Developing middleware for response modification

Besides processing requests, middleware in web applications is also a powerful tool for processing responses. Custom middleware allows us to intercept responses before they are returned to the API caller. This can be useful for checking response content or personalizing the response. In this recipe, we will develop custom ASGI middleware to add customized headers to all the responses.

Getting ready

We will be creating custom ASGI middleware that modifies the response of each HTTP call. Before we get started on this recipe, take a look at the Creating custom ASGI middleware recipe. Also, this recipe will be complementary to the previous recipe, Developing middleware for request modification.

While you can apply this recipe to your own project, we will continue working on the middleware_project project that we initialized in the Developing middleware for request modification recipe.

How to do it…

We will create our...