adutra commented on PR #12406:
URL: https://github.com/apache/iceberg/pull/12406#issuecomment-2688884965

   Hi @akhilputhiry while I understand the problem I think there are a few 
concerns with this PR:
   
   First off, there is already some proxy support in `HTTPClient`:
   
   1. `org.apache.iceberg.rest.HTTPClient.Builder#withProxy`
   2. `org.apache.iceberg.rest.HTTPClient.Builder#withProxyCredentialsProvider`
   
   Can you confirm that adding `ProxySupport` on top of the existing code will 
work, e.g. if `withProxy` is used? Or are these two things mutually exclusive? 
I also think that you should pass the `ProxySelector` via the builder, just 
like the methods above.
   
   Secondly, the introduction of proxy support in `HTTPClient` has me wondering 
for a while how this is supposed to work in the case where the IDP is external. 
Right now, my understanding is that if a proxy is defined, it will be used for 
_all_ requests, both to the catalog server and the IDP. 
   
   This may not be desirable in all cases. I would like to make it possible to 
select different proxy configurations depending on the request URL. Do you 
think that would be possible with `ProxySupport`?


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