Fix flaky StatisticsHandlerTest

[lorban]

As explained here, StatisticsHandlerTest currently can run in parallel with DistributionTests.

Fixes #13094

[olamy]

Why cannot run in parallel?
Distribution tests are separate jvm.

[sbordet]

@lorban, I agree with @olamy: there should not be interaction as they are different JVMs.

[lorban]

I wanted to try this out to see if it helps, as this failure isn't locally reproducible and it happens at a weird time: during create-startd.

@joakime spoke about DistributionTests.testHTTP2ClientInCoreWebAppProvidedByServer failures being caused by jetty.org being down. I wonder if the same problem could impact testWebAppWithProxyAndJPMS and StatisticsHandlerTest?

[olamy]

Should we mark those tests as external?
Or during distribution testing just start a simple docker Nginx and "hit" it instead of webtide.com or some javadoc?

[sbordet]

Why would we need to access jetty.org? For XML DTD download? We should have those locally.

[olamy]

Why would we need to access jetty.org? For XML DTD download? We should have those locally.

not sure it;s related to DTD but simply hitting webtide.com see test webapp code used by the distribution test:

jetty.project/jetty-core/jetty-tests/jetty-test-http2-client-transport-provided-webapp/src/main/java/org/eclipse/jetty/test/http2/client/transport/provided/HTTP2ClientTransportProvidedHandler.java

Line 43 in e02e399

httpClient.newRequest("https://webtide.com/")