title: A potentially dangerous Request.Path value was detected from the client (:)
body: <p>I'am getting sometimes the following error on my published web app with ELMAH:</p>
  
  <pre><code>System.Web.HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (:).
  at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()
  at System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context)
  </code></pre>
  
  <p>in the URL reported by elmah I get:</p>
  
  <blockquote>
    <p>/https:/domain.com/</p>
  </blockquote>
  
  <p>Do I have to put the following line in my web.config, to fix it?:</p>
  
  <pre><code>&lt;httpRuntime requestValidationMode="2.0" /&gt;
  </code></pre>
  
  <p>What this really means? I should be careful about this?</p>