## ASP.NET MVC now escapes spaces in strings passed in via route parameters

### Scope
Minor

### Version Introduced
4.5.2

### Source Analyzer Status
Available

### Change Description
In order to conform to RFC 2396, spaces in route paths are now escaped when populating action parameters from a route. So, whereas  `/controller/action/some data` would previously match the route `/controller/action/{data}` and provide `some data` as the data parameter, it will now provide `some%20data` instead.

- [ ] Quirked
- [ ] Build-time break

### Recommended Action
Code should be updated to unescape string parameters from a route. If the original URI is needed, it can be accessed with the <xref:System.Net.HttpWebRequest.RequestUri>.OriginalString API.

### Affected APIs
* `M:System.Web.Mvc.RouteAttribute.#ctor(System.String)`

### Category
ASP.NET

<!--
    ### Notes
    Single-diagnostic compilation action analyzer
-->

<!-- breaking change id: 125 -->