RESTinio is a header-only C++14 library that gives you an embedded HTTP/Websocket server. It is based on standalone version of ASIO and targeted primarily for asynchronous processing of HTTP-requests. Since v.0.4.1 Boost::ASIO (1.66 or higher) is also supported (see notes on building with Boost::ASIO). Server runs on the main thread, and respond to all requests with hello-world message. Of course you've got an access to the structure of a given HTTP request, so you can apply a complex logic for handling requests.