I get a blank page when I try to do a API Request.
The blank page appears also on dropbox.com website.
The issue affected AOSP browser on Android 6.0, others browsers work good, AOSP Browser on Android 4.4.4 works good.
I need a workaround beacuse the app run on a custom device without PlayStore with only the default browser
I'm not sure I understand your message. Can you clarify what you mean when you say you get a blank page from an API request? Dropbox API requests involve communicating with the Dropbox API servers, typically exchanging JSON, not HTML web pages, over HTTPS.
Are you referring to the Dropbox app authorization page itself (at https://www.dropbox.com/oauth2/authorize...)? That's not an API request, but rather just part of the Dropbox web site, used during the OAuth app authorization process.
If that's what you're referring to, please note that that web page is subject to the overall dropbox.com system requirements. That doesn't officially support the "AOSP browser", so I recommend upgrading to a newer, supported browser.
The problem is that with the default browser pre-installed in Android 6.0 stock the dropbox.com website (and so also the authorization app page) show a blank page, so i can't authorize my app.
With the default browser on Android 4.4 stock all works good.
One month ago also with browser pre-installed in Android 6.0 stock all was ok...
I just tried this myself with an Android 6.0 emulator, and I'm not seeing the behavior you're seeing:
Mozilla/5.0 (Linux; Android 6.0.1; Max2 Build/2018-12-26_19-06_2.0.1_0d1b2fc; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/44.0.2403.119 Safari/537.36
Mozilla/5.0 (Linux; Android 6.0; Android SDK built for x86 Build/MASTER; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/44.0.2403.119 Safari/537.36
Thanks! That's helpful. I'm bringing this up with the team. Again though, I unfortunately can't promise a fix as this browser isn't officially supported.
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