Simple Node HTTP Server with logging

httpserver.js

var http = require('http'),
    fs = require('fs'),
    path = require('path'),
    port = 8080,
    default_file = 'index.html';
 
http.createServer(function (request, response) {
    
    // Params
    var contentType,
        reqURL = request.url.split('?'),
        file = reqURL[0],
        query = reqURL[1],
        filePath = '.' + file,
        cTypes = { 
            ".html": "text/html",
            ".js": "text/javascript",
            ".css": "text/css"
        };
    
    // Load default_file
    if (filePath == './') {
        filePath = './'+default_file;
    }
    
    // Set content type
    contentType = cTypes[path.extname(filePath)] || 'text/plain';
    
    function logOutput(response,file){
        
        String.prototype.rpad = function(padString, length) {
            var str = this;
            while (str.length < length)
                str = str + padString;
            return str;
        };
        
        var cur_time,
            d = new Date(),
            ampm = 'am',
            hour = d.getHours(),
            min = d.getMinutes(),
            sec = d.getSeconds(),
            month = d.getMonth() + 1,
            day = d.getDate(),
            year = d.getFullYear(),
            warn;
        (min<=9) ? min = '0'+min : min=min;
        (sec<=9) ? sec = '0'+sec : sec=sec;
        cur_time = hour + ':' + min + ':' + sec;
        
        (response!==200) ? warn = '!#> ' : warn = '    '; 
        
        console.log(warn+ ' Response '+response+':  '+file.rpad(' ',50)+request.connection.remoteAddress.rpad(' ',25)+month+'/'+day+'/'+year+' at '+cur_time);
    }
    
     
    // Start checks 
    path.exists(filePath, function(exists) {
     
        if (exists) {
            fs.readFile(filePath, function(error, content) {
                if (error) {
                    response.writeHead(500);
                    response.end();
                    logOutput(500,filePath);
                }
                else {
                    response.writeHead(200, { 'Content-Type': contentType });
                    response.end(content, 'utf-8');
                    logOutput(200,filePath);
                }
            });
        }
        else {
            response.writeHead(404);
            response.end();
            logOutput(404,filePath);
        }
        
    });
     
}).listen(port);

console.log("Server Started on "+port);