This web server supports HTML files and JavaScript files. However it does not su

Question

This web server supports HTML files and JavaScript files. However it does not support any JPEG image files. Your job is to modify this web server so it will support JPEG image files. In the midterm file there is pic1.jpg, pic.jpg, and pic3.jpg. There is also index.html and a server.js file. Modify the server.js file so that it will read and show the three jpg images as a slideshow when you open the html browser page.

Here is the given server.js code below:

var http = require('http');
var fs = require('fs');
var path = require('path');
var mime = require('mime');// calling the npm mime package

function send404(response) {
    response.writeHead(404, { 'Content-Type': 'text/plain' });
    response.write('Error 404: Resource not found.');
    response.end();
}

var mimeLookup = {
    '.js': 'application/javascript',
    '.html': 'text/html'
};

var server = http.createServer(function (req, res) {

    if (req.method == 'GET') {

        // resolve file path to filesystem path
        var fileurl;
        if (req.url == '/') fileurl = '/index.html';
        else fileurl = req.url;
        var filepath = path.resolve('./' + fileurl);

        // lookup mime type
        var fileExt = path.extname(filepath);
        var mimeType = mimeLookup[fileExt];
        if (!mimeType) {
            send404(res);
            return;
        }

        // see if we have that file
        fs.exists(filepath, function (exists) {

            // if not
            if (!exists) {
                send404(res);
                return;
            };

            // finally stream the file
            res.writeHead(200, { 'content-type': mimeType });
            fs.createReadStream(filepath).pipe(res);
        });
    }
    else {
        send404(res);
    }
}).listen(3000);
console.log('server running on port 3000');

Explanation / Answer

//mimes means the filetypes, so it searching in the mimeLookup array. So if we ad to list, it will accept

var http = require('http');
var fs = require('fs');
var path = require('path');
var mime = require('mime');// calling the npm mime package

function send404(response) {
    response.writeHead(404, { 'Content-Type': 'text/plain' });
    response.write('Error 404: Resource not found.');
    response.end();
}

var mimeLookup = {
    '.js': 'application/javascript',
    '.html': 'text/html',

    '.jpeg': 'image/jpeg',

    '.jpg': 'image/jpeg'
};

var server = http.createServer(function (req, res) {

    if (req.method == 'GET') {

        // resolve file path to filesystem path
        var fileurl;
        if (req.url == '/') fileurl = '/index.html';
        else fileurl = req.url;
        var filepath = path.resolve('./' + fileurl);

        // lookup mime type
        var fileExt = path.extname(filepath);
        var mimeType = mimeLookup[fileExt];
        if (!mimeType) {
            send404(res);
            return;
        }

        // see if we have that file
        fs.exists(filepath, function (exists) {

            // if not
            if (!exists) {
                send404(res);
                return;
            };

            // finally stream the file
            res.writeHead(200, { 'content-type': mimeType });
            fs.createReadStream(filepath).pipe(res);
        });
    }
    else {
        send404(res);
    }
}).listen(3000);
console.log('server running on port 3000');

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