Is the usage of configuration.yaml not recommended any more?

If that is the case, what if I wish to change the configuration of some of the built-in integrations, say http integration?

Most Integrations are moving to the GUI, some never will. See: The future of YAML - Home Assistant

You have the choice of setting some things up via both the GUI or YAML.

Other things are either YAML or GUI only.

Http is YAML only.

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Thank you very much :slight_smile: