To configure the base URL for the action URL returned by the

/self-service/login/api

route in Ory Kratos, you need to set the

serve.public.base_url

configuration option. This setting determines the base URL used for various self-service flows, including the login flow. You can configure this in your Kratos configuration file (usually named

kratos.yml

) as follows:

yaml serve:   public:     base_url: <https://your-kratos-public-url.com/>

Replace

<https://your-kratos-public-url.com/>

with the actual public URL where your Kratos instance is accessible. Alternatively, you can set this configuration using an environment variable:

SERVE_PUBLIC_BASE_URL=<https://your-kratos-public-url.com/>

This configuration ensures that the action URL returned in the login flow response points to your Kratos instance. For more detailed information on configuring Ory Kratos, you can refer to the [Kratos Configuration Documentation](https://www.ory.sh/docs/kratos/configuring). [Kratos Configuration](https://www.ory.sh/docs/kratos/configuring)