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POWhy do Url.Action and Request.Url.Host return "localhost"?
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  1. POWhy do Url.Action and Request.Url.Host return "localhost"?
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    copied!<p>I have a form on a page that posts to an external application and I need to send a URL in that post. However, for SOME users the URL is <a href="https://localhost/Home/MyAction" rel="nofollow">https://localhost/Home/MyAction</a> rather than <a href="https://mysubdomain.domain.com/Home/Action" rel="nofollow">https://mysubdomain.domain.com/Home/Action</a>. I haven't been able to reproduce this, but two coworkers get this consistently on the same network as me.</p> <pre><code>&lt;form action="https://externalapp.com/action.cgi" method="POST"&gt; ... &lt;input type="hidden" name="URL" value="@Url.Action("MyAction", "Home", null, "https")"/&gt; &lt;input type="submit" value="Submit" /&gt; &lt;/form&gt; </code></pre> <p>I've tried:</p> <ul> <li>Url.Action("MyAction", "Home", null, "https")</li> <li>Url.Action("MyAction", "Home", null, "https", Request.Url.Host) // This is what MVC does I believe if you don't specify a host</li> <li>Url.Action("MyAction", "Home", null, "https", Request.Url.Authority)</li> <li>Url.Action("MyAction", "Home", null, "https", Request.Headers["host"]) // If you use a non-standard port, that port would appear twice in the URL (e.g. <a href="https://mysubdomain.domain.com:4430/Home/Action" rel="nofollow">https://mysubdomain.domain.com:4430/Home/Action</a>.</li> </ul> <p>Why would some users see localhost at all with this? None of the users are accessing this application from the server on which it's hosted.</p> <p><strong>Update:</strong> Internally the application is accessed with a port number like <a href="https://mysubdomain.domain.com:445/" rel="nofollow">https://mysubdomain.domain.com:445/</a>. Externally it's just the normal 443: <a href="https://mysubdomain.domain.com/" rel="nofollow">https://mysubdomain.domain.com/</a>. For internal users, Url.Action is working perfectly fine. For external users, even if I specify mysubdomain.domain.com to Url.Action, it's still returning localhost for those accessing using port 443. I looked at the MVC code for this and I couldn't figure out why it would overwrite my hostname specification.</p> <p>I checked the HTTPS binding in IIS and it's using the correct SSL certificate. I wonder if somehow the port forwarding from external 443 to internal 445 is breaking it?</p>
 

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