This small app demostrates the use of ActionController::Live Rails controller concern to slowly generate a CSV file without triggering the Heroku's timeout limits of 30'' responses.
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Ruby version: should be ok with 2.x
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Tested with rails 6.x and 7 edge
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No Database required
Use the browser and follow the link to start the CSV generation that takes more than 30'' to finish or use a CLI tool like curl to see line by line the generated output:
curl -i http://localhost:3000/exporter.csv
Ouptut:
