Getting JSON Response from an REST POST - application/json

[Grove]

Hi,

I'm doing an REST POST call to an server with an application/json context.
The call is going alright but I can't get the response of it.
I already did try to get it on multiple different ways, but the I can't get the data.

const int available = reply->bytesAvailable();
           qDebug() << "bytesAvailable" << available;
            const QByteArray buffer = reply->readAll();
           QByteArray response_data = reply->readAll();
           qDebug()  << response_data;
           QJsonDocument json = QJsonDocument::fromJson(response_data);
           QJsonObject obj = json.object();
           qDebug()<<"view: " << obj["view"];
           qDebug() << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();

           QJsonDocument jsonDoc(QJsonDocument::fromJson(buffer));
           QJsonObject jsonReply = jsonDoc.object();

           QJsonObject respons1e = jsonReply["response"].toObject();
           QJsonArray  data     = jsonReply["data"].toArray();
           qDebug() << data;

The response of this is:

bytesAvailable 1024936
""
view:  QJsonValue(null)
200
QJsonArray()

The bytes data is available because be bytes are available.
Is there a way to to get the data?

Wkr,
Grove

[mrjj]

Hi
But how does the data look ?
const QByteArray buffer = reply->readAll();
qDebug() << buffer;

You call readAll() twice
const QByteArray buffer = reply->readAll();
QByteArray response_data = reply->readAll();
and it could be the reason that response_data is empty

[Grove]

@mrjj in the debug data this is printed.
It is an empty string.

[mrjj]

@grove
so the first readAll() for buffer also gives an empty string ?

[mrjj]

Hi
did you check out
https://forum.qt.io/topic/61771/qnetworkaccessmanager-and-post-return/
You are not showing all of the code so its unclear if you used signals and slots.

[saeidparand]

void Login::InsertApi(QString str)
{
QUrl serviceUrl = QUrl(str);
QNetworkRequest request(serviceUrl);
QJsonObject json; ;
json.insert("name", QString( "Amazing Pillow 92.10" ));
json.insert("price", QString( "199" ));
json.insert("description", QString( "The best pillow for amazing programmers." ));
json.insert("category_id", QString( "2" ));
json.insert("created",QString("2018-06-01 00:35:07"));
request.setHeader(QNetworkRequest::ContentTypeHeader,"application/x-www-form-urlencoded");
QNetworkAccessManager networkManager = new QNetworkAccessManager(this);
connect(networkManager,SIGNAL(finished(QNetworkReply)),this,SLOT(replyFinished(QNetworkReply*)));
networkManager->post(request,QJsonDocument(json).toJson());
qDebug() << "json:" << json;
}
/////////////
void Login::ReadAPI(QString api)
{
QNetworkRequest request(QUrl("http://192.168.1.104/ramona/employee/read.php"));
request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
QNetworkAccessManager *m_nam=new QNetworkAccessManager();
QNetworkReply *reply = m_nam->get(request);
connect(reply, &QNetworkReply::finished, this, [this, reply] {
reply->deleteLater();
const QJsonDocument doc = QJsonDocument::fromJson(reply->readAll());
const QJsonArray array = doc.array();
for (const QJsonValue &value : array) {
//qDebug() << value.toObject();
qDebug() << "EMPID:" << value.toObject().find("empId")->toString();
qDebug() << "NCODE:" << value.toObject().find("ncode")->toString();
qDebug() << "EMPCODE:" << value.toObject().find("empcode")->toString();
qDebug() << "STATUES:" << value.toObject().find("statues")->toString();
}
});
}

[mrjj]

Hi
did you try move
reply->deleteLater(); in ReadAPI(QString api)
to the end of the function. Its fishy to ask to delete it first and then use it after. ( even if valid)
The code looks ok.

[Grove]

@saeidparand I tried the QJSON part of your code but unfortunately this didn't solve a thing.

I have added some code to get the header. So now there is some more information to share:

QList<QByteArray> headerList = reply->rawHeaderList();
           foreach(QByteArray head, headerList) {
               qDebug() << head << ":" << reply->rawHeader(head);
           }

returns:

"Cache-Control" : "no-cache,no-store"
"Content-Type" : "text/plain"
"Transfer-Encoding" : "chunked"
"Content-Encoding" : "gzip"
"Vary" : "Accept-Encoding"
"Date" : "Sat, 24 Aug 2019 12:56:01 GMT"

[Grove]

by adding:

request.setRawHeader("Accept-Encoding", "gzip, deflate");

And executing:

QByteArray response = reply->readAll();
qDebug() << QString(response).toUtf8();

I now have some results:

"\x1F\xEF\xBF\xBD\b"

But how to deal with this?

[Grove]

I think I narrowed it down more...
I have tried more POST and GET requests on the server without any problems.
But when the response is gzip encoded and is chunked I can't get the JSON that it should return.

Can anybody help me with this?