snallapa opened a new pull request, #25151:
URL: https://github.com/apache/beam/pull/25151

   The purpose of this PR is to support configurable gRPC channels for 
ArtifactService. We have use cases where we run the ExpansionService in 
different environments. One example environment is in Google Cloud Run. This 
requires authenticated gRPC calls with the google cloud token in the gRPC 
header and transport security enabled vs plaint text. With the current public 
methods, we can do this for the expand stub with no problem, but not for the 
artifact stub which would need the same channel configuration.  We ended up 
monkey patching this to get our use case to work. I am contributing the monkey 
patch back to beam. 
   
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