WebSocket++ is an open source (BSD license) header only C++ library that impliments RFC6455 The WebSocket Protocol. It allows integrating WebSocket client and server functionality into C++ programs. It uses interchangable network transport modules including one based on C++ iostreams and one based on Boost Asio.

Development Status

The latest stable version is 0.6.0. Users of prior versions are encouraged to upgrade. Development continues on documentation and examples, expanding compiler support, tracking WebSocket extension development, and advanced performance tuning.

0.2.x, a significantly older version that uses a different API, is no longer under active development, but it is lightly supported with and bug/security fixes. It can be found in the 0.2.x branch on Github.


Server Library
Client Library
License BSD
Library Type Header only (0.3.x+)
Protocol Support Full support: RFC6455
Partial support: Hixie draft 76, Hybi Drafts 7-17
Browser Support Full support: FireFox 6+, Chrome 14+, IE 10+, Safari & Mobile Safari 6+,
Partial support: FireFox 4-5, Chrome 4-13, Safari 5.0.2+, Mobile Safari 4.2+, Opera 11.0+
Platform Support Generally portable. Tested with Linux, OS X, Windows. GCC, LLVM/Clang, Visual Studio. Intel x64, i386, PowerPC, ARM
API Type Asynchronous, message based
Message Types Binary and utf-8 text (not all browsers support binary)
Message Size Limit memory limited, configurable
TLS Support
IPv6 Support
Manual Ping/Pong
Proxy Support Outgoing explicit proxies for regular and secure WebSocket. Basic authentication.
Flow Control Configurable and poll-able queuing for sending and receiving.
Handshake features Passes through all HTTP headers for application use
subprotocol negotiation
custom HTTP errors for application defined handshake failures
application defined HTTP headers in handshake response
HTTP request pass through
Protocol Test Report Autobahn Report (Server)
Autobahn Report (Client)