} catch (IllegalArgumentException iae){
// An 'If-Modified-Since' header is present but the value
// can not be parsed; ignore it.
final LogRef log = Activator.log;
if (null!=log && log.doDebug()) {
log.debug("Ignoring broken 'If-Modified-Since' header: "
+iae.getMessage(), iae);
}
}
response.setDateHeader("Last-Modified", date);
}