IIS is automatically call to http://localhost after application pool get recycled or stop and start

Simon Dao 0 Reputation points

We have some .Net applications running on Windows servers and backed by IIS.
We noticed that when the application pool got recycled or stop&start.
There will be a call to http://localhost/ with the clientIP
This is annoying us because we didn't have anything on / so it returned 404 and it reported to our monitoring tool(Azure Application Insight)

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Is there any config to prevent this behavior(disable auto call to http://localhost/)?
This is our IIS version
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Internet Information Services
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