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java.lang.IllegalArgumentException: 	at org.apache.catalina.connector.Response.normalize(Response.java:1794)	at org.apache.catalina.connector.Response.toAbsolute(Response.java:1714)	at org.apache.catalina.connector.Response.encodeRedirectURL(Response.java:1194)	at org.apache.catalina.connector.ResponseFacade.encodeRedirectURL(ResponseFacade.java:417)	at org.apache.wicket.protocol.http.WebResponse.redirect(WebResponse.java:210)	at org.apache.wicket.protocol.http.BufferedWebResponse.close(BufferedWebResponse.java:67)	at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:502)	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:319)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at edu.colorado.phet.website.services.URLFilter.doFilter(URLFilter.java:64)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)	at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:683)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)	at org.apache.coyote.ajp.AjpAprProcessor.process(AjpAprProcessor.java:188)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2440)	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2429)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:745)