Web and its API that generate different uuid for each access.
Just access https://uuid-v4.web.app.
The website automatically displays a random uuid every time.
Just access https://uuid-v4.web.app/api.
The API responses a random value in JSON.
curl -D - https://uuid-v4.web.app/api
HTTP/2 200
cache-control: private
content-type: application/json; charset=utf-8
etag: W/"2f-0Rg1ywJBEUe/6kOA9No7w/fGk14"
function-execution-id: 3z15255b25ww
server: Google Frontend
x-cloud-trace-context: 0d36cddab2a05bc6b16b2d3064063e8e;o=1
x-powered-by: Express
accept-ranges: bytes
accept-ranges: bytes
date: Thu, 19 Sep 2019 03:29:48 GMT
x-served-by: cache-hnd18725-HND
x-cache: MISS
x-cache-hits: 0
x-timer: S1568863789.500022,VS0,VE254
vary: cookie,need-authorization, x-fh-requested-host, accept-encoding
content-length: 47
{"uuid":"6fa913bc-07c2-423d-8185-7cc82e04e2bd"}⏎
curl https://uuid-v4.web.app/api | jq '.uuid'
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 47 100 47 0 0 173 0 --:--:-- --:--:-- --:--:-- 172
"e5ab8dd5-323c-4d44-bed8-46f9f27f3e52"
MIT