Creating custom middleware for adding security headers

In this recipe, we will create custom middleware to add specific security headers to our API responses. These security headers protect against common web vulnerabilities such as clickjacking, MIME-type confusion attacks, cross-site scripting (XSS), and unauthorized content injection, thereby enhancing the overall security posture of the application.

Getting ready

The starter project for this recipe can be found here: https://github.com/PacktPublishing/ASP.NET-9-Web-API-Cookbook/tree/main/start/chapter04/SecurityHeaders

This recipe picks up where the preceding one left off.

How to do it…

1. In the Middleware folder, create the AddHeadersMiddleware.cs file in a class called AddHeadersMiddleware. Create the skeleton for the class:

   public class AddHeadersMiddleware
   {
       private readonly RequestDelegate _next;
       public AddHeadersMiddleware(RequestDelegate next)
    ...