XMLHttpRequest : doesn't work anymore after a reconnection

Geoffroy

Hi everybody,

Like mentionned in the title, I can't reach anymore my internet connection after a deconnection / reconnection

I think that is a big regression since Qt 5.5.1 because I don't have this problem with Qt 5.5.0

Here is a minimal code to reproduce the issue :

Window {

visible: true

Button {

    text: "Test"

    onClicked: {

        req = new XMLHttpRequest()
        req.onreadystatechange = function (event) {
            if (req.readyState === XMLHttpRequest.DONE) {
                console.log("Make request : status = " + req.status)
                console.log(req.responseText.toString())
            }
        }

        req.open("GET", "http://www.google.fr", true)
        req.send()
    }
}

}

Steps to reproduce :

Execute the code above
Click on the test button : you should see data from google
Turn off your wifi adapter
Click on test: nothing appears : status is equal to 0
Turn on your wifi adapter
Click on test several times: you can't reach data anymore. Status is always equals to 0

SGaist

Hi and welcome to devnet,

You should add which OS you're running on

Geoffroy

Hi, Thanks.

I've found this problem on Mac OSX, Ios & Android (with Qt 5.5.1 release version for MacOSX)

SGaist

Then I'd recommend checking the bug report system to see if it's something known. If not please consider opening a new report providing a minimal compilable example (with the qml you have here) to reproduce the behavior.

mcosta

Hi,

I suggest to print the readyState in the change state handler

        req.onreadystatechange = function (event) {
            console.log("readyState: " + req.readyState);
            if (req.readyState === XMLHttpRequest.DONE) {
                console.log("Make request : status = " + req.status)
                console.log(req.responseText.toString())
            }
        }

in that case you can see what happens in your connection

Geoffroy

Hi,

I will detail a little bit more what happens.

Reminder about ready state code :
0: request not initialized
1: server connection established
2: request received
3: processing request
4: request finished and response is ready

Here is my log :

[Wifi is enabled, I make a first request]

qml: readyState: 1
qml: readyState: 2
qml: readyState: 3
qml: readyState: 3
qml: readyState: 3
qml: readyState: 4
qml: request status 200 => everything is OK

[I switch off my wifi adapter, and make a request again]

qml: readyState: 1 => status 1 = server connection established ( strange isnt' it ? )

[after 10s, I switch on my wifi adapter]

qml: readyState: 2
qml: readyState: 3
qml: readyState: 3
qml: readyState: 3
qml: readyState: 4
qml: request status 200 => ok, my last request was completed normally

[make other requests, several time ]

qml: readyState: 1
qml: readyState: 4
qml: request status 0

...

qml: readyState: 1
qml: readyState: 4
qml: request status 0

I hope this will help you ..
I'm currently develop a mobile application where this kind of scenario can often appear ..