How do you write a custom middleware?

Create a class with:

• A constructor accepting RequestDelegate
• An Invoke or InvokeAsync method

public class MyCustomMiddleware

private readonly RequestDelegate _next;

public MyCustomMiddleware(RequestDelegate next) => _next =

next;

public async Task InvokeAsync(HttpContext context)

// Pre-processing logic

await _next(context);

// Post-processing logic

Register it:

app.UseMiddleware<MyCustomMiddleware>();