Plus (+) in MVC Argument causes 404 on IIS 7.0

Question

I have an MVC route that is giving me hell on a staging server running IIS. I am running Visual Studio 2010\'s development server locally.

Here is a sample URL that

Answer 1

+ only has the special meaning of being a space in application/x-www-form-urlencoded data such as the query string part of a URL.

In other parts of the URL like path components, + literally means a plus sign. So resolving Full+Size to the unencoded name Full Size should not work anywhere.

The only correct form of a space in a path component is %20. (It still works when you type an actual space because the browser spots the error and corrects it for you.) %20 also works in form-URL-encoded data as well, so it's generally safest to always use that.

Sadly HttpUtility.UrlEncode is misleadingly-named. It produces + in its output instead of %20, so it's really a form-URL-encoder and not a standard URL-encoder. Unfortunately I don't know of an ASP.NET function to “really URL-encode” strings for use in a path, so all I can recommend is doing a string replace of + to %20 after encoding.

Alternatively, avoid using spaces in path parts, eg. by replacing them with -. It's common to ‘slug’ titles being inserted to URLs, reducing them to simple alphanumerics and ‘safe’ punctuation, to avoid filling the URL with ugly %nn sequences.