To configure IIS as reverse proxy you need to install the URL Rewrite extension and the Application Request Routing extension.
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https://www.iis.net/downloads/microsoft/application-request-routing
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Open IIS Manager
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Select your website
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Select
URL Rewrite -
Select
Reverse Proxy -
Enter the url in the field where the request needs to be forwarded (eg: if your application is running on 3000 then
localhost:3000) -
Voila! You're done!