title: A potentially dangerous Request.Path value was detected from the client (<). Getting exception from framework pipline
body: <p>I am getting following exception on appending dodgy value in Api url.</p>
  
  <p>I've tried a lot of different suggestions from other stack overflow questions, like <a href="https://stackoverflow.com/questions/5967103/a-potentially-dangerous-request-path-value-was-detected-from-the-client">1</a> and <a href="https://stackoverflow.com/questions/14897372/asp-net-mvc-excluding-spaces-from-urls-with-requestpathinvalidcharacters">2</a>. However, adding this to my Web.config doesn't work:</p>
  
  <p>Here is error stack trace details:</p>
  
  <blockquote>
    <p>[HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (&lt;).]
       System.Web.HttpRequest.ValidateInputIfRequiredByConfig() +678
       System.Web.PipelineStepManager.ValidateHelper(HttpContext context) +52</p>
  </blockquote>