What makes me 'go-to' a language tends to be a question of whether I know how to solve a problem in a language already, and do I have time to do it in a language I don't know how to solve the problem in already.
I'll usually try to churn a solution out in Bash using other programs (curl, sed, jq and stuff) and some pipes. Then if that runs out of steam I'll probably use Golang as I hate it's standard library HTTP client the least, or NodeJS because of experience.
If you gave me a code challenge I'd do it in Common Lisp.
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