What does “WARN Could not determine content-length of response body.” mean and how to I get rid of it?

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Asked the same question to one of Rails-Core’s members:

https://twitter.com/luislavena/status/108998968859566080

And the answer:

https://twitter.com/tenderlove/status/108999110136303617

ya, it’s fine. Need to clean it up, but nothing is being hurt.

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