I'm trying on my own to create a robots.txt based on a document type with template. If I go to "http://mysite.com/settings/robots-txt" it works. If I go to the URL Alias "http://mysite.com/robots.txt" I get a 404 not found.

I'm not sure if it's my URL rewrite rule or if it's a conflict with the umbracoUrlAlias. Any assistance is appreciated. Below is my current implementation.

I added a URL rewrite rule to remove the trailing slash and the umbracoSettings.config requestHandler "addTrailingSlash>false</addTrailingSlash>"

The document type has one property editor: umbracoUrlAlias with default value of robots.txt

Here's the template:

@inherits Umbraco.Web.Mvc.UmbracoViewPage<ContentModels.RobotsTxt>
@using ContentModels = Umbraco.Web.PublishedModels;
@{
Layout = null;
Response.ContentType = "text/plain";
var siteMap = Model.AncestorOrSelf<HomePage>().FirstChild<SiteSettings>().FirstChild<XmlSiteMap>();
}
/* my robots.txt text goes here */

URL Rewrite Rule:

<rewrite>
      <rules>
      <rule name="Remove trailing slash" stopProcessing="true">
        <match url="(.*)/$" />
        <conditions>
          <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
          <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
        </conditions>
        <action type="Redirect" redirectType="Permanent" url="{R:1}" />
      </rule>
      </rules>
    </rewrite>

Published URLs: