Is it not possible to access localhost during a Github Actions workflow?

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It is possible to access localhost during a Github Actions workflow. However, it can depend on how the local server is set up and how the workflow is configured. Generally, Github Actions workflows run in a separate environment from a local server, so there may need to be extra steps taken to make sure the workflow has access to the correct resources. This could involve port forwarding, setting environment variables, or other configuration changes.