Why is Mattermost sending me HTTP HEAD requests?

I happened to host an HTTP server for a short period of time, and noticed the following traffic:

User-Agent: Go-http-client/1.1

HTTP/1.0 200 OK
Server: SimpleHTTP/0.6 Python/3.8.1
Date: Tue, 07 Apr 2020 16:11:20 GMT
Content-type: text/html; charset=utf-8
Content-Length: 4242

This traffic originated from my Mattermost server. Has anybody else seen this behavior?

Is this expected activity? If so, why?

@paulrothrock Would support team be familiar with this?

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