From Node to Connect and Express Server

Node HTTP server

// Require what we need
var http = require("http");

// Build the server
var app = http.createServer(function(request, response) {
  response.writeHead(200, {
    "Content-Type": "text/plain"
  });
  response.end("Hello world!\n");
});

// Start that server, baby
app.listen(1337, "localhost");
console.log("Server running at http://localhost:1337/");

В браузере набрать
localhost:1337
localhost:1337/anime_currency
localhost:1337/?onlyfriend=anime

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The request handler

var app = http.createServer(function(request, response) {

  // Build the answer
  var answer = "";
  answer += "Request URL: " + request.url + "\n";
  answer += "Request type: " + request.method + "\n";
  answer += "Request headers: " + JSON.stringify(request.headers) + "\n";

  // Send answer
  response.writeHead(200, { "Content-Type": "text/plain" });
  response.end(answer);

});


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Add 404 Error page

var http = require("http");

http.createServer(function(req, res) {

  // Homepage
  if (req.url == "/") {
    res.writeHead(200, { "Content-Type": "text/html" });
    res.end("Welcome to the homepage!");
  }

  // About page
  else if (req.url == "/about") {
    res.writeHead(200, { "Content-Type": "text/html" });
    res.end("Welcome to the about page!");
  }

  // 404'd!
  else {
    res.writeHead(404, { "Content-Type": "text/plain" });
    res.end("404 error! File not found.");
  }

}).listen(1337, "localhost");

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Connect

// Require the stuff we need
var connect = require("connect");
var http = require("http");

// Build the app
var app = connect();

// Add some middleware
app.use(function(request, response) {
  response.writeHead(200, { "Content-Type": "text/plain" });
  response.end("Hello world!\n");
});

// Start it up!
http.createServer(app).listen(1337);

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Connect with Middleware

var connect = require("connect");
var http = require("http");
var app = connect();

// Logging middleware
app.use(function(request, response, next) {
  console.log("In comes a " + request.method + " to " + request.url);
  next();
});

// Send "hello world"
app.use(function(request, response) {
  response.writeHead(200, { "Content-Type": "text/plain" });
  response.end("Hello world!\n");
});

http.createServer(app).listen(1337);

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Connect with Logger

var connect = require("connect");
var http = require("http");
var app = connect();

app.use(connect.logger());
// Fun fact: connect.logger() returns a function.

app.use(function(request, response) {
  response.writeHead(200, { "Content-Type": "text/plain" });
  response.end("Hello world!\n");
});

http.createServer(app).listen(1337);

Перейти в браузере на localhost:1337

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Many pages with Connect

var connect = require("connect");
var http = require("http");
var app = connect();

app.use(connect.logger());

// Homepage
app.use(function(request, response, next) {
  if (request.url == "/") {
    response.writeHead(200, { "Content-Type": "text/plain" });
    response.end("Welcome to the homepage!\n");
    // The middleware stops here.
  } else {
    next();
  }
});

// About page
app.use(function(request, response, next) {
  if (request.url == "/about") {
    response.writeHead(200, { "Content-Type": "text/plain" });
    response.end("Welcome to the about page!\n");
    // The middleware stops here.
  } else {
    next();
  }
});

// 404'd!
app.use(function(request, response) {
  response.writeHead(404, { "Content-Type": "text/plain" });
  response.end("404 error!\n");
});

http.createServer(app).listen(1337);

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Express

var express = require("express");
var http = require("http");
var app = express();
http.createServer(app).listen(1337);

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Express Routing

var express = require("express");
var http = require("http");
var app = express();

app.all("*", function(request, response, next) {
  response.writeHead(200, { "Content-Type": "text/plain" });
  next();
});

app.get("/", function(request, response) {
  response.end("Welcome to the homepage!");
});

app.get("/about", function(request, response) {
  response.end("Welcome to the about page!");
});

app.get("/hello/:who", function(req, res) {
  res.end("Hello, " + req.params.who + ".");
  // Fun fact: this has security issues
});

app.get("*", function(request, response) {
  response.end("404!");
});

http.createServer(app).listen(1337);

Перейти в браузере на localhost:1337/hello/animelover69

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Express Redirect

response.redirect("/hello/anime");
response.redirect("http://www.myanimelist.net");
response.redirect(301, "http://www.anime.org");  // HTTP status code 301

response.sendFile("/path/to/anime.mp4");

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Express View

// Start Express
var express = require("express");
var app = express();

// Set the view directory to /views
app.set("views", __dirname + "/views");

// Let's use the Jade templating language
app.set("view engine", "jade");

app.get("/", function(request, response) {
  response.render("index", { message: "I love anime" });
});

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Connect and Node inside Express

var express = require("express");
var app = express();

app.use(express.logger());  // Inherited from Connect

app.get("/", function(req, res) {
  res.send("anime");
});

app.listen(1337);

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Read more on evanhahn.com/understanding-express-js/