Tableau Server accepts filters and parameters in URL, so you web site can construct a URL and send a request to Tableau Server. I am not sure how that will work with Tableau licensing - whatever connects to Tableau Server has to have a valid licence.
Thanks for the reply. but my question is can the URL be any length?
I am not aware of any length restrictions on URL, you can either try or ask Tableau Support.
There's a knowledgebase article on setting URL parameters here:
The only limitation that I've encountered is that I haven't been able to set the Measure Names filter in the URL. I haven't run into a length limitation yet.