Developing middleware for request modification

Middleware in web applications serves as a powerful tool for processing requests. Custom middleware can intercept and modify these messages, allowing developers to add or modify functionalities.

In this recipe, we’ll focus on developing custom ASGI middleware to modify responses before they are sent to the client by hashing the body of each request, if necessary. This approach provides the flexibility to add or change response headers, body content, and other properties dynamically. By the end of the recipe, you will be able to develop custom middleware to control every API request.

Getting ready

Before we begin, please make sure you have completed the previous recipe, Creating custom ASGI middleware, to create specific custom ASGI middleware. We will be working on the middleware_project application, but the recipe can easily be applied to any application.

Before creating the middleware, in the main.py module, let’...