authorize response "Cookie is disabled in your browser"

hi ,

i'm trying to use your api v2 to insert contact in zoho crm using your api requests

now at my first step to authorize my app with zoho client , so i had sent HTTP request to the following :

https://accounts.zoho.com/oauth/v2/auth?scope=ZohoCRM.modules.contacts.ALL&client_id=xxxxxxx&response_type=code&access_type=offline&redirect_uri=http://www.xyz.com/oauth2callback ");

i'm getting an html in response mentions : Cookie is disabled in your browser. Please enable the cookie to continue.

although cookies in my browser is enabled !!!

as i read in your documentation , the response should redirect to redirect_url with grant_token , so i can't force users of my website to disable cookies in their browsers !! and i need to authorize my client to proceed and insert into contacts

any help ??