How To Deploy a Rust Web Server to Heroku Using Axum, Docker, and GitHub Actions

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Hello. Today, we’re gonna use Axum as our web framework.

So, to start things off, we need to add Axum and Tokio as dependencies to Cargo.toml.

On the main.rs, we’re gonna add the hello world version from Axum’s official documentation:

This is a good start, but we need to make the port the server listens to more flexible to work on Heroku. We need to use the environment variable PORT, as shown below: