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Using command-line tools and REST clients to access ports
When you forward a port, your application becomes available at a URL such as https://USERNAME-CODESPACE-NAME-vrpqrxxrx7x2rxx-4000.preview.app.github.dev. If you forward a private port from the {% data variables.product.prodname_vscode_shortname %} desktop application, your application will also be available at a localhost port such as 127.0.0.1:4000.
To access your application using a REST client, such as Postman, or a command-line tool like curl, you don't need to authenticate if you're using a localhost port, or if you're accessing a public port at the remote domain. However, to connect to a private port at the remote domain, you must authenticate by using the GITHUB_TOKEN access token in your request.
{% note %}
Note: The GITHUB_TOKEN is automatically created when you start a codespace and remains the same for the duration of the codespace session. If you stop and then restart a codespace a new GITHUB_TOKEN is generated.
{% endnote %}