on using transform 'm getting error

[rukmanidevi-bh]

function appenderTransform(appendText) {
return {
name: 'appender',
transform: function() {
return through2(function(chunk, enc, cb) {
console.log(chunk);
this.push(chunk + appendText);
cb();
});
}
}
}

proxy({
url: "/abc",
timeout: parseInt(req.headers.timeout) || DEFAULT_TIMEOUT,
originalQuery: req.originalUrl.indexOf("?") >= 0,
transforms :[appenderTransform('XYZ')]
})(req, res, next);

I'm getting this error:
Error: aborted
at connResetException (node:internal/errors:691:14)
at TLSSocket.socketCloseListener (node:_http_client:407:19)
at TLSSocket.emit (node:events:402:35)
at node:net:687:12
at TCP.done (node:_tls_wrap:580:7)
at TCP.callbackTrampoline (node:internal/async_hooks:130:17)