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java.lang.NoSuchMethodError: javax.servlet.http.HttpServletResponse.getHeaders(Ljava/lang/String;)Ljava/util/Collection;	at spark.utils.GzipUtils.checkAndWrap(GzipUtils.java:64)	at spark.webserver.MatcherFilter.doFilter(MatcherFilter.java:251)	at spark.webserver.JettyHandler.doHandle(JettyHandler.java:61)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)	at org.eclipse.jetty.server.Server.handle(Server.java:517)