feat(connect): add "echo" middleware

Author: azu

SUMMARY.md

@@ -4,4 +4,5 @@
 * [Introduction](ja/introduction/README.md)
 * [jQuery](ja/jQuery/README.md)
 * [ESLint](ja/ESLint/README.md)
+* [connect](ja/connect/README.md)
 

ja/connect/README.md

@@ -9,4 +9,7 @@ _middleware_という拡張する仕組みを持っていて、connectが持つ
 
 ## どう書ける?
 
+Connectを使った簡単なEchoサーバを書いてみましょう。
+Echoサーバとは、送られてきたリクエストの内容をそのままレスポンスとして返すサーバのことです。
+
 [import, connect-inline-example.js](../../src/connect/connect-inline-example.js)

src/connect/connect-inline-example.js

@@ -1,8 +1,13 @@
 "use strict";
-import assert from "assert";
 import connect from "connect";
 import http from "http";
 var app = connect();
+// add Error handling
+app.use(function (err, req, res, next) {
+    console.error(err.stack);
+    res.status(500).send(err.message);
+    next();
+});
 // add "X-Content-Type-Options" to response
 app.use(function (req, res, next) {
     res.setHeader("X-Content-Type-Options", "nosniff");

src/connect/echo.js

@@ -0,0 +1,6 @@
+"use strict";
+export default function () {
+    return function (req, res) {
+        req.pipe(res);
+    };
+}

src/connect/hello.js

@@ -1,4 +1,3 @@
-// LICENSE : MIT
 "use strict";
 export default function (text) {
     return function (req, res) {

test/connect/hello-test.js

@@ -5,6 +5,7 @@ import connect from "connect";
 import errorHandler from "../../src/connect/errorHandler";
 import nosniff from "../../src/connect/nosniff";
 import hello from "../../src/connect/hello";
+import echo from "../../src/connect/echo";
 import http from "http";
 import fetch from "node-fetch";
 describe("connect", function () {
@@ -66,4 +67,32 @@ describe("connect", function () {
                 });
         });
     });
+    describe("echo", function () {
+        beforeEach(function (done) {
+            var app = connect();
+            app.use(echo());
+            server = http.createServer(app).listen(3000, done);
+        });
+        afterEach(function () {
+            server && server.close();
+        });
+        it("should return request as response", function () {
+            var requestBody = {
+                name: "Hubot",
+                login: "hubot"
+            };
+            return fetch("http://localhost:3000", {
+                method: "POST",
+                headers: {
+                    "Accept": "application/json",
+                    "Content-Type": "application/json"
+                },
+                body: JSON.stringify(requestBody)
+            }).then(res => {
+                return res.json();
+            }).then(json => {
+                assert.deepEqual(json, requestBody);
+            });
+        });
+    });
 });