HttpHandlers with ASP.NET MVC

Question

If I have a standard AXD HttpHandler and the default ignore route for *.axd, then why is ASP.NET MVC still handling requests in subdirs, for instance if there is a request made for **/Content/Css/**css.axd?d.... If the request is made at root /css.axd?d.... everything works fine.

You might want to post your route, could be a problem with how you are defining it. — Wyatt Barnett
– Wyatt Barnett, Commented Nov 3, 2009 at 14:20
this is the default ignore route: routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); — mare
– mare, Commented Nov 3, 2009 at 15:09

LondonBasedEngineer · Accepted Answer · 2009-11-03 16:38:33Z

6

I guess the route was deliberately made like that by design, maybe because the wildcard at a start of string isn't as performant.

Unfortunately this won't work:

routes.IgnoreRoute("{ *pathAndResource }.axd/{ *pathInfo }")

The solution is to use constraints - see Phil Haack's blog post

Phil's blogs uses a regular expression constraint, but you could create you own custom contraint alternatively to make things more readable:

routes.IgnoreRoute("match axds"
 "{*url}", new { controller = "MyController", action = "MyAction" }, new
              {
                  myCustomConstraint = new FileExtensionConstraint(".axd")
              }

answered Nov 3, 2009 at 16:38

LondonBasedEngineer

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2 Comments

mare Over a year ago

Why is that default IgnoreRoute there then? In every new ASP.NET MVC projects created...

LondonBasedEngineer Over a year ago

The default ignore route is needed to support asp.net 2.0's built-in web resources which are always found at: /webresource.axd see: support.microsoft.com/kb/910442.

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