How to forward server query variables in IIS 8?

Question

Windows Server

The essence of the problem is this:
There is IIS, some of the requests for which need to be proxyed to nginx. On nginx, you need to make sure that it receives a packet from the ip address of the client, and not the nginx server.
To do this, IIS needs to add an HTTP header to X-Real-IP when proxying, and the problem will be solved.
The problem is that I haven't been able to get IIS to do it.
web.config:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
                <rule name="test2">
                    <match url="^qwery/(.*)$" />
                    <action type="Rewrite" url="http://example.ru/{R:0}" appendQueryString="true" logRewrittenUrl="true" />
                    <serverVariables>
                        <set name="X-Real-IP" value="{REMOTE_ADDR}" />
                        <set name="X-Forwarded-For" value="{REMOTE_ADDR}" />
                        <set name="ORIGINAL_URI" value="http//{HTTP_HOST}" />
                    </serverVariables>
                </rule>
            </rules>
        </rewrite>
  <security>
            <requestFiltering allowDoubleEscaping="true" />
  </security>

    </system.webServer>
</configuration>

X-Real-IP does not come to nginx.
What's the matter, why is this happening?
Request any ideas on this matter

Answer 1

1) You need to define a variable
-Choose a site
-Redefine URLs (URL Rewrite)
-View server variables (View Rewrite Maps)
-Add (Add Rewrite Map)
-Add HTTP_X_FORWARDED_FOR
2) Define a variable
set name="HTTP_X_FORWARDED_FOR" value="{ REMOTE_ADDR}"
https://docs.microsoft.com/en-us/iis/extensions/ur...