Hey Pedro,
To send data, Tealium relies on some sort of data layer. At this time there isn't a way for Tealium to parse an http call to get the needed data. This sort of parsing would need to be done on the client's end, and the corresponding data would then be populated in a readable JavaScript data object. Tealium can then use that data object and configure the various vendor tags to use the data accordingly.
With that said, we are currently working on server to server integrations for a couple of our Analytics Vendors, Universal Google Analytics being one of them. Essentially these Server to Server tags will allow you to create a server side http/s server call using the vendor's API.