Simon Mourier's Blog - How can you turn off request validation in IIS Express?

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How can you turn off request validation in IIS Express?

Mar 1, 2011 See the question and my original answer on StackOverflow

Maybe you could try to change the web.config like this:

<system.web>
 <httpRuntime requestValidationMode="2.0" />
</system.web>

(more info here: http://www.asp.net/learn/whitepapers/aspnet4/breaking-changes)