Support for 404 pages

src/Pretzel/WebHost/WebHost.cs

@@ -68,10 +68,20 @@ Task NewServerCallback(IDictionary<string, object> env)
 
  if (!content.IsAvailable(path))
  {
- var response = new Response(env) { ContentType = path.MimeType() };
+ var path404 = "/404.html";
+ var use404 = content.IsAvailable(path404);
+
+ var response = new Response(env) { ContentType = use404 ? path404.MimeType() : path.MimeType() };
  using (var writer = new StreamWriter(response.OutputStream))
  {
- writer.Write("Page not found: " + path);
+ if (use404)
+ {
+ writer.Write(content.GetContent(path404));
+ }
+ else
+ {
+ writer.Write("Page not found: " + path);
+ }
  }
  return TaskHelpers.Completed();
  }