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WEBrick appears to be approaching EOL and is being removed from Rackup, as mentioned here. This is causing issues with a number of services as discussed here. By switching to Puma we can solve this issue while also still supporting both Rack 2 and 3.
I merged this change in a previous PR, but then had to revert it due to issues in pay-svc. This PR adds a fix (the second commit) to pass in
pidfile: nil
to Puma iftmp/pids/
doesn't exist. I'll test this out on Skyhook and Pay-svc for a few days to get confidence it works okay.