Check url validity on http plugin

[matteo-cristino]

in case a wrong url is passed as url to conenct to in the http plugin a clear error should be raised. It has happend that an url where a slash was missing, like https:/soemthing.com, did not thrown any error and works well on browser, but fails on mobile without throwing error but simply returning an empty element.

This was a hell to debug 🔥