heroku procfile - SERP Analysis

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https://stackoverflow.com/questions/16128395/what-is-procfile-and-web-and-worker

https://elements.heroku.com/buildpacks/heroku/heroku-buildpack-multi-procfile

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https://devcenter.heroku.com/articles/getting-started-with-python

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https://devcenter.heroku.com/articles/getting-started-with-nodejs