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Wait for an HTTP endpoint to return 200 OK with Bash and curl
bash -c 'while [[ "$(curl -s -o /dev/null -w ''%{http_code}'' localhost:9000)" != "200" ]]; do sleep 5; done'
# also check https://gist.github.com/rgl/c2ba64b7e2a5a04d1eb65983995dce76
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