HTTP plugin: how to pass specific properties values

Hello,
Thanks to this example I managed to send http get commands from a basic switch.
Is there a way to add specific properties that could be used inside the http plugin?

I re-read the exemple and understood that a value in the Value box does the job. However there is something I quite don’t grab at this stage. What is the use and the meaning of the operator. When set to = or += or -= , what does that mean? Sorry for just a basic question, but this would help my learning curve. Thank you

+= is for increment operations
-= is for decrement operations

The Value is how much to increment or decrement.

You will typically see them being used in places like thermostat setpoint adjustments.

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Thanks Bill, I got the picture