location /redis {
        internal;

        redis2_query get $request_uri;
        set_unescape_uri $query $arg_query;

        redis2_raw_query $query;
        redis2_pass 127.0.0.1:6379;
}

location / {
        content_by_lua '
                local res = ngx.location.capture("/redis",
                        { args = { query = "$request_uri\\r\\n" } }
                )
                local href = string.gsub(res.body, "\$[0-9]+\\r\\n", "");
                ngx.redirect(href);
        ';
}