.NodeJS.Learning.Server.TITLE

NodeJS Learning

1. server.001.js

var http = require("http");

var listener = function(request, response) {
  response.writeHead(200, {
    "Content-Type": "text/plain"
  });
  response.write("Hello World");
  response.end();
};

var server = http.createServer(listener);

server.listen('8000');
console.log('server: 127.0.0.1:8000');

1. server.002.js

// Event Driven test...
// Output:
//  Server has started.
//  Reuest received.  (When you request the server through browser)

var http = require("http");

function onRequest(request, response) {
  console.log("Request received.");
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Hello World");
  response.end();
}

http.createServer(onRequest).listen(8888);

console.log("Server has started.");

2. module.001.js

// This is 'server.js'

var http = require("http");

function start() {
  function onRequest(request, response) {
    console.log("Request received.");
    response.writeHead(200, {"Content-Type": "text/plain"});
    response.write("Hello World");
    response.end();
  }

  http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}

exports.start = start;

2. module.002.js

// This is 'index.js'
// just for import and use the module 'server'

var server = require("./server");

server.start();

3.route.001.js

// url.parse about


                    url.parse(string).query
                                           |
           url.parse(string).pathname      |
                       |                   |
                       |                   |
                     ------ -------------------
http://localhost:8888/start?foo=bar&hello=world
                                ---       -----
                                 |          |
                                 |          |
              querystring(string)["foo"]    |
                                            |
                         querystring(string)["hello"]

3.route.002.js

// url.parse sample

var http = require("http");
var url = require("url");
function start() {
  function onRequest(request, response) {
    // url pathname
    var pathname = url.parse(request.url).pathname;
    
    console.log("Request for " + pathname + " received.");
    response.writeHead(200, {"Content-Type": "text/plain"});
    response.write("Hello World");
    response.end();
  }
  http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}
exports.start = start;

//
// Output:
//
// Server has started.
// Request for / received.
// Request for /favicon.ico received.
// Request for /213 received.
// Request for /favicon.ico received.

3.route.003.index.js

var server = require("./server");
var router = require("./router");

server.start(router.route);

3.route.003.router.js

function route(pathname) {
  console.log("About to route a request for " + pathname);
}

exports.route = route;

3.route.003.server.js

var http = require("http");
var url = require("url");

// Injecte the dependency of the Router module
function start(route) {
  function onRequest(request, response) {
    var pathname = url.parse(request.url).pathname;
    console.log("Request for " + pathname + " received.");

    route(pathname);

    response.writeHead(200, {"Content-Type": "text/plain"});
    response.write("Hello World");
    response.end();
}
  http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}
exports.start = start;

3.route.004.index.js

var server = require("./server");
var router = require("./router");
var requestHandlers = require("./requestHandlers");

var handle = {}

handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;

server.start(router.route, handle);

3.route.004.requestHandlers.js

function start() {
  console.log("Request handler 'start' was called.");
}

function upload() {
  console.log("Request handler 'upload' was called.");
}
exports.start = start;
exports.upload = upload;

3.route.004.router.js

// handle[...] is a function
// pathname is a string
function route(handle, pathname) {
  console.log("About to route a request for " + pathname);
  if (typeof handle[pathname] === 'function') {
    handle[pathname]();
  } else {
    console.log("No request handler found for " + pathname);
  }
}
exports.route = route;

3.route.004.server.js

var http = require("http");
var url = require("url");

function start(route, handle) {
  function onRequest(request, response) {
    var pathname = url.parse(request.url).pathname;
    console.log("Request for " + pathname + " received.");

    route(handle, pathname);
    
    response.writeHead(200, {
      "Content-Type": "text/plain"
    });
    response.write("Hello World");
    response.end();
  }
  http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}
exports.start = start;

4.response.001.requestHandler.js

// requestHandler.js
function start() {
  console.log("Request handler 'start' was called.");
  return "Hello Start";
}

function upload() {
  console.log("Request handler 'upload' was called.");
  return "Hello Upload";
}

exports.start = start;
exports.upload = upload;

4.response.001.router.js

// router.js
function route(handle, pathname) {
  console.log("About to route a request for " + pathname);
  if (typeof handle[pathname] === 'function') {
    return handle[pathname]();
  } else {
    console.log("No request handler found for " + pathname);
    return "404 Not found";
  }
}

exports.route = route;

4.response.001.server.js

// server.js
var http = require("http");
var url = require("url");

function start(route, handle) {
  function onRequest(request, response) {
    var pathname = url.parse(request.url).pathname;
    console.log("Request for " + pathname + " received.");

response.writeHead(200, {"Content-Type": "text/plain"});
    var content = route(handle, pathname)
    response.write(content);
    response.end();
  }

http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}

exports.start = start;