How to access the REST service url in the REST Client

Question

I have developed web-service application using app-fuse frame work But I couldn't reach the service url admin authentication username :admin and password :admin and here no any Oauth configuration

my service url is : http:// :8080/ims-web/services/api/gencodes/getGencodeByDistType

Under the Response header I got the message like that Status Code: 500 Internal Server Error