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I haven't read the spec for what it says about relative paths like ../. However, if it was working in previous JBoss AS or JBoss EAP versions, then you might want to create a JIRA for WildFly here WildFly - JBoss Issue Tracker and attach the sample application along with some details. WildFly 8 uses a new web server Undertow http://undertow.io/ and it's possible you might have found a bug.
By the way, before filing the JIRA please try this against the recently released 8.1.0.CR1 Downloads · WildFly and see if it works there.