Hello Suneel,
First, in generic policy, the route via http needs to be configured as "Never fail as long as target returns an answer" (on "Other" tab of its properties window).
Second, in generic policy, is the "Request Resource" of the route via http = <Default Request> ?, or a context variable message?
If it's a context variable message, you need to add Authorization header = ${request.http.header.Authorization} to that context variable message. (using "Manage Transport Properties/Headers" assertion)
Regards,
Mark