That's a bit drastic to jump from a simple HTTP server to full-blown browser engine, also a bit apples and oranges.
![Wink ;)](https://www.sfml-dev.org/forums/Smileys/default/wink.gif)
SFML certainly isn't the best tool if your goal is to create a server. It can be done, but it will require a lot of work or use of third-party libraries.