sbws should send scanner metadata as part of every HTTP request
We can't find out which torflow instances are using a bandwidth server: https://lists.torproject.org/pipermail/tor-project/2018-December/002108.html
As far as I can tell, sbws doesn't provide any scanner info in its HTTP requests.
Here's some things we might want:
- software-name: sbws
- software-version
- scanner-nickname
- scanner-IP-address? (pro: doscover users who haven't set nickname, con: discover users)
Non-standard HTTP headers start with "X-".
Assigning to 1.0, because this is vital debugging info.
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