java.lang.IllegalArgumentException: Bad date header: 'Mon, 20 Jul 2015 02:57:15 GMT'

at weblogic.servlet.internal.ServletRequestImpl.getDateHeader(ServletRequestImpl.java:983)

at javax.servlet.http.HttpServletRequestWrapper.getDateHeader(HttpServletRequestWrapper.java:83)

at uk.ltd.getahead.dwr.impl.FileProcessor.isUpToDate(FileProcessor.java:118)

at uk.ltd.getahead.dwr.impl.FileProcessor.doFile(FileProcessor.java:50)

at uk.ltd.getahead.dwr.impl.DefaultProcessor.handle(DefaultProcessor.java:85)

Truncated. see log file for complete stacktrace

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