title: ASP.NET MVC 400 Bad Request with URL restricted characters such as %
body: <p>I'm developing an ASP.NET MVC 3 blog application using VS10 and its asp.net development server, and today I encountered the "HTTP Error 400 - Bad Request" error when I request on a blog post with a slug that has these chars "doesn%25e2%2580%2599t" in it.</p>
  
  <p>I thought the "%" char is allowed in the URL, for example, on StackOverflow you have <a href="https://stackoverflow.com/questions/tagged/c%23">https://stackoverflow.com/questions/tagged/c%23</a> and this link shows you all questions tagged with c#.  So what is the difference for my URL and how do you fix it?  Could anyone explain.</p>
  
  <p>Thank you so much!</p>