Servidor web con peticiones actualizadas

package es.udc.redes.webserver;

import java.net.*;
import java.io.*;
import java.util.Date;


public class ServerThread extends Thread {

    private Socket socket;

    public ServerThread(Socket s) {
        // Store the socket s
        this.socket = s;
    }

    private static String getContentType(File file) {
        String name = file.getName();
        String extension = name.substring(name.lastIndexOf(".") + 1);
        String contentType;
        switch (extension) {
            case "html":
                contentType = "text/html";
                break;
            case "txt":
                contentType = "text/plain";
                break;
            case "css":
                contentType = "text/css";
                break;
            case "js":
                contentType = "application/javascript";
                break;
            case "jpg":
            case "jpeg":
                contentType = "image/jpeg";
                break;
            case "gif":
                contentType = "image/gif";
                break;
            case "png":
                contentType = "image/png";
                break;
            case "ico":
                contentType = "image/x-icon";
                break;
            default:
                contentType = "application/octet-stream";
        }
        return contentType;
    }

    public void run() {
        try {
            // This code processes HTTP requests and generates
            // HTTP responses
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            OutputStream out = socket.getOutputStream();
            String peticion = in.readLine();
            String[] parts = peticion.split(" ");
            String metodo = parts[0];
            String url = parts[1];

            if (metodo.equals("GET")) {
                File file = new File(System.getProperty("user.dir") + File.separator + "p1-files" + File.separator + url);
                if (file.exists()) {
                    FileInputStream fis = new FileInputStream(file);
                    byte[] data = new byte[(int) file.length()];
                    fis.read(data);
                    fis.close();
                    String contentType = getContentType(file);
                    Date fecha = new Date(file.lastModified());
                    String response = "HTTP/1.0 200 OK\r\n" +
                            "Content-Length: " + data.length + "\r\n" +
                            "Content-Type: " + contentType + "\r\n" +
                            "Last modified: " +  fecha +
                            "\r\n";
                    out.write(response.getBytes());
                    out.write(data);
                    System.out.println(response);
                } else {
                    String response = "HTTP/1.0 404 Not Found\r\n" +
                            "\r\n";
                    out.write(response.getBytes());
                }
            } else if(metodo.equals("HEAD")){
                System.out.println("Programar método HEAD");
            } else{
                String response = "HTTP/1.0 400 Bad Request\r\n" +
                        "Allow: GET, HEAD\r\n" +
                        "\r\n";
                out.write(response.getBytes());
            }

            in.close();
            out.close();
            socket.close();

            // Uncomment next catch clause after implementing the logic
            //
            } catch (SocketTimeoutException e) {
                System.err.println("Nothing received in 300 secs");
        } catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
        } finally {
            // Close the client socket
        }
    }
}