Looking through the grails log, I see the following.
The request from the browser is being picked up

24 Mar 2017;09:50:40.737 DEBUG org.apache.coyote.http11.Http11InputBuffer - 
Received [GET /heroes?max=15 HTTP/1.1^M
Host: centos64:8080^M
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:52.0) 
Gecko/20100101 Firefox/52.0^M
Accept: application/json, text/plain, */*^M
Accept-Language: en-GB,en;q=0.5^M
Accept-Encoding: gzip, deflate^M
Referer: http://localhost:4200/dashboard^M
Origin: http://localhost:4200^M
DNT: 1^M
Connection: keep-alive^M

And then it finds the data
24 Mar 2017;09:50:42.299 DEBUG org.hibernate.engine.internal.Collections - 
Collection found: [heroes2.Publisher.heroes#1], was: 
[heroes2.Publisher.heroes#1] (initialized)
24 Mar 2017;09:50:42.299 DEBUG 
org.hibernate.event.internal.AbstractFlushingEventListener - Flushed: 0 
insertions, 0 updates, 0 deletions to 12 objects
24 Mar 2017;09:50:42.300 DEBUG 
org.hibernate.event.internal.AbstractFlushingEventListener - Flushed: 0 
(re)creations, 0 updates, 0 removals to 1 collections
24 Mar 2017;09:50:42.300 DEBUG org.hibernate.internal.util.EntityPrinter - 
Listing entities:
24 Mar 2017;09:50:42.300 DEBUG org.hibernate.internal.util.EntityPrinter - 
heroes2.Hero{flight=false, invulnerable=false, strength=false, city=null, 
name=Iron Man, publisher=null, id=11, version=0}
etc etc

But then I get an error

24 Mar 2017;09:50:42.305 DEBUG 
org.grails.web.servlet.mvc.GrailsWebRequestFilter - Cleared Grails 
thread-bound request context: 
org.apache.catalina.connector.RequestFacade@1ae7a41a
24 Mar 2017;09:50:42.381 DEBUG org.apache.coyote.http11.Http11Processor - 
Error parsing HTTP request header
java.io.EOFException: null
        at 
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1222)
        at 
org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.read(NioEndpoint.java:1163)
        at 
org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:742)
        at 
org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:404)
        at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:994)
        at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
        at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
24 Mar 2017;09:50:42.382 DEBUG org.apache.coyote.http11.Http11Processor - 
Socket: 
[org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@564d6ef5:org.apache.tomcat.util.net.NioChannel@49642f0f:java.nio.channels.SocketChannel[connected
 
local=/192.168.1.81:8080 remote=/192.168.1.71:50944]], Status in: 
[OPEN_READ], State out: [CLOSED]
24 Mar 2017;09:50:42.382 DEBUG org.apache.tomcat.util.threads.LimitLatch - 
Counting down[http-nio-8080-exec-2] latch=1


And I am not sure what causes that.

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