간단 한 nodejs http 서버 구축 상세 설명

//        Node HTTP   ,          
//          URL    
//  HTTP://localhost:8000 http://127.0.0.1:8000       

//              
var http = require('http');    //   http  api  
var fs = require('fs');      //   fs    api  
var server = new http.Server();  //     HTTP   
var urlapi = require('url');    //   url  api  
server.listen(8000);       //     8000

//   on        ,        ,             ,       
server.on('request', function(request, response) { //   request             
  //      URL
  var url = urlapi.parse(request.url);

  //       ,            url  
  console.log(url.pathname);

  //   URL              
  switch(url.pathname) {  //         
  case ''||'/' : //           ,          ,       index.html   ,nodejs         ,            
    fs.readFile("./page/index.html", function(err, content){ //       
      if(err) { //      ,          
        response.writeHead(404, { 'Content-Type':'text/plain; charset="UTF-8"' });
        response.write(err.message);
        response.end();
      } else { //        
        response.writeHead(200, { 'Content-Type' : 'text/html; charset=UTF-8' }); //       ,       
        response.write(content); //     ,       buter    
        response.end(); //    ,    ,         ,        
      }
    });
    break;
  case '/test/delay'://              
    //               ,  2000  
    var delay = parseInt(url.query) || 2000;
    //         
    response.writeHead(200, {'Content-type':'text/plain; charset=UTF-8'});
    //           
    response.write('Sleeping for' + delay + ' milliseconds...');
    //                 
    setTimeout(function(){
      response.write('done.');
      response.end();
    }, delay);
    break;

  case '/test/mirror'://      test/mirror,      
    //       
    response.writeHead(200, {'Content-type':'text/plain; charset=UTF-8'});
    //               
    response.write(request.mothod + ' ' + request.url + ' HTTP/' + request.httpVersion + '\r
');
    //       
    for (var h in request.headers) {
      response.write(h + ':' + request.headers[h] + '\r
');
    }
    response.write('\r
');//             
    //                 
    //             ,       
    request.on('data', function(chunk) { response.write(chunk); });
    //       ,     
    request.on('end', function(chunk){ response.end(); });
    break;

  case '/json' : //   JSON    
    //       
    response.writeHead(200, {'Content-type':'application/json; charset=UTF-8'});
    response.write(JSON.stringify({test:'success'}));
    response.end();
    break;

  default://            ,           ,              
    var filename = url.pathname.substring(1);  //     '/'
    var type = getType(filename.substring(filename.lastIndexOf('.')+1));
    console.log(filename); //       css  js ....
    //       ,                   
    //          ,   API fs.createReadStream()  
    fs.readFile(filename, function(err, content){
      if(err) {
        response.writeHead(404, { 'Content-Type':'text/plain; charset="UTF-8"' });
        response.write(err.message);
        response.end();
      } else {
        response.writeHead(200, { 'Content-Type' : type });
        response.write(content);
        response.end();
      }
    });
    break;
  }   
});

//                  
function getType(endTag){
  var type=null;
  switch(endTag){
  case 'html' :
     type = 'text/html; charset=UTF-8';
    break;
  case 'htm' :
    type = 'text/html; charset=UTF-8';
    break;
  case 'js' : 
    type = 'application/javascript; charset="UTF-8"';
    break;
  case 'css' :
    type = 'text/css; charset="UTF-8"';
    break;
  case 'txt' :
    type = 'text/plain; charset="UTF-8"';
    break;
  case 'manifest' :
    type = 'text/cache-manifest; charset="UTF-8"';
    break;
  default :
    type = 'application/octet-stream';
    break;
  }
  return type;
}