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This change refactors the fetcher to simplify the implementation and return more information about downstream errors.
TopLevelRequest
, instead turning the Fetcher into an implementation that only makes one request given aResourceName
and arguments. Initially, the plan was to allow the fetcher to make multiple requests at once, but that is not a priority anymore due to the engine refactor.We can now get nice error responses like this:
![screen shot 2017-08-09 at 2 44 58 pm](https://user-images.githubusercontent.com/4421444/29146378-b315ce24-7d15-11e7-9e32-3662d6ba1d73.png)