How to revoke a token in  salesforce.?



i have tried this,

PostMethod post = new PostMethod("https://test.salesforce.com/services/oauth2/revoke);     
post.addParameter("grant_type","refresh_token");
post.addParameter("client_id","3MVG9e2mBbxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx3Tv.ZkkjA_jXe36YpUEhUi3ddV");
post.addParameter("client_secret","43608xxxxxxxxx9351");
post.addParameter("refresh_token","00DN0000000OJpAxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxAOS92jBbid3ytwYpLkz");
post.addParameter("redirect_uri","https://www.artxxxxxxxxxxxines.com");


but this is giving me an error :  error=unsupported_token_type&error_description=this token type is not supported

i want to open a lead form through apex class using lead id...is it possible ????

i have created an app in salesforce and provided callback url, i received the code successfully but when i am requesting for token using callback url, client id and client secret key, i am getting an error i.e Invalid grant, authorization code invalid.

How to revoke a token in  salesforce.?



i have tried this,

PostMethod post = new PostMethod("https://test.salesforce.com/services/oauth2/revoke);     
post.addParameter("grant_type","refresh_token");
post.addParameter("client_id","3MVG9e2mBbxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx3Tv.ZkkjA_jXe36YpUEhUi3ddV");
post.addParameter("client_secret","43608xxxxxxxxx9351");
post.addParameter("refresh_token","00DN0000000OJpAxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxAOS92jBbid3ytwYpLkz");
post.addParameter("redirect_uri","https://www.artxxxxxxxxxxxines.com");


but this is giving me an error :  error=unsupported_token_type&error_description=this token type is not supported

i have created an app in salesforce and provided callback url, i received the code successfully but when i am requesting for token using callback url, client id and client secret key, i am getting an error i.e Invalid grant, authorization code invalid.

i have created an app in salesforce and provided callback url, i received the code successfully but when i am requesting for token using callback url, client id and client secret key, i am getting an error i.e Invalid grant, authorization code invalid.