Why a middleware does not get executed if applied after app.UseEndpoints() in ASP.NET Core Web APIs

Question

I am trying to create a middleware that should execute after the execution of endpoint. But when I add middleware in after the app.UseEndPoints(), it never gets invoked, however it is invoked if placed before app.UseEndPoints(), but that invokes it before execution of endpoint.

I tried to create a middleware, I placed if after app.UseEndPoints() middleware in the Configure method in the Startup class and expected it to be invoked after the execution of the endpoint (Web APIs action method), but it did not get invoked.

EndPoints is the key word here. Those are terminal middlewares, nothing gets passed on after them. You need to add the middleware before the endpoints and handle whatever it is as the response is being sent after your endpoints execute (the // Logic After in Shahar's answer). — Valuator
– Valuator, Commented Feb 7, 2024 at 17:40
This smells like an X-Y problem. What are you actually trying to do? — Ian Kemp - SO dead by AI greed
– Ian Kemp - SO dead by AI greed, Commented Feb 7, 2024 at 18:27

Shahar Shokrani · Accepted Answer · 2024-02-07 17:29:52Z

3

How is your middleware looks like? looks like a code smell (maybe divide it into two middlewares).

In the meantime, you can easily divide the logic into two sections:

public async Task InvokeAsync(HttpContext context)
{
    // Logic Before

    await _next(context);

    // Logic After
}

Then the // Logic After will be exectute after the invocation UseEndpoints

edited Feb 7, 2024 at 17:29

answered Feb 7, 2024 at 17:12

Shahar Shokrani

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