WildFly (Undertow) fails to include jsp static content when "If-Modified-Since" header is used ---------------------------------------------------------------------------------------------- Key: WFLY-4817 URL: https://issues.jboss.org/browse/WFLY-4817 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 9.0.0.CR2 Reporter: Marco Mondini Assignee: Stuart Douglas Fix For: 9.0.1.Final, 10.0.0.Alpha6 WildFly (Undertow) doesn't correctly include static content in jsp when tag is used in combination of "If-Modified-Since" header as per https://issues.jboss.org/browse/UNDERTOW-476. Upgrading Undertow to version 1.2.9.Final will fix the issue.