How to send a FileReferense with parameters to the server in Flash(Flex) and get a response?

Question

Apache Flex

Hello. In general, there was a need to build one little thing on Flash (Flex). It's just a button, when you click on which the user selects a file, this file is sent to the server with additional parameters like userID and in response receives a link to this file. In general, I received the file through FileReference.browse(), but I don’t know how to send it now with parameters, and even get an answer right away, I tried a bunch of everything. Maybe someone is familiar with Flash (Flex) more than my one day. Thank you.
UPD:
Just send a file with parameters, it turns out:

var request:URLRequest = new URLRequest("http://192.168.0.104:7080/uploadfile");
  var variables:URLVariables = new URLVariables();
  var header:URLRequestHeader = new URLRequestHeader( "enctype", "multipart/form-data" );
  request.requestHeaders.push(header);
  equest.method = URLRequestMethod.POST;
  variables.user = "Some user";
  request.data = variables;
  file.upload(request, 'file');

Question how to get an answer
UPD:
Found events for FileReference , namely complete and uploadCompleteData. The first should work just with a 200 response status, and the second when receiving data from the server. The first event fires, but there is no data there (and should not be, as I understand it), but the second stupidly does not work at all, although I send the data. I googled, in general, this is a common mistake of the flash itself =\ I don’t know what to do. Are there other options or workarounds? Making another request after the complete event somehow doesn't smell very good.

Answer 1

Strangely, the DataEvent.UPLOAD_COMPLETE_DATA event has always worked in my practice.
Is there a possibility that the error is on the server side?
If not, you can try sending via URLLoader