RESTinio is a header-only C++14 library that gives you an embedded HTTP/WebSocket server. It is based on the standalone version of ASIO and is targeted primarily for the asynchronous processing of HTTP requests. Since v.0.4.1 Boost::ASIO (1.66 or higher) is also supported. Consider the task of writing a C++ application that must support some REST API, RESTinio represents our solution for that task. Server runs on the main thread, and responds to all requests with a hello-world message. Of...
Microsoft project for cloud-based client-server communication
...HTTP client/server, JSON, URI, asynchronous streams, WebSockets client, oAuth. A powerful model for composing asynchronous operations based on C++ 11 features. Windows desktop, Windows Store (UWP), Linux, OS X, Unix, iOS, and Android. Support for Visual Studio 2015 and 2017 with debugger visualizers.
SiteMesh is filter plugin for web-servers that provides presentation and web-app application integration. It is easy to use and requires no modification to existing code (HTML, CGI, PHP, etc).
The Scalara.org project provides the open-source infrastructure for the Scalara C++ web services platform-- scalara (ra) 3.x app server, osiris 3.x webserver, and sirius-core 3.x client library (including Scarabs language and Sirius Framework).
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