Question on front-end developing

You'll rarely need HTTP for front-end webdev unless you're going to be doing lots of AJAX.
But no, I really don't think that's all you need anymore. Frameworks like React, Vue, jQuery and a variety of other graphics frameworks (particles.js, for instance) are becoming way more in-demand. On top of that you have CSS/HTML frameworks, like Bootstrap or preprocessors like SASS.

The absolute bare minimum you'll need is HTML/CSS/JS. To actually get a job/offer, then you're going to need more under your belt.