gianm commented on issue #8686: Router management Proxy routing should have a 
way to route to any node in the cluster
URL: 
https://github.com/apache/incubator-druid/issues/8686#issuecomment-542964407
 
 
   > Also there is already an open proxy in the sampler (http firehose).
   
   I think it's different, because the http firehose at least can't be used 
unless you are an authenticated user and have write access to some datasource. 
(Not ideal but there is at least something that protects it.) The proxy route 
IIRC would be open to anyone anywhere. I believe it relies on the target server 
to do authentication.
   
   Limiting it to just Druid servers could lower the scariness levels enough.
   
   > From a scalability perspective I do not think it is a problem if this is a 
user initiated action (with a warning in the UI). Also remember that it would 
be OK for this to be slow, taking a 100ms pause between every request.
   
   I think with the pause, the scalability issue is less scary, so that sounds 
good. Or, we could also limit it to a certain number of servers. Probably if 
someone has, like, 100 servers, then they have figured out how to set their 
properties properly by then.

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