This document describes the general behavior of Heroku as it relates to the recognition and execution of Node.js applications. For a more detailed explanation of how to deploy an application, see Getting Started on Heroku with Node.js. Activation The Heroku Node.js buildpack is used when the application has apackage.json file in the root directory. Node.js Runtimes Node versions adhere to Semver,
Preboot changes the standard dyno start behavior for web dynos. Instead of stopping the existing set of web dynos before starting the new ones, preboot ensures that the new web dynos are started (and receive traffic) before the existing ones are terminated. This can contribute to zero downtime deployments. Preboot is only available on the Common Runtime to apps that are using professional dyno typ
With Automated Certificate Management (ACM), Heroku automatically manages TLS certificates for apps in the Common Runtime, and for apps in Private Spaces that enable the feature. Certificates handled by ACM automatically renew one month before they expire, and new certificates are created automatically whenever you add or remove a custom domain. All applications include ACM for free. Automated Cer
Web applications that process concurrent requests make more efficient use of dyno resources than those that only process one request at a time. Puma is a webserver that competes with Unicorn and allows you to handle concurrent requests. Puma uses threads, in addition to worker processes, to make more use of available CPU. You can only utilize threads in Puma if your entire code-base is thread safe
Additional ResourcesHomeElementsProductsPricingCareersHelpStatusEventsPodcastsCompliance CenterHeroku BlogHeroku Blog Find out what's new with Heroku on our blog. Visit Blog Heroku can run Ruby applications across a variety of Ruby implementations and includes support for framework-specific workflows. This document describes the general behavior of Heroku as it relates to the recognition and execu
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