The push and pull protocols govern the data transfer or communication between the client and server. These techniques are essential for app developers since they enable data retrieval functionalities in their apps. Application Programming Interface (API) is the driving force behind data transport. Let's summarize these data delivery techniques:
Push API
In this approach, the client connects to the server and stays active continuously. The client can request and receive data consistently. It is similar to an online multiplayer streaming game.
The server uses a persistent, bi-directional connection to "push" the data to the client. As the server gets the data update, it immediately delivers it to the client.
The FIX protocol, WebSockets, and SocketIO are some of the top push API examples.
Pull API
With the pull protocol, the client establishes a connection with the server, requests the desired information, and the server responds with the necessary data after validating and processing the request.
As a result, the client uses a unidirectional connection to "draw" the necessary data from the server. A new connection will be required each time the customer requests data. This is similar to a vending machine where the customer must request precise information.
An HTTP Get Request is a practical example of a pull-based API.
These characteristics make the Pull protocol preferable for acquiring static data already present on the server and the Push protocol appropriate for obtaining streaming data.
Do you want to learn more about the differences between various data distribution techniques, their practical applications, advantages, and disadvantages? I advise you to read the latest article Push Vs. Pull Forex Data, which describes these strategies from the perspective of market data.
