+# Set Header = If-Modified-Since: Thu, 04-Oct-07 09:56:35 GMT
+# Expect Header = SOME CHANGE
+# Set Header = If-Modified-Since: Thursday, 04-Oct-2007 09:56:35 GMT
+# Expect Header = SOME CHANGE
+# Set Header = If-Modified-Since: Thu, 04-Oct-2007 09:56:35 GMT
+# Expect Header = SOME CHANGE
+# Set Header = If-Modified-Since: Thursday Oct 04 09:56:35 2007 GMT
+# Expect Header = SOME CHANGE
+#
+# Set Header = If-Modified-Since: Thu, 1 Jan 1970 00:00:00 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+# Set Header = If-Modified-Since: Thu, 01-Jan-70 00:00:00 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+# Set Header = If-Modified-Since: Thursday, 01-Jan-1970 00:00:00 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+# Set Header = If-Modified-Since: Thu, 01-Jan-1970 00:00:00 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+# Set Header = If-Modified-Since: Thursday Jan 01 00:00:00 1970 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+#
+# Set Header = If-Modified-Since: Thu, 1 Jan 123456789 00:00:00 GMT
+# Expect Header = REMOVAL
+# Set Header = If-Modified-Since: Thu, 01-Jan-123456789 00:00:00 GMT
+# Expect Header = REMOVAL
+# Set Header = If-Modified-Since: Thursday, 01-Jan-123456789 00:00:00 GMT
+# Expect Header = REMOVAL
+# Set Header = If-Modified-Since: Thu, 01-Jan-123456789 00:00:00 GMT
+# Expect Header = REMOVAL
+# Set Header = If-Modified-Since: Thursday Jan 01 00:00:00 123456789 GMT
+# Expect Header = REMOVAL
+#
+# Set Header = If-Modified-Since: Mon, 1 Jan 2525 00:00:00 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+# Set Header = If-Modified-Since: Mon, 01-Jan-25 00:00:00 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+# Set Header = If-Modified-Since: Monday, 01-Jan-2525 00:00:00 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+# Set Header = If-Modified-Since: Mon, 01-Jan-2525 00:00:00 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+# Set Header = If-Modified-Since: Monday Jan 01 00:00:00 2525 GMT
+# Expect Header = SOME CHANGE
+# Level = 17
+#
+# Set Header = If-Modified-Since: Thu, 1 Jan 1970 02:00:00 GMT
+# Expect Header = SOME CHANGE
+# Set Header = If-Modified-Since: Thu, 01-Jan-70 02:00:00 GMT
+# Expect Header = SOME CHANGE
+# Set Header = If-Modified-Since: Thursday, 01-Jan-1970 02:00:00 GMT
+# Expect Header = SOME CHANGE
+# Set Header = If-Modified-Since: Thu, 01-Jan-1970 02:00:00 GMT
+# Expect Header = SOME CHANGE
+# Set Header = If-Modified-Since: Thursday Jan 01 02:00:00 1970 GMT
+# Expect Header = SOME CHANGE