source: TFP-WebServer/WebServer/src/UrlHandlers/StaticHandler.cs@ 458

using System.IO;
using System.Net;
using Webserver.FileCache;

namespace Webserver.UrlHandlers {
        public class StaticHandler : AbsHandler {
                private readonly AbstractCache cache;
                private readonly string datapath;
                private readonly bool logMissingFiles;

                public StaticHandler (string _filePath, AbstractCache _cache, bool _logMissingFiles,
                        string _moduleName = null) : base (_moduleName) {
                        datapath = $"{_filePath}{(_filePath [^1] == '/' ? "" : "/")}";
                        cache = _cache;
                        logMissingFiles = _logMissingFiles;
                }

                public override void HandleRequest (RequestContext _context) {
                        string fn = _context.RequestPath.Remove (0, urlBasePath.Length);

                        byte[] content = cache.GetFileContent ($"{datapath}{fn}");

                        if (content != null) {
                                _context.Response.ContentType = MimeType.GetMimeType (Path.GetExtension (fn));
                                _context.Response.ContentLength64 = content.Length;
                                _context.Response.OutputStream.Write (content, 0, content.Length);
                        } else {
                                _context.Response.StatusCode = (int) HttpStatusCode.NotFound;
                                if (logMissingFiles) {
                                        Log.Warning ($"[Web] Static: FileNotFound: \"{_context.RequestPath}\" @ \"{datapath}{fn}\"");
                                }
                        }
                }
        }
}