Rest sensor: State max length is 255 characters

[123 (Taras)]

You can’t store more than 255 characters in an entity’s state property.

However, you can store more than 255 characters in an entity’s attribute. Use the json_attributes option to put the received data into one or more attributes. Here’s an example of how to do that:

Need help storing URL for use in generic IP camera (over 255 chars)

Attributes can be longer than 255 characters; perhaps you could put the URL into an attribute instead, and some dummy value for the actual sensor? Or some other response (possibly even a truncated string) that you can ignore. You can use the json_attributes thing to capture this other info. Take a look at the file I attached to the first post in this thread Monitor your Generac generator with Home Assistant for an example. Just an excerpt that might give you a sense of this: - platform: …