grails 3.3.10 not timing out after setting server.connection-timeout

Question

We are trying to diagnose a timeout issue, by trying to set the server.connection-timeout in application.yml

To explore solutions, we first try to cause a connection timeout. The idea is to set the timeout to 10s and cause a timeout in a GSP page. However, we find that we are unable to cause the server timeout, by modifying the index.gsp and adding a Thread.sleep(20000).

Replication instructions:

• Create a grails appliction from grails forge:

  curl -O start.grails.org/timeout.zip -d version=3.3.10 -d features=events,geb,hibernate5,json-views
  

• Modify application.yml

  server:
      connection-timeout: 10000
  

• Add a sleep loop in index.jsp

  <%
      Thread.sleep(20000)
  %>
  

• load up the default page of the application upon startup

Notes:

• By debugging the Tomcat lifecycle, I can see that the embedded servlet container is assigned the 10000ms configuration during initialization.
• If I change the sleep loop to 65s, I still don't get a timeout. Most of the documentation mentions that the default value is the 60s)