Date function ( ) { return this . ifUnmodifiedSince ; }
for use in the header if-unmodified-since return the object only if it has not been modified since the specified time , otherwise return a 412 precondition failed . concode_field_sep List<String> ranges concode_elem_sep Date ifUnmodifiedSince concode_elem_sep Date ifModifiedSince concode_elem_sep String ifNoneMatch concode_elem_sep GetOptions NONE concode_elem_sep String ifMatch concode_field_sep GetOptions ifETagMatches concode_elem_sep GetOptions ifETagMatches concode_elem_sep GetOptions tail concode_elem_sep String getIfMatch concode_elem_sep List<String> getRanges concode_elem_sep GetOptions ifUnmodifiedSince concode_elem_sep GetOptions ifUnmodifiedSince concode_elem_sep GetOptions ifETagDoesntMatch concode_elem_sep GetOptions ifETagDoesntMatch concode_elem_sep GetOptions range concode_elem_sep GetOptions range concode_elem_sep GetOptions ifModifiedSince concode_elem_sep GetOptions ifModifiedSince concode_elem_sep String getIfNoneMatch concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep String toString concode_elem_sep GetOptions startAt concode_elem_sep Date getIfModifiedSince