I understand that there are already alot of web server out there.
But i feel like creating one for learning purpose.
Is it something i should try to figure out and any guides or tutorials on this?
Might be more appropriate as a comment, since it doesn't answer the OP's question.
Robert Harvey
2010-05-15 17:39:35
OP asked for things to figure out, and I think it's good to figure out how a basic client works.
svinto
2010-05-15 17:43:07
A:
Start with understanding TCP/IP and the whole Internet protocol suite.
Then learn the HTTP 1.0 and 1.1 protocols.
That should start you on the way to understanding what you need to write in order to create a webserver from scratch.
Oded
2010-05-15 17:40:40
+1
A:
In java:
Create a ServerSocket and have this continually listen for connections - when a connection request comes in handle it by by parsing the HTTP request header, get the resource indicated and add some header information before sending back to the client. eg.
public class Server implements Runnable {
protected volatile boolean keepProcessing = true;
protected ServerSocket serverSocket;
protected static final int DEFAULT_TIMEOUT = 100000;
protected ExecutorService executor = Executors.newCachedThreadPool();
public Server(int port) throws IOException {
serverSocket = new ServerSocket(port);
serverSocket.setSoTimeout(DEFAULT_TIMEOUT);
}
@Override
public void run() {
while (keepProcessing) {
try {
Socket socket = serverSocket.accept();
System.out.println("client accepted");
executor.execute(new HttpRequest(socket));
} catch (Exception e) {
}
}
closeIgnoringException(serverSocket);
}
protected void closeIgnoringException(ServerSocket serverSocket) {
if (serverSocket != null) {
try {
serverSocket.close();
} catch (IOException ignore) {
}
}
}
public static void main(String[] args) {
ExecutorService executor = Executors.newCachedThreadPool();
try {
executor.execute(new WebServer(6789));
} catch (Exception e) {
e.printStackTrace();
}
}
}
final class HttpRequest implements Runnable {
final static String CRLF = "\r\n";
private Socket socket;
public HttpRequest(Socket socket) {
this.socket = socket;
}
public void run() {
try {
processRequest();
} catch (Exception e) {
System.out.println(e);
}
}
private void processRequest() throws Exception {
DataOutputStream os = new DataOutputStream(socket.getOutputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(socket
.getInputStream()));
String requestLine = br.readLine();
System.out.println();
System.out.println(requestLine);
List<String> tokens = Arrays.asList(requestLine.split(" "));
Iterator<String> it = tokens.iterator();
it.next(); // skip over the method, which should be "GET"
String fileName = it.next();
fileName = "." + fileName;
FileInputStream fis = null;
boolean fileExists = true;
try {
fis = new FileInputStream(fileName);
} catch (FileNotFoundException e) {
fileExists = false;
}
String statusLine = null;
String contentTypeLine = null;
String entityBody = null;
String contentType = null;
if (fileExists) {
statusLine = "HTTP/1.0 200 OK";
contentType = contentType(fileName);
contentTypeLine = "Content-type: " + contentType + CRLF;
} else {
statusLine = "HTTP/1.0 404 NOT FOUND";
contentType = "text/html";
contentTypeLine = "Content-type: " + contentType + CRLF;
entityBody = "<HTML>" + "<HEAD><TITLE>Not Found</TITLE></HEAD>"
+ "<BODY>" + statusLine + " Not Found</BODY></HTML>";
}
os.writeBytes(statusLine);
os.writeBytes(contentTypeLine);
os.writeBytes(CRLF);
if (fileExists) {
sendBytes(fis, os);
fis.close();
} else {
os.writeBytes(entityBody);
}
String headerLine = null;
while ((headerLine = br.readLine()).length() != 0) {
System.out.println(headerLine);
}
os.close();
br.close();
socket.close();
}
private static void sendBytes(InputStream fis, DataOutputStream os)
throws Exception {
byte[] buffer = new byte[1024];
int bytes = 0;
while ((bytes = fis.read(buffer)) != -1) {
os.write(buffer, 0, bytes);
}
}
private static String contentType(String fileName) {
if (fileName.endsWith(".htm") || fileName.endsWith(".html")) {
return "text/html";
}
if (fileName.endsWith(".jpg") || fileName.endsWith(".jpeg")) {
return "image/jpeg";
}
if (fileName.endsWith(".gif")) {
return "image/gif";
}
if (fileName.endsWith(".txt")) {
return "text/plain";
}
if (fileName.endsWith(".pdf")) {
return "application/pdf";
}
return "application/octet-stream";
}
}
Robert
2010-05-15 17:54:08
Where do i stored the files? And also what are the interesting things i can do with the webserver?
Dave
2010-05-16 02:11:10
you store the files in the project home directory. The interesting things you can do are whatever your imagination dictates: this is a barebones webserver that does nothing except serve files... you wanted to learn about webservers, modify it, study it, do whatever it takes
Robert
2010-05-16 10:41:36
+1
A:
Most scripting language are capable and have plenty of examples on writing web servers. This route will give you a gentle introduction.
zaf
2010-05-15 18:03:13
+1
A:
Try asio from boost!
Boost.Asio is a cross-platform C++ library for network and low-level I/O programming that provides developers with a consistent asynchronous model using a modern C++ approach.
sonofdelphi
2010-05-15 18:09:11