Hi Praveen,
Thanks for being patient. We are a small team and are working hard to answer every question. The error you are experiencing is usually caused by the app name being incorrect. I know you have stated above that you were able to pull from the /rest/api_docs using:
–My Url Here–/rest/api_docs?app_name=sql
If you had an administrator session before doing this in your browser it wouldn’t have mattered what app_name was appended in the url…it would have worked.
Part of your question is a bit confusing to me so let’s sort this out first. You mentioned that you have a service named ‘sql’ that is assigned to your role Amazon RDS. You are also appending ‘sql’ as the app_name parameter in your call to rest/api_docs. Do you have an app named ‘sql’ and a service named ‘sql’?