I do set static ip for my RPIs, ESP32s, ZigBee Coordinator... via the device web interfaces.
And yes TELENET is our internet provider, but no the TELENET-router does not accept setting static ip for local devices... except for professional (paid) subscription.
if a DeviceName-URL in a "http request node" works perfect, and ditto via Chrome browser.
Why is then the calling in a "html node" not working, and returning "Header fields are too long".