source: binary-improvements/7dtd-server-fixes/src/NetConnections/Servers/Web/StaticHandler.cs@ 142

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Threading;

namespace AllocsFixes.NetConnections.Servers.Web
{
        public class StaticHandler : PathHandler
        {
                private string datapath;
                private string staticPart;
                private bool cache;
                private bool logMissingFiles;
                private Dictionary<string, byte[]> fileCache = new Dictionary<string, byte[]> ();

                public StaticHandler (string staticPart, string filePath, bool cache, bool logMissingFiles)
                {
                        this.staticPart = staticPart;
                        this.datapath = filePath;
                        this.cache = cache;
                        this.logMissingFiles = logMissingFiles;
                }

                public override void HandleRequest (HttpListenerRequest req, HttpListenerResponse resp, HttpListenerBasicIdentity user)
                {
                        try {
                                string fn = req.Url.AbsolutePath.Remove (0, staticPart.Length);

                                byte[] content;
                                if (cache) {
                                        Monitor.Enter (fileCache);
                                        try {
                                                if (!fileCache.ContainsKey (fn)) {
                                                        if (!File.Exists (datapath + "/" + fn)) {
                                                                resp.StatusCode = (int)HttpStatusCode.NotFound;
                                                                if (logMissingFiles)
                                                                        Log.Out ("Web:Static:FileNotFound: \"" + req.Url.AbsolutePath + "\" @ \"" + datapath + "/" + fn + "\"");
                                                                return;
                                                        }

                                                        fileCache.Add (fn, File.ReadAllBytes (datapath + "/" + fn));
                                                }

                                                content = fileCache [fn];
                                        } finally {
                                                Monitor.Exit (fileCache);
                                        }
                                } else {
                                        if (!File.Exists (datapath + "/" + fn)) {
                                                resp.StatusCode = (int)HttpStatusCode.NotFound;
                                                if (logMissingFiles)
                                                        Log.Out ("Web:Static:FileNotFound: \"" + req.Url.AbsolutePath + "\" @ \"" + datapath + "/" + fn + "\"");
                                                return;
                                        }

                                        content = File.ReadAllBytes (datapath + "/" + fn);
                                }

                                resp.ContentType = MimeType.GetMimeType (Path.GetExtension (fn));
                                resp.ContentLength64 = content.Length;
                                resp.OutputStream.Write (content, 0, content.Length);
                        } catch (Exception e) {
                                Log.Out ("Error in StaticHandler.HandleRequest: " + e);
                        }
                }
        }
}