Build ready-to-use residential proxy URLs

protocol://username:password@host:port URLs targeting a country, optionally a state and a city (a city needs its state). sticky keeps one exit IP for sticky_minutes (1, 3, 10 or 30; default 10) and each of the count URLs gets its own session, so its own IP. rotating changes IP on every request, so every URL would be identical: rotating returns exactly one item whatever count says. A misspelt state is not caught here; the connection then fails. 404 not_found when there is no usable residential traffic.