The server side of my Android app has a file that specifies root URLs for 
various resources that I use throughout the lifecycle of my app. Two of the 
resources also specify URLs I'll need to fetch other resources.

Since the HTTP framework we wrote is asynchronous, I need a way to chain 
these calls together in such a way that the first call must finish and be 
successful before making the 2nd. Can the list suggest a good way to do this 
while giving me a way to handle the error cases?

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