ImageResizer and image files without an extension - asp.net-mvc

Question

I've been using ImageResizer.net just fine in our web app, but now I need it to resize and serve images that don't (and cannot) have a file extension, like this one:
http://localhost:58306/ClientImages/Batch/2012/12/10/f45198b7c452466684a4079de8d5f85f?width=600
In this situation, I know that my files are always TIFF's, but they wont have a file extension.
What are my options?
/resizer.debug.ashx: https://gist.github.com/raw/9c867823c983f0e5be10/4db31cb21af8b9b36f0aa4e765f6f459ba4b309f/gistfile1.txt
Update
I followed Computer Linguist's instructions:
protected void Application_Start()
{
Config.Current.Pipeline.PostAuthorizeRequestStart +=
delegate
{
var path = Config.Current.Pipeline.PreRewritePath;
var clientImgsRelPath = PathUtils.ResolveAppRelative("~/ClientImages/");
var isClientImageRequest = path.StartsWith(clientImgsRelPath, StringComparison.OrdinalIgnoreCase);
if (isClientImageRequest)
Config.Current.Pipeline.SkipFileTypeCheck = true;
};
// other app start code here
}
http://localhost:58306/ClientImages/Batch/2012/12/10/92d67b45584144beb5f791aaaf760252?width=600 just responds with the original image with no resizing.
This was also asked about here: http://imageresizing.net/docs/howto/cache-non-images#comment-571615564
This is happening during development with the Cassini or Visual Studio web server or whatever you want to call it.

Answer 1

First, you MUST be using IIS7 Integrated mode. Classic mode will not work; it does not permit ASP.NET access to extensionless requests
ImageResizer can't know that extension-less URLs are images unless you explicitly tell it.
This doc explains:
http://imageresizing.net/docs/howto/cache-non-images
Essentially, you'll end up performing logic (usually String.StartsWith) on your URLs to find out if ImageResizer should treat the file as an image.
Config.Current.Pipeline.PostAuthorizeRequestStart += delegate(IHttpModule sender, HttpContext context) {
string path = Config.Current.Pipeline.PreRewritePath;
//Skip the file extension check for everything in this folder:
if (path.StartsWith(PathUtils.ResolveAppRelative("~/folder/of/images"),
StringComparison.OrdinalIgnoreCase)){
Config.Current.Pipeline.SkipFileTypeCheck = true;
}
};
You should register this event handler in Application_Start in global.asax.