Apace proxy caching "service temporarily unavailable" response when target is down

Apace proxy caching "service temporarily unavailable" response when target
is down

I have apache sitting in front of my node server. Node is running on
certain port, I am using apache to proxy to that port and also have apache
configured for https.
When I start apache and then start my node server everything runs great.
If I bring down the node server and try to hit my service apache says
'Service Temporarily Unavailable'. This is expected as my node server is
down.
However when I bring my server back up without touching apache and try to
hit me service again apache still says 'Service Temporarily Unavailable'.
Its like apache is not trying again. If I bounce apache all is well again.
Since I am running with forever there is a chance my server could be down
for a few second if a fatal happens. I don't want to have to bounce apache
if that happens.
Is there anyway to get apache to always try and not cache the fact that a
Service it recently tried to hit was unavailable?