Libwebsockets

Key Features

• Provides server and client APIs for RFC6455 v13 ws:// and wss:// websocket protocol, along with http:// and https:// • Can be configured to use OpenSSL, CyaSSL, or WolfSSL to provide fully encrypted client and server links - including client certificate support • Lightweight and fast even at 250K connections per thread and beyond - performance per byte and performance per MIPS many times better than traditional solutions • CMake based project that has been used in a variety of OS contexts including Linux (uclibc and glibc), ARM-based embedded boards, MBED3, MIPS / OpenWRT, Windows, Android, Apple iOS and even Tivo. It's used all over the place including The New York Times customer-facing servers and BMW. • It includes a stub webserver that is enough to deliver your scripts to the browser that open websocket connections back to the same server, so it can solve the entire server side, ws://, wss://, http://, and https:// in one step. Apache, Java or any other server-side support is not needed. • Compliant browsers from the last few years are supported on any platform. • Full-strength SSL suport: A+ on SSLLABS test (this server is powered by lwsws) • Architectural features like nonblockinng event loop, zero-copy for payload data and FSM-based protocol parsers make it ideal for realtime operation on resource-constrained devices • Simple, pure C: user code creates a libwebsockets context with options and a callback, library calls the callback when events occur on the connection - no activity on connections == 0% CPU • Posix poll(), libev (ie, epoll) and libuv event loops supported • Proxy support, including Basic Auth