@Override
    public void fetch(Handler<Buffer> resultHandler) {
        vertx.fileSystem().readFile(uri.getPath(), result -> {
            if (result.succeeded()) {
                resultHandler.handle(result.result());
            } else {
                exceptionHandler.handle(result.cause());
            }
        });
    }
Fetch a file from the local filesystem.

@author Marc Savy {@literal <marc@rhymewithgravy.com>}
gateway/engine/vertx-polling/src/main/java/io/apiman/gateway/engine/vertx/polling/fetchers/FileResourceFetcher.java