Clojurians Log v2

First time using pedastal and having a rather fundamental issue which I can't get working properly. Based on this: http://pedestal.io/pedestal/0.6/guides/hello-world-content-types.html, I want to have a different content in the response based on the content negotation. The content negotation seems to fail (I'm trying to make the interceptors global, not route-specific). With this code:

(def routes
  (route/expand-routes
   #{["/api/hello" :get respond-hello :route-name :hello]}))

(def debug-content-negotiation
  {:name ::debug-content-negotiation
   :enter
   (fn [context]
     (println "Before negotiation: " (:request context))
     context)})


(def service
  (http/create-server
   {::http/routes routes
    ::http/type :jetty
    ::http/port 8080
    }))

I do get the expected output (`Hello, world!`).

curl -i -H "Accept: text/html" 

HTTP/1.1 200 OK
Date: Sat, 25 Jan 2025 14:00:11 GMT
Strict-Transport-Security: max-age=31536000; includeSubdomains
X-Frame-Options: DENY
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Content-Security-Policy: object-src 'none'; script-src 'unsafe-inline' 'unsafe-eval' 'strict-dynamic' https: http:;
Content-Type: text/plain
Transfer-Encoding: chunked

Hello, world!

With a debug-content-negotiation interceptor:

(def debug-content-negotiation
  {:name ::debug-content-negotiation
   :enter
   (fn [context]
     (println "Before negotiation: " (:request context))
     context)})


(def service
  (http/create-server
   {::http/routes routes
    ::http/type :jetty
    ::http/port 8080
    ::http/interceptors       [debug-content-negotiation]
    }))

I do get an empty result:

curl -i -H "Accept: text/html" 

HTTP/1.1 200 OK
Date: Sat, 25 Jan 2025 14:02:53 GMT
Content-Length: 0

When activating the content negotation:

(def service
  (http/create-server
   {::http/routes routes
    ::http/type :jetty
    ::http/port 8080
    ::http/interceptors       [(content-negotiation/negotiate-content supported-types)]
    }))

I get an internal server error:

curl -i -H "Accept: text/html" 

HTTP/1.1 500 Server Error
Date: Sat, 25 Jan 2025 13:49:19 GMT
Content-Type: text/plain
Transfer-Encoding: chunked

Internal server error: no response

What I expect to happen is that the enter-functions of the global interceptors are executed (as long as there's on response in the context), the function of the get of the hello route is executed (generating a body) and than the interceptor leave-functions are executed (in reverse order). I don't really understand where the 'no response' is coming from. It seems, when I add interceptors, the response-hello function isn't executed for some reason. What do I miss?