context_id = "https://#{host}/contexts/#{UUID.generate()}"
activity_id = "https://#{host}/activities/#{UUID.generate()}"
object_id = "https://#{host}/objects/#{UUID.generate()}"
context_id = "https://#{host}/contexts/#{UUID.generate()}"
activity_id = "https://#{host}/activities/#{UUID.generate()}"
object_id = "https://#{host}/objects/#{UUID.generate()}"