Solution

src/createServer.js

@@ -1,8 +1,67 @@
 'use strict';
 
+const http = require('http');
+const path = require('path');
+const fs = require('fs');
+
+const MIME_TYPES = {
+  '.html': 'text/html',
+  '.css': 'text/css',
+  '.js': 'application/javascript',
+  '.json': 'application/json',
+  '.png': 'image/png',
+  '.jpg': 'image/jpeg',
+  '.jpeg': 'image/jpeg',
+  '.svg': 'image/svg+xml',
+  '.txt': 'text/plain',
+};
+
+function getMimeType(filePath) {
+  const ext = path.extname(filePath).toLowerCase();
+
+  return MIME_TYPES[ext] || 'application/octet-stream';
+}
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  return http.createServer((req, res) => {
+    const url = new URL(req.url, `http://${req.headers.host}`);
+
+    if (url.pathname === '/file') {
+      res.writeHead(200, { 'Content-Type': 'text/plain' });
+      res.end('Please specify a file path after /file/.');
+
+      return;
+    }
+
+    if (!url.pathname.startsWith('/file')) {
+      res.writeHead(400, { 'Content-Type': 'text/plain' });
+      res.end('Use /file/<path> to load files');
+
+      return;
+    }
+
+    const relativePath = url.pathname.replace(/^\/file\/?/, '') || 'index.html';
+    const publicDir = path.resolve(__dirname, '..', 'public');
+    const fullPath = path.resolve(publicDir, relativePath);
+
+    if (!fullPath.startsWith(publicDir + path.sep) && fullPath !== publicDir) {
+      res.writeHead(404, { 'Content-Type': 'text/plain' });
+      res.end('Not Found');
+
+      return;
+    }
+
+    try {
+      const data = fs.readFileSync(fullPath);
+      const contentType = getMimeType(fullPath);
+
+      res.writeHead(200, { 'Content-Type': contentType });
+      res.end(data);
+    } catch (err) {
+      res.writeHead(404, { 'Content-Type': 'text/plain' });
+      res.end('Not Found');
+    }
+  });
 }
 
 module.exports = {