Beginner Question HTTP GET

openhab does not officially support http/get to trigger items, only htp/post.
In case you cannot use http/post I suggest the following options:

  1. official way
    use this binding
    this binding is not released. You have to install it yourself. I am also using it and it just works great

  2. inofficial way
    use this http/get request:

openhab:8080/basicui/CMD?item=command

You have to install BasicUI and be aware that this hack may be dropped any time without any prior notice as it is an unsupported feature are a feature used for something elase but to trigger items from 3rd party devices.