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I need to replace an existing API interface with one that considers an incoming Auth token and also issues a machine-to-machine token for the outgoing service calls.

In summary, this is an API using gorilla/mux routing framework and I'm just adding endpoints to a mux.NewRouter(). Nothing fancy...yet ;).

I have been trying a few different patterns, but the one that seems most appealing is the Adapter Interface derived by Mat Ryer in https://medium.com/@matryer/writing-middleware-in-golang-and-how-go-makes-it-so-much-fun-4375c1246e81 and https://go-talks.appspot.com/github.com/matryer/golanguk/building-apis.slide#30

In summary with no direct logic, I have done the following and get stuck in an infinite loop when I run the endpoint from Postman.

{"level":"info","msg":"New Relic Checkpoint!!! /endpoint","time":"2019-08-19T14:28:27-05:00"} {"level":"info","msg":"Security Checkpoint!!! /endpoint","time":"2019-08-19T14:28:27-05:00"} {"level":"info","msg":"Header Checkpoint!!! /endpoint","time":"2019-08-19T14:28:27-05:00"} {"level":"info","msg":"New Relic Checkpoint!!! /endpoint","time":"2019-08-19T14:28:27-05:00"} {"level":"info","msg":"Security Checkpoint!!! /endpoint","time":"2019-08-19T14:28:27-05:00"} {"level":"info","msg":"Header Checkpoint!!! /endpoint","time":"2019-08-19T14:28:27-05:00"}