And demonstrate the use of puffing-billy browser proxy.
Billy can cache and record responses to browser requests. For that to
work we need to allow network connections and disable VCR. But instead I
found that the Billy proxy is just like any other Ruby backend code and
its connections can be recorded with VCR instead.
And instead of stubbing requests via Billy.proxy, we can use standard
Webmock `stub_request`. Now we use puffing-billy just to relay browser
requests via our Ruby app.
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