This is a replacement server of the now discontinued "Flipnote Hatena service" from 2008 - 2013
here are the list of Nintendo DSi headers that get used while connecting or in use of Flipnote Hatena:
X-DSi-MAC
The Nintendo DSi MAC Address seen in the Internet Settings (Uppercase HEX)
X-DSi-ID
A User's Flipnote Studio ID (uppercase HEX, 16 Digits)
X-DSi-Auth-Response
8-byte lowercase HEX string, based on auth challenge value
X-DSi-SID
Hatena's Session ID (shut Down 2018)
X-Ugomemo-Version
The Flipnote Studio app version (0, 1, or 2)
X-DSi-User-Name
The Username of the DSi console
X-DSi-Region
The DSi Console region
X-DSi-Lang
2 letter regions (us, eu or jp)
X-DSi-Country
2 Letter Country code (Uppercase)
X-Birthday
A User's DSi Birthday (YYYYMMDD Format)
X-DSi-DateTime
DSi Console date and time (format is YYYY-MM-DD_hh:mm:ss)
X-DSi-Color
DSi User's favorite color (lowercase HEX string, rgb555 format)