Step Three: Define RequestHandler Functions public string GetHeader(Socket socket) (buffer, receivedBytes, SocketFlags.None) ReceivedBytes = clientSocket.Receive(buffer) Send the real server response to the client through server socket Receive Response from the real server through client socket IPEndPoint remoteEP = new IPEndPoint (addresslist, 80) IPAddress addresslist = Dns.GetHostAddresses(host) Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) Public class RequestHandler(Socket serverSocket) Thread requestThread = new Thread(new ThreadStart(rh.Handle)) RequestHandler rh = new RequestHandler() IPAddress ipAddress = IPAddress.Loopback IPEndPoint localEndPoint = new IPEndPoint(ipAddress, portnumber) Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) Step One: Build S const int BACKLOG = 100 S: always receive requests from clients and send server response back to the clientĬ: request to the real server and send the response to the S How can we build proxy server by using c# socket?Ī proxy server is both a web server and a web client, and does the following:
#C# SOCKET PROGRAM SOFTWARE#
Note that a socket in this sense is completely soft – it’s a software object, not a physical component. This simplifies program development because the programmer need only worry about manipulating the socket and can rely on the operating system to actually transport messages across the network correctly. In UNIX, for example, a program can send and receive TCP/IP messages by opening a socket and reading and writing data to and from the socket. What is Socket?Ī software object that connects an application to a network protocol. In this case, it ‘caches’ responses from the remote server, and returns subsequent requests for the same content directly. A proxy server may optionally alter the client’s request or the server’s response, and sometimes it may serve the request without contacting the specified server. If the request is validated by the filter, the proxy provides the resource by connecting to the relevant server and requesting the service on behalf of the client. For example, it may filter traffic by IP address or protocol. The proxy server evaluates the request according to its filtering rules. A client connects to the proxy server, requesting some service, such as a file, connection, web page, or other resource, available from a different server. In computer networks, a proxy server is a server (a computer system or an application program) that acts as an intermediary for requests from clients seeking resources from other servers.