ASP.NET Core 中的手动内容协商

Question

Is it possible to access the methods that ASP.NET Core uses to negotiate content?

For example, I would expect a method that does:

var acceptHeader = "text/*, text/html, text/html;level=1, */*";
var candidates = new[] { "image/png", "text/plain" };
var preferred = Negotiate(candidates, acceptHeader) // returns text/plain.

I found a library that does it. As ASP.NET Core is doing content negotiation behind the scenes I would prefer to use .NET Core methods to avoid adding a new library to the project.

Answer 1

You can build your own middleware component to achieve this goal.

public async Task Invoke(HttpContext context)
{

  Negotiate(context);
  await _next(context);
}

And don't forget to register your middleware

services.AddScoped<IMiddleware, SomeMiddleware>();