refer to:
https://github.com/0x727/ObserverWard
observerward: detect website
fingerprint project: https://github.com/0x727/FingerprintHub
conclusion: useful ,but not 100% accurate. should check manually.
1. download:
https://github.com/0x727/ObserverWard/releases
2. extrac
3. $ ./observer_ward --help
4. update finger print file:
./observer_ward -u

file is large.

4. run: $ ./observer_ward -f siwei.me
the result is not accurate. ( should be rails)
