private Message handleRequestWithIfMatch(Request request) throws IOException {
final Path path = Path.fromString(request.uri().getPath());
final Resource resource = resolveResource(path);
final String ifMatch = getOnlyElement(request.headers().get(Header.IF_MATCH));
if (ifMatch.equals("*") || !ifMatch.equals(resource.etag())) {
return handleRequestWithoutIfMatch(request);
} else {
return Response.clientErrorPreconditionFailed();
}
}
