Loading URL for login is failed in android webview

[printappdev]

Hello.

Actually, our device doesn't have a browser. so I used android webview for OAuth login.

Sometimes loading login page was failed. The blank page was displayed. 

Do you have any ideas to solve this problem? 

Below is the chromium log.

Device android version : Android 4.4.2 (KitKat)

Log

I/chromium: [INFO:CONSOLE(0)] "Refused to load the script '' because it violates the following Content Security Policy directive: "script-src 'unsafe-eval' https://www.dropbox.com/static/compiled/js/ https://www.dropbox.com/static/api/ https://www.dropbox.com/page_success/ https://cfl.dropboxstatic.com/static/compiled/js/ https://www.dropboxstatic.com/static/compiled/js/ https://cfl.dropboxstatic.com/static/js/ https://www.dropboxstatic.com/static/js/ https://cfl.dropboxstatic.com/static/previews/ https://www.dropboxstatic.com/static/previews/ https://cfl.dropboxstatic.com/static/api/ https://www.dropboxstatic.com/static/api/ https://cfl.dropboxstatic.com/static/cms/ https://www.dropboxstatic.com/static/cms/ https://www.google.com/recaptcha/ https://www.gstatic.com/recaptcha/ 'unsafe-inline' ".

Thanks

[Greg-DB]

The Dropbox OAuth app authorization page should only be processed in the user's system browser. Using a web view is not officially supported, so I'm afraid I can't offer help with this. 

That said, Android 4.4.2 itself is relatively old and I believe is itself no longer officially supported by Google, so you may want to look into upgrading to a newer version. Or, at least upgrading the version of Chromium used in your webview, if possible, as that may help with the issue.