Header based routing in ASP.NET Core Minimal API

Question

I'm looking for a way to have multiple routes in my ASP.NET Core which differ by a certain header. I found this question which answers the same question BUT for a controllers-based API: Header based routing in ASP.NET Core

I'm looking for the same thing, but for a Minimal APIs. I found this (https://learn.microsoft.com/en-us/aspnet/core/fundamentals/routing?view=aspnetcore-8.0#route-constraints) describing custom route constraints, but I don't really care about any parameters (my path actually doesn't have any) so I don't know how to use it.

How many routes are we talking here? If it's just a handful then you're better-off having a single "normal" Action/Handler or Middleware func that inspects the request header and simply makes a direct method-call - it really isn't worth the effort to get into the ductwork of ASP.NET's infra unless the effort-to-reward ratio is there (though if you're wanting to do it for learning reasons or for a challenge, that's different - I assume you're just wanting to do things properly but your boss/client would rather you shipped something sooner, even if internally it's not pretty to look at. — Dai
– Dai, Commented Aug 11, 2024 at 12:26
(I wryly note that "Minimal API" in ASP.NET Core started-off as an attempt to lower-the-barier-of-entry for ASP.NET to avoid overwhelming newcomers with the Startup ceremony - but now it's a meaningless buzzword because using "Minimal API" does nothing to help prevent projects of nontrivial complexity ending up as a hot mess after spending 5-6 years in prod, or worse: handing it off to a 1st-year intern) — Dai
– Dai, Commented Aug 11, 2024 at 12:29
You're right it's just a few routes and I already spent more time with it than is justifiable 😅 but Im taking it as a learning opportunity — Tomáš Bezouška
– Tomáš Bezouška, Commented Aug 13, 2024 at 7:48

Jerry Fu · Accepted Answer · 2024-08-12 09:01:07Z

1

Following code works to map minimal endpoints conditionally.

app.UseRouting();
app.MapWhen(context => context.Request.Headers["route"]=="A", (appBuilder) =>
{
    appBuilder.UseEndpoints(endpoints =>
    {
        endpoints.MapGet("A", () => { return "A result"; });
    });
});

answered Aug 12, 2024 at 9:01

Jerry Fu

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