IIS Url Rewrite role doesn't work

[OlegoO]

Expected behavior

See staging content from robots.staging.tx

Actual behavior

See main robots.txt

Steps to reproduce

1. Add rule

<rule name="Robots.txt for production domain only" stopProcessing="true">
            <match url="robots.txt" />
            <conditions>
                <add input="{HTTP_HOST}" pattern="^(virtocommerce\.com)$" negate="true"/>
            </conditions>
            <action type="Rewrite" url="/robots.staging.txt" />
        </rule>

2. Open https://vc-public-qc.azurewebsites.net/robots.txt
3. Should see content from robots.staging.txt

[tatarincev]

This rule doesn't work because ASP.NET Static files middleware handle exists files first rather than UrlRewrite due to the registration order in Startup.cs

...
  app.UseStaticFiles();
...
 app.UseRewriter(rewriteOptions);

So my suggestion to define two production-robots.txt and staging-robots.txt files and add to IISUrlRewrite.xml next rules

 <rule name="Robots.txt prod" stopProcessing="true">
            <match url="robots.txt" />
            <conditions>
                <add input="{HTTP_HOST}" pattern="^(virtocommerce\.com)$" negate="true"/>
            </conditions>
            <action type="Rewrite" url="/staging-robots.txt" />
        </rule>
        <rule name="Robots.txt staging" stopProcessing="true">
            <match url="robots.txt" />
            <conditions>
                <add input="{HTTP_HOST}" pattern="^(virtocommerce\.com)$"/>
            </conditions>
            <action type="Rewrite" url="/production-robots.txt" />
        </rule>