$http.get request does not work with API level 31-CodePudding

I ask for your help for a problem that I encounter with IONIC 1. When I change the API level from 30 to 31 in the config.xml file:

this code is not working

$http.get($scope.url)
.then(function (success) {
  ...
}, function (error) {
$scope.errTXT = JSON.stringify(error);
});

returns a status of 0.

{ "data": null, "status": 0, "config": { "method": "GET", "transformRequest": [ null ], "transformResponse": [ null ], "url": "https://xxxxxxxxxxxxxxxxxx", headers: { "Accept": "application/json, text/plain, /" } }, "statusText": "" }

I don't understand why the result of http is null

CodePudding user response：

Did you remove the "android" folder and add it again?

ionic cordova platform remove android
ionic cordova platform add android

CodePudding user response：

Status code 0 usually means a CORS error.

You can read about Ionic CORS errors here.

Essentially, it is likely a misconfiguration on your server headers which are causing your Android app to throw the status code 0.

If you are using a development environment (e.g. localhost:4200) then you can add the following to your config.xml which should allow you to run it without needing a HTTPS:

<preference name="hostname" value="localhost" />
<preference name="AndroidInsecureFileModeEnabled" value="true" />