Cloudflare Workers, allowing me to run arbitrary code at the edge for incoming requests.
Setting up a worker that picks a random Pokemon and injects it as a header is very simple, add a worker, write the code and add some routing to it.
curl -sI https://kura.gg/ | grep "x-pokemon" x-pokemon: Eevee (#133)
let pokemon = [ "Bulbasaur (#1)", "Ivysaur (#2)", "Venusaur (#3)", "Charmander (#4)", "Charmeleon (#5)", "Charizard (#6)", "Squirtle (#7)", "Wartortle (#8)", "Blastoise (#9)", "Caterpie (#10)", "Metapod (#11)", "Butterfree (#12)", "Weedle (#13)", "Kakuna (#14)", "Beedrill (#15)", "Pidgey …