[SOLVED] HTTP POST failed

[moravas]

Hi Folks,

I would like to send HTTP POST request via Qt framework with additional data. This is my code:
req.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-stream");
_networkManager.post(req, data);

but the remote pair doesn't get data holds by "data" member. I tried to send same request via another, third party application, and in this case, the server receives everything,

Can anybody help me, what did I wrong?

Regards,
Norbert

[mcosta]

Hi,

could you show how you build data and req?
Is the event loop active?

More code you show more help we can give you

[moravas]

Hi,

sorry for the late reply, I was quite busy
the data is coming from the call:
QString(QString::number(rowIndex, 16) + '=' + QString::number(state)).toUtf8();
so as you can see, there is a string and query its UTF8 representation.

the request is created as:
QNetworkRequest req(url);
where the url:
const QUrl url("http://192.168.1.10:80/host/0x00");

I see on the server side that the header of the request is arrived:
GET /host?0x03=0 HTTP/1.1
Connection: Keep-Alive
Accept-Encoding: gzip, deflate
Accept-Language: hu-HU,en,*
User-Agent: Mozilla/5.0
Host: 192.168.1.10:80

but, as you can see, there is no content.

can anybody help me?

Regards,
Norbert

Update:

I create a real minimal program, which one the issue is reproducible:
QNetworkAccessManager manager;
const QUrl url("http://192.168.1.10:80/host/0x00");
QNetworkRequest req(url);
req.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-stream");
manager.post(req, QString("1=1").toUtf8());

On the server side, the output:
POST /host/0x00 HTTP/1.1
Content-Type: application/octet-stream
Content-Length: 3
Connection: Keep-Alive
Accept-Encoding: gzip, deflate
Accept-Language: hu-HU,en,*
User-Agent: Mozilla/5.0
Host: 192.168.1.10:80

Please note, that the double new line is there at the end of the frame.

Can anybody help me?

Regards,
Norbert

[SGaist]

Hi,

What does your server expect exactly ?

Did you compare the content of the request made by your third party software and the one you make with Qt ?

[moravas]

Hi,

so, what the Qt sends:
POST /host/0x00 HTTP/1.1
Content-Type: application/octet-stream
Content-Length: 3
Connection: Keep-Alive
Accept-Encoding: gzip, deflate
Accept-Language: hu-HU,en,*
User-Agent: Mozilla/5.0
Host: 192.168.1.10:80

Please consider that the content length is filled out correctly, but there is no content.
What the server expect:
POST /host/0x00 HTTP/1.1
Content-Type: application/octet-stream
Content-Length: 3
Connection: Keep-Alive
Accept-Encoding: gzip, deflate
Accept-Language: hu-HU,en,*
User-Agent: Mozilla/5.0
Host: 192.168.1.10:80

1=1

Please consider the data record at the end of the request.

Regards,
Norbert

[SGaist]

Can you share the real code you use ? The last one looked like using only local variable which might get destroyed before everything is done.

[moravas]

Hi,

I wrote a really minimal test code, where I can verify it (sorry, on this new portal, I don't know, how can I highlight the code):

QByteArray data(QString("1=1").toUtf8());
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

QNetworkAccessManager manager;
const QUrl url("http://192.168.1.10:80/host/0x00");
QNetworkRequest req(url);
req.setHeader(QNetworkRequest::ContentTypeHeader, "application/octet-stream");
manager.post(req, data);

return a.exec();

}

AS you can see, I'm using globally declared data and the application won't return until I don't close it (due to a.exec() call) so it has enough time to send everything.
The result, what the server is getting:
POST /host/0x00 HTTP/1.1
Content-Type: application/octet-stream
Content-Length: 3
Connection: Keep-Alive
Accept-Encoding: gzip, deflate
Accept-Language: hu-HU,en,*
User-Agent: Mozilla/5.0
Host: 192.168.1.10:80

Please, consider that there is a newline at the end of the "Host" header, and the content length is filled out correctly.

Regards,
Norbert

[SGaist]

One thing I can see, you don't check whether the request is successful or not. I'd check that first.

On a side note, you don't need to pass by QSring to create your QByteArray: QByteArray payload("1=1"); is better in your case.

[moravas]

Hi,

thanks for the guiding, I found my mistake: it seems, that Qt delivers post requests in multiple packages, which isn't already handled by my device (the server).

Maybe, do you know, how can I force Qt to send the request in one package? Is there a possibility to force it?

Regards,
Norbert

[SGaist]

No I don't, TCP transmissions by definition can be split in several packets. What server are you using that doesn't handle that kind of communication ?

[moravas]

Hi,

it didn't handle until now. Its an embedded device based on FreeRTOS, so every server features had to be developed by myself.

Regards,
Norbert