Unable to access few REST API's (Secure Mode)

When we try to access the below REST API"s through curl commands in secure cluster we are getting error "HTTP ERROR 500"

/namespaces/namespace (PUT)
/namespaces/namespace (POST)
/table/scanner/(PUT)

When we try to perform the below Delete API's , in secure cluster it gives 200OK status but at backend tables/namespace is not getting deleted

/namespaces/namespace (DELETE)
/table/schema (DELETE)

When try to perform the below API's in secure cluster we are getting "204 Error"

/table/scanner/scanner-id (get)
/table/scanner/scanner-id (delete)

When trying to use this REST API " specific o timestamp" in secure cluster

/table/row/column:qualifier/timestamp (GET) getting "404 error " but the same API with " version" is it working