set(key, value) {
+  if (!this.locals) {
+    this.locals = {};
+  }
+
+  this.locals[key] = value;
+}
+
+function get(key) {
+  if (!this.locals) {
+    return undefined;
+  }
+
+  return this.locals[key];
+}
+
+module.exports = {
+  set,
+  get,
+};
diff --git a/lib/pure-http.js b/lib/pure-http.js
index 399a840..5a9e0b2 100644
--- a/lib/pure-http.js
+++ b/lib/pure-http.js
@@ -1,12 +1,11 @@
 const http = require('http');
 const https = require('https');
 
+const locals = require('./locals');
 const Router = require('./router');
-const { defineProperty } = require('./utils');
+const { defineGetter } = require('./utils');
 
 function pureHttp(options) {
-  const router = new Router();
-
   const { server: existedServer, views: viewOptions, cache } = options || {};
 
   let server = http.createServer();
@@ -18,7 +17,17 @@ function pureHttp(options) {
     server = existedServer;
   }
 
-  server.get = router.get;
+  const router = new Router();
+
+  server.set = locals.set.bind(server);
+  server.get = function get() {
+    if (arguments.length === 1) {
+      const key = arguments[0];
+      return locals.get.call(server, key);
+    }
+
+    return router.get.apply(router, arguments);
+  };
   server.post = router.post;
   server.put = router.put;
   server.patch = router.patch;
@@ -28,12 +37,18 @@ function pureHttp(options) {
   server.trace = router.trace;
   server.connect = router.connect;
   server.all = router.all;
-
   server.use = router.use;
 
   function requestListener(req, res) {
-    defineProperty(res, 'views', viewOptions);
-    defineProperty(res, 'cache', cache);
+    defineGetter(req, 'app', function () {
+      return server;
+    });
+    defineGetter(res, 'views', function () {
+      return viewOptions;
+    });
+    defineGetter(res, 'cache', function () {
+      return cache;
+    });
 
     return router.lookup(req, res);
   }
diff --git a/tests/locals/index.test.js b/tests/locals/index.test.js
new file mode 100644
index 0000000..e411394
--- /dev/null
+++ b/tests/locals/index.test.js
@@ -0,0 +1,41 @@
+const supertest = require('supertest');
+const pureHttp = require('../..');
+
+describe('configs', () => {
+  it('should set and get configs', async () => {
+    const app = pureHttp();
+    app.set('foo', 'bar');
+    app.set('lorem', 'ipsum');
+
+    app.use((req, res) => {
+      const foo = req.app.get('foo');
+      const lorem = req.app.get('lorem');
+      res.send({
+        foo,
+        lorem,
+      });
+    });
+
+    const request = supertest(app);
+    const res = await request.get('/');
+
+    const expected = {
+      foo: 'bar',
+      lorem: 'ipsum',
+    };
+
+    expect(res.body).toEqual(expected);
+  });
+
+  it('should return undefined if the config is not set', async () => {
+    const app = pureHttp();
+
+    app.use((req, res) => {
+      const foo = req.app.get('foo');
+      res.send(String(foo));
+    });
+
+    const request = supertest(app);
+    await request.get('/').expect(200, 'undefined');
+  });
+});