As I said before, you can't have your users present their Dropbox username and password to your application - that is not allowed.
You have to use the authentication flow detailed here:
This flow connects to the Dropbox servers using a browser instance, allows the user to authenticate directly with the Dropbox servers, and gives you an authentication token at the end of it. It is that authentication token that you then use to access Dropbox on behalf of that user.
ohh this is 3legged flow...
Dropbox dnt support "4.3 Resource Owner Password Credentials Grant" ??
Oauth2 specs: https://tools.ietf.org/html/rfc6749#section-1.3.3
POST /token HTTP/1.1
Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW
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