As the number of APIs that need to be integrated increases, managing the complexity of API interactions becomes increasingly challenging. By using the API gateway, we can create a sequence of API calls, which breaks down the API workflows into smaller, more manageable steps. For example, in an online shopping website when a customer searches for a product, the platform can send a request to the product search API, then send a request to the product details API to retrieve more information about the products. In this article, we will create a custom plugin for Apache APISIX API Gateway to handle client requests that should be called in sequence.

What Is a Chaining API Request, and Why Do We Need It?

Chaining API requests (or pipeline requests, or sequential API calls) is a technique used in software development to manage the complexity of API interactions where software requires multiple API calls to complete a task. It is similar to batch request processing where you group multiple API requests into a single request and send them to the server as a batch. While they may seem similar, a pipeline request involves sending a single request to the server that triggers a sequence of API requests to be executed in a defined order. Each API request in the sequence can modify the request and response data, and the response from one API request is passed as input to the next API request in the sequence. Pipeline requests can be useful when a client needs to execute a sequence of dependent API requests that must be executed in a specific order.

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