Login errors

I am trying to test my new java application, i am reading api_key and api_secret from properties file (temporarily for testing) and request_token i am manually generating from the url https://kite.trade/connect/login?v=3&api_key={my api_key}, and request_token i am passing using http post method to server to generate session, but always i am getting the below error

403 Forbidden https://api.kite.trade/session/token
okhttp3.OkHttpClient : {"status":"error","message":"Token is invalid or has expired.","data":null,"error_type":"TokenException"}
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