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a155f0bda6
The ReverseProxy code from the standard library doesn't actually give us the control that we want. Pull it down and rip out what we don't need, adding tests in the process. All available endpoints are attempted when proxying a request. If a proxied request fails, the upstream will be considered unavailable for 5s and no more requests will be proxied to it. After the 5s is up, the endpoint will be put back to rotation.