MakeLabelValue converts a Gorilla mux path to a string suitable for use in a Prometheus label value.

Merge produces a middleware that applies multiple middlesware in turn; ie Merge(f,g,h).Wrap(handler) == f.Wrap(g.Wrap