ASP.NET Core 3 and React

Custom middleware

We can create our own middleware using a class such as the following one. This middleware logs information about every single request that is handled by the ASP.NET Core app:

public class CustomLogger{    private readonly RequestDelegate _next;    public CustomLogger(RequestDelegate next)    {        _next = next ?? throw new ArgumentNullException(nameof(next));    }    public async Task Invoke(HttpContext httpContext)    {        if (httpContext == null) throw new         ArgumentNullException(nameof(httpContext));        // TODO - log the request        await _next(httpContext);        // TODO - log the response     }}

This class contains a method called Invoke, which is the code that is executed in the request/response pipeline. The next method to call in the pipeline is passed into ...