[stunnel-users] Disguising HTTP 503 services unavailable

It is my understanding that; stunnel clients give up connecting servers because of HTTP 503 services unavailable, tunneling failure causes stunnel clients to notify original senders of errors, and original senders acknowledge communication failure and stop program.

I would like stunnel clients to reconnecting servers in cases of 503 and not to notify original senders of failure, in order that original senders are unaware of failure and can continue program.

If possible, I want to do this by writing stunnel.conf without modifying souce codes.

Is this configuration possible?