HttpRequest JSON string truncated

[Hesh]

I am creating objects on client side and trying to save them on the server side. 

However, I find that the JSON string sent from the client side is truncated when received on the server side, and is never more than 582 characters in length.

I am wondering why, and what can be done to send data longer than 582 characters?

My code below is adapted from Chris Buckett's tutorial (https://www.dartlang.org/articles/json-web-service/)

On the client end:

save() {

  HttpRequest request = new HttpRequest(); 

  request.withCredentials = true;

  request.onReadyStateChange.listen((_) {

    if (request.readyState == HttpRequest.DONE && (request.status == 200 || request.status == 0)) {

      print(request.responseText);

    }

  });

  var objAsMap = toMap(myObject); //creates a map from dart object

  var objAsJson = JSON.stringify(objAsMap);

  var url = "http://127.0.0.1:5555/save";

  request.open("POST", url, async: true);

  request.send(objAsJson);

}

On server side:

void handlePost(HttpRequest req) {

  HttpResponse res = req.response;

  req.listen((List dat) {

  String buffer = UTF8.decode(dat);

    print ("buffer length: ${buffer.length}"); // <== Never more than 582

save(buffer).then((_) => res.close());

  },

  onError: printError);

}

Thanks,

Hesh

[Anders Johnsen]

Hi Hesh,

The problem you are having, is that you don't wait for all data to arrive on the server. When you listen on a HttpRequest, the data will arrive in chunks, and it's not until 'onDone' on the stream is called, that all data is received. The following should do it for you:

void handlePost(HttpRequest req) {

  HttpResponse res = req.response;

  var buffer = new StringBuffer();

  req.transform(UTF8.decoder)

    .listen((String data) => buffer.write(data),

            onDone: () {

              print ("buffer length: ${buffer.length}"); // <== Print full length

save(buffer.toString()).then((_) => res.close());

            },

            onError: printError);

}

Cheers,

- Anders

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[Hesh]

Perfect! Worked like a charm.

Thanks, Anders.

- Hesh