proxy – Suspicious HEAD http requests

On my Windows 10 machine, I run mitmproxy on localhost:8080. I’ve changed the system proxy setting to point to my local proxy server.

Apart from what I expect to see, I can also see the following HEAD requests:

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Typically, the headers look like this:

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It looks the same for every request, just the Host header changes.

What are these? I tried to google the most of them, but I’m unable to get any relevant results.

In mitmproxy in event log, I can see records related to these requests (these 4 lines are related to the first http://ewxfuvvehmlzvfd/ request):

127.0.0.1:55607: error establishing server connection: (Errno 11001) getaddrinfo failed
127.0.0.1:55607: client disconnect
127.0.0.1:55607: closing transports...
127.0.0.1:55607: transports closed!

I also tried to run:

> Get-Process -Id (Get-NetTCPConnection -LocalPort 55607).OwningProcess

with no useful result but Get-NetTCPConnection : No MSFT_NetTCPConnection objects found with property 'LocalPort' equal to '55607'...