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Sending ContentItemSelection message to TC

Sending ContentItemSelection message to TC

Hi

we are using ContentItemSelectionRequest message to pick/filter content to create an assignment with a UI tool. When user performs selection and click 'Create assignment' button, selection is stored at backend and assignment id is generated. This assignment id is to be send back to TC using ContentItemSelection message using content_item_return_url. I am taking analogy of Outcome service 1.0 where lis_outcome_service_url is equivalent of content_item_return_url and lis_result_sourced_id is equivalent of ltilinkitem. Is it OK to send ContentItemSelection messgae to TC from TP backend (like outcome service) OR message has to be 'front end posted' back from UI tool? Basis of my question is coming from line mentioned in spec - " A form would be included in a page returned to the user’s browser and auto-submitted using JavaScript to the URL provided in the content_item_return_url parameter from the TC"

Thanks !!