The Sec-WebSocket-Accept header is important in that the server must derive it from the Sec-WebSocket-Key that the client sent to it. The client can solicit extensions and/or subprotocols here; see Miscellaneous for details. Also, common headers like User-Agent, Referer, Cookie, or authentication headers might be there as well. Do whatever you want with those; they don’t directly pertain to the WebSocket. In many common setups, a reverse proxy has already dealt with them. This means that you don’t have to bloat your server code with cookie and authentication handlers (for example).

The new WebSocket method is the exposed API method that returns an established connection with the URL specified as the first parameter and adheres to an optional protocol parameter. Rather,
I will cover the most important bits so that we can gain an understanding
of the WebSocket protocol. When you get a ping, send back a pong with the exact same Payload Data as the ping (for pings and pongs, the max payload length is 125). You might also get a pong without ever sending a ping; ignore this if it happens. A WebSocket server can be written in any server-side programming language that is capable of Berkeley sockets, such as C(++), Python, PHP, or server-side JavaScript. This is not a tutorial in any specific language, but serves as a guide to facilitate writing your own server.

What is a WebSocket connection?

Once one party breaks the connection, the second party won’t be able to communicate as the connection breaks automatically at its front. The best use-case of WebSocket is when you need real-time data really quick, like stock prices. So, using HTTP would waste crucial time in unnecessary handshaking, and the quotes would get stale. Contrarily, if you can afford a delay of a few milliseconds in the information you seek, you must go for HTTP.

what is websocket used for

This allows the users to maintain an open line of communication where they constantly receive the latest information. WebSockets enable real-time messaging apps like Telegram and WhatsApp to create streamlined messaging communications for their millions of users. Think of playing Apex Legends, Fortnight, or your favorite multiplayer game. If you do not have real-time data enabled by WebSockets technology, you will probably not fare very well in a head-to-head battle! Multiplayer games let people from all over the world play together.


The WebSocket object provides the API for creating and managing a WebSocket connection to a server, as well as for sending and receiving data on the connection. In addition to enabling real-time messaging, it can implement advanced features in chat applications such as file sharing, video and audio calls, and screen sharing. These features can be implemented in real-time without additional software or plugins.

what is websocket used for

If you are using Google Maps to, e.g., make your road trip easy to navigate, what would that be like without real-time data? As you drive across Europe from Paris to Rome and get closer to your destination, you want the most accurate, real-time information. Once you cruise into Florence, you do not want instructions for driving from Paris. You want the latest possible information, such as how to get from Florence to Rome! Most drivers today enjoy real-time data when journeying to any destination, thanks to technologies like WebSocket.

What WebSocket Integration means for Moralis

Some potential risks include man-in-the-middle attacks, cross-site scripting (XSS) attacks, and injection attacks. To mitigate these risks, developers should implement proper security measures, such as encryption, authentication, and input validation. WebSocket uses a unified TCP connection and needs one party to terminate the connection. Once the request is completed, the connection breaks automatically. As per the conventional definition, WebSocket is a duplex protocol used mainly in the client-server communication channel. It’s bidirectional in nature which means communication happens to and fro between client-server.

what is websocket used for

WebSocket connections enable streaming of text strings and binary data via messages. Long polling provides fast communication in many environments and is widely used, often as opposed to true push-based methods like WebSocket connections or Server Side Events (SSE). Long polling can seem intensive on the server side, as it requires continuous resources to hold a connection open, but it uses much less than repeatedly sending polling requests. To ensure safety, you can use the WSS protocol in all three significant applications.

  • To conclude, WebSockets are a very useful protocol for building real-time functionality across web, mobile, and desktop variants, but they are not a one-size-fits-all approach.
  • These features can be implemented in real-time without additional software or plugins.
  • As you drive across Europe from Paris to Rome and get closer to your destination, you want the most accurate, real-time information.

WebSocket uses the WS protocol, which is based on the Transmission Control Protocol (TCP). It is a connection-oriented network, meaning a connection between participants has to be established first to route data through to the right location. Websockets have communication occurring on both ends, because of which it is a faster protocol than HTTP, in which the connection is built at one end, making it a bit slower than WebSocket. A websocket connection does happen to be functionally similar to standard Unix-style sockets, they are not related.