GetOptions httpOptions = new GetOptions();
if (from.getIfMatch() != null) {
httpOptions.ifETagMatches(from.getIfMatch());
}
if (from.getIfModifiedSince() != null) {
httpOptions.ifModifiedSince(from.getIfModifiedSince());
}
if (from.getIfNoneMatch() != null) {
httpOptions.ifETagDoesntMatch(from.getIfNoneMatch());
}
if (from.getIfUnmodifiedSince() != null) {