Comparison of WebSocket implementations
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The WebSocket protocol is implemented in different web browsers, web servers, and run-time environments and libraries acting as clients or servers. The following is a table of different features of notable WebSocket implementations.
| Client (library) | Server (library) | Version compared | Protocol (spec) version support | Protocol test report | License | Implementation: language, environment | API: language, environment | Self-hosted server | Text message support | Binary message support | API message-based | API frame-based | API streaming input-output | Flow-control framework | Automatic pongs for pings | Automatic heartbeat pings | Manual pings-pongs | Frame size limit | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Google Chrome 15[1] | Yes | No | 15.0.874.8 12 Sep 2011 |
8 (10) | Complex | C++, WebKit | JavaScript, HTML5 | No | Yes | Yes | Yes | No | No, No | No | Yes | No | No | ≥ 16 MB (memory-limited?) | |
| Google Chrome 16[1] | Yes | No | 16.0.912 13 Dec 2011 |
13 (17/RFC 6455) | Complex | C++, WebKit | JavaScript, HTML5 | No | Yes | Yes | Yes | No | No, No | No | Yes | No | No | ≥ 16 MB (memory-limited?) | |
| Mozilla Firefox 7[2] | Yes | No | 7 beta 12 Sep 2011 |
8 (10) | MPL, GPL, LGPL | C++, Necko | JavaScript, HTML5 | No | Yes | No | Yes | No | No, No | No | Yes | No | No | < 16 MB | |
| Mozilla Firefox 11[2] | Yes | No | 11.0 13 Mar 2012 |
13 (17/RFC 6455) | MPL, GPL, LGPL | C++, Necko | JavaScript, HTML5 | No | Yes | Yes | Yes | No | No, No | No | Yes | No | No | < 2 GB (memory-limited?) | |
| Achex WS[3] | Yes | Yes | 2.17 17 June 2014 |
RFC 6455 | Commercial | C++ | C++, JavaScript | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | 2^16 | |
| Kaazing WebSocket Gateway[4] | Yes | Yes | 5.0 Dec 2014 | RFC 6455 | APL2 (Community Edition), commercial (Enterprise Edition) | Java, JMS | JavaScript, Flash/Flex, Silverlight, Objective-C & iOS, Java, Java & Android, .NET, Xamarin | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | No | memory-limited, configurable | |
| Lightstreamer[5] | Yes | Yes | 7.4.7 12 Jun 2025 |
RFC 6455 | Commercial, freeware | Java | JavaScript, Android, Java, Swift, iOS, macOS, tvOS, watchOS, visionOS, .NET Standard, C++, Python, Flash/Flex, Silverlight, J2ME | Yes | Yes | No | Yes | No | No | Yes | Yes | Yes | No | Data driven, configurable | |
| MigratoryData[6] | Yes | Yes | 6.0.5 29 Aug 2021 |
RFC 6455 | Commercial | Java | JavaScript, iOS, Android, Java, C++, .NET, PHP, Node.js, Python | Yes | Yes | No | Yes | No | No, No | Yes | Yes | Yes | No | 263, configurable | |
| Mongoose[7] | Yes | Yes | 7.9 24 Jan 2023 |
RFC 6455 | GPL, commercial | C/C++ | C/C++ | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | 263, configurable | |
| noPoll[8] | Yes | Yes | 0.3.2 28 aug 2015 |
RFC 6455 | LGPL 2.1 | ANSI C | ANSI C | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | memory-limited, configurable | |
| POCO C++ Libraries[9] | Yes | Yes | 1.4.6 23 Sep 2014 |
RFC 6455 | Boost | C++, POCO C++ Libraries | C++ | Yes | Yes | Yes | No | Yes | Yes | No | No | No | Yes | memory-limited, configurable | |
| PowerWebSockets[10] | Yes | Yes | 15.176.5188 26 Jun 2015 |
RFC 6455 | Test report[11] | Commercial | .NET | .NET Framework, .NET Compact Framework, Xamarin. iOS, Xamarin.Android, Windows Phone, Silverlight, Mono | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | memory-limited, configurable |
| QtWebSockets[12] | Yes | Yes | 1.0 12 Nov 2013 |
