You should be able to load it like so:
Else, if you're using Joomla's Web Asset Manager, then you can define it as a dependency in your JSON object:
Do you want to do a fetch only from the news website (GET requests only) or do you need to push back information from your Joomla! 3 website eg (POST request) ?
Joomla 3 HTTP Client is the same than the 1.x branch on Packagist HTTP Client 1.x
If what you want is GET only you might want to consider using com_newsfeeds and incoming rss feed.
You could use ...