This makes them suitable for a wide range of applications that require real-time data exchange. WebSocket demands the use of a client-picked random key for all the payload data. Masking key, when combined with payload data, assists payload data sharing in an XOR operation. Doing so holds great importance from the application API security as masking keeps cache misinterpreting or cache poisoning at bay. Speaking of its utility, it’s the spine for modern web application development when seamless streaming of data and assorted unsynchronized traffic is concerned. As per the conventional definition, WebSocket is a duplex protocol used mainly in the client-server communication channel.
There is traditionally no mechanism for the server to initiate communication with the client. The server is unable to send data to the client unless the client requests it first. This can create issues for use cases where messaging needs to go out in real time from the server side. But as with all applications, using WebSocket entails both careful programming practices and run-time protection to guard against a unique set of threats. This API defense-in-depth strategy will improve protection for both your users and your organization compared to traditional approaches.
WebSockets – Communicating with Server
When the connection is established and alive the communication takes place using the same connection channel until it is terminated. The WebSocket protocol offers persistent, real-time, full-duplex communication between the client and the server over a single TCP socket connection. In contrast, a unidirectional protocol like HTTP only allows for the client to request data from the server. Chat apps are one of the most commonly used applications, but with HTTP someone would need to initiate a request to know whether there is an update. With WebSocket, updates can happen in real-time, making WebSocket popular among chat application developers. HTTP communication is a unidirectional communication between a web client and a web server.
WebSockets are asynchronous by design, meaning that data can be sent and received at any time, without blocking or waiting for a response. Note that the WebSocket protocol doesn’t prescribe any particular way for servers to authenticate clients. For example, you can handle authentication during the opening handshake, by using cookie headers. Another option what is websocket used for is to manage authentication (and authorization) at the application level, by using techniques such as JSON Web Tokens. Before a client and server can exchange data, they must use the TCP (Transport Control Protocol) layer to establish the connection. WebSockets effectively run as a transport layer over the TCP using their own websocket protocol.
This great piece for getting started with WebSocket.
Alchemy Notify can even be used to send email notifications to your dApp users, preventing frustration on the status of their transactions. Lastly, whether one is trying to bridge a server with another server or a client and a server matters too; webhooks are better for the former, WebSockets for the latter. If the quantity of notifications being sent is low, webhooks are also superior in that the connections are begun only on the condition of an event happening. Alchemy Notify uses webhooks to communicate between servers and WebSockets to push the notifications that the dApp user sees. WebSocket by itself does not include reconnection, authentication and many other high-level mechanisms.