RFC 6455 | LGPL | C++, Qt | Qt | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | memory-limited, configurable | |
| RingSocket[13] | No | Yes | 1.0 13 Sep 2019 |
RFC 6455 | MIT | C | C | Yes | Yes | Yes | Yes | No | No | Yes | Yes | No | No | unlimited/configurable | |
| Resin[14] | No | Yes | 4.026 29 Feb 2012 |
RFC 6455 | GPL, commercial | Java, C | Java | Yes | Yes | Yes | No | Yes | No | Yes | No | No | memory-limited, configurable | ||
| WebSocketListener[15] | No | Yes | 2.1.3 24 Nov 2014 |
RFC 6455 | MIT | .NET, Mono | .NET, Mono | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | No | Configurable | |
| Wt[16] | No | Yes | 3.2.0 30 Nov 2011 |
0,7,8,13 (17) | [? Report] | GPL, commercial | C++, Boost Asio | C++ | Yes | Yes | No | No | No | Yes | Yes | Yes | No | memory-limited, configurable | |
| XSockets.NET[17] | Yes | Yes | 5.* | RFC 6455 | Commercial | .NET | Server-languages: Windows (.NET), Unix-Linux (Mono) Client-languages: JavaScript, .NET, Mono |
Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | memory-limited, configurable | |
| RIWA Gateway[18] | Yes | Yes | 2.01 | RFC 6455 | Commercial | Java | Java, Android, iOS, JavaScript | Yes | Yes | Yes | Yes | No | Yes | No | Yes | No | No | memory-limited, configurable | |
| μWebSockets[19] | No | Yes | v0.14.0 28 Mar 2017 |
RFC 6455 | Test report[20] | Apache License 2.0 | C++, epoll, Libuv, Boost Asio | C++, JavaScript, Node.js | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | memory-limited, configurable, server focused missing client support[21] |
| Boost.Beast[22] | Yes | Yes | 94 30 July 2017 |
RFC 6455 | Test report[23] | Boost | C++, Boost Asio | C++ | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | unlimited (packets streamed to user code), permessage-deflate also unlimited (chunked) |
| libwebsockets[24] | Yes | Yes | 2.4 16 Oct 2017 |
RFC 6455 + RFC 7692 | Test report[25] | LGPL2 + SLE | C, libuv, libev , libevent, poll, external poll loop integration, OpenSSL, mbedTLS | C, HTML5, JavaScript | Yes | Yes | Yes | Yes | Yes | Yes, yes | Yes | Yes | Yes | Yes | unlimited (packets streamed to user code), permessage-deflate also unlimited (chunked) |
| websocket++[26] | Yes | Yes | 0.8.2 20 Apr, 2020 |
RFC 6455 | BSD | C++11 | C++11 | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | |
| facil.io[27] | Yes | Yes | 0.7.1 18 May 2019 |
RFC 6455 | MIT | C | C | Yes | Yes | Yes | Yes | Yes | Yes, yes | Yes | Yes | Yes | Yes | configurable client to server limits. unlimited (chunked) server to client. | |
| oatpp-websocket[28] | Yes | Yes | 1.3.0 19 Nov 2021 |
RFC 6455 | Apache License 2.0 | C++11, Oat++ | C++11, Oat++ | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | unlimited (packets streamed to user code) |
Notes
- ^ a b Chromium website
- ^ a b Necko website
- ^ Achex WS website
- ^ Kaazing website
- ^ Lightstreamer website
- ^ MigratoryData website
- ^ Mongoose Library website
- ^ noPoll website
- ^ POCO C++ Libraries documentation
- ^ PowerWebSockets website
- ^ PowerWebSockets Autobahn|Testsuite report
- ^ QtWebSockets website
- ^ RingSocket (GitHub)
- ^ Caucho website
- ^ WebSocketListener website
- ^ wt website
- ^ XSockets.NET website
- ^ RIWA website
- ^ μWebSockets (GitHub)
- ^ μWebSockets Autobahn|Testsuite report
- ^ uWebSockets What would it take to implement a client? #1710
- ^ Boost.Beast (GitHub)
- ^ Beast.WebSocket Autobahn|Testsuite report
- ^ libwebsockets.org website
- ^ libwebsockets.org lws Autobahn|Testsuite report
- ^ websocket++ website
- ^ facil.io website
- ^ oatpp.io website
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