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Dropbox invalid redirect_uri, must be an absolute uri
My app (Xamarin Forms) used to work with the Dropbox API authorisation but now it is showing me an error "invalid redirect_uri, must be an absolute uri". This started happening, probably after I upgr...
@xtremebytes
This is the Xamarin Issue which causes the problem. Apparently work in progress:
[iOS] WebView.Source URL's are HTML encoded
Hope that helps.
Digging in a bit deeper and looking at this code fragment:
this._oauth2State = Guid.NewGuid ().ToString ("N");
var authorizeUri = DropboxOAuth2Helper.GetAuthorizeUri (OAuthResponseType.Token, DropboxAppKey, RedirectUri, this._oauth2State, false, false, null, true); //force re-authenticate
var webView = new WebView { Source = new UrlWebViewSource { Url = authorizeUri.AbsoluteUri } };
webView.Navigating += async (sender, e) => {
if (!e.Url.StartsWith (RedirectUri, StringComparison.OrdinalIgnoreCase)) {
// we need to ignore all navigation that isn't to the redirect uri.
return;
the e.Url used to match the RedirectUri, and now it doesn't. Instead, the e.Url now contains the RedirectUri as a query string parameter as follows:
Is there something more that I am missing?
Another note: the code is based on https://gist.github.com/tomcrusader/b0856a383bcdcf905c7a774c8c1b0879 -- and it used to work fine.
Seems like there were some issues with the new Xamarin Forms upgrade, .net and PCL stuff, so I rolled back all packages upgrades including Dropbox and now things are working.
- Greg-DB
Dropbox Staff
Thanks for the post. I'm glad to hear you were able to get this working again.
I'm not sure I follow this totally though, so just to be clear, are you saying there is a bug in the official Dropbox .NET SDK v4.8.0, or does the bug only appear to be in the "Xamarin Forms upgrade, .net and PCL stuff" ?
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