NbOAuth2AuthStrategy sends parameters in body instead of using 'x-www-form-urlencoded'

[megalucio]

Issue type

I'm submitting a ... (check one with "x")

• bug report
• feature request

Issue description

Current behavior:
When using oauth2 password authentication the username and password information is sent in the body of the request:

{ "grant_type":"password", "email":"testuser", "password":"1234" }

Expected behavior:
According to RFC 6749, this information should be sent using the "application/x-www-form-urlencoded" encoding algorithm.

Steps to reproduce:
Configure NbOAuth2AuthStrategy and attemt to log in againts oauth service.

[nnixaa]

Hey @alain-charles, if you have some time would be great if you could check this one!

[alain-charles]

Hi @nnixaa
OK, i'll have a look at this in the next days.
No problem.

Alain