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copied!<p>By default, the <code>Uri</code> class will not allow an escaped <code>/</code> character (<code>%2f</code>) in a URI (even though this appears to be legal in my reading of <a href="http://tools.ietf.org/html/rfc3986" rel="nofollow noreferrer">RFC 3986</a>).</p> <pre><code>Uri uri = new Uri("http://example.com/%2F"); Console.WriteLine(uri.AbsoluteUri); // prints: http://example.com// </code></pre> <p>(Note: <a href="https://faithlife.codes/blog/2010/08/uritostring_must_die/" rel="nofollow noreferrer">don't use Uri.ToString</a> to print URIs.)</p> <p>According to the <a href="https://connect.microsoft.com/VisualStudio/feedback/details/511010/erroneous-uri-parsing-for-encoded-reserved-characters-according-to-rfc-3986" rel="nofollow noreferrer">bug report for this issue</a> on Microsoft Connect, this behaviour is by design, but you can work around it by adding the following to your app.config or web.config file:</p> <pre><code><uri> <schemeSettings> <add name="http" genericUriParserOptions="DontUnescapePathDotsAndSlashes" /> </schemeSettings> </uri> </code></pre> <p>(Reposted from <a href="https://stackoverflow.com/a/10415482">https://stackoverflow.com/a/10415482</a> because this is the "official" way to avoid this bug without using reflection to modify private fields.)</p> <p><strong>Edit:</strong> The Connect bug report is no longer visible, but the <a href="http://msdn.microsoft.com/en-us/library/ee656539.aspx" rel="nofollow noreferrer">documentation for <code><schemeSettings></code></a> recommends this approach to allow escaped <code>/</code> characters in URIs. Note (as per that article) that there may be security implications for components that don't handle escaped slashes correctly.</p>

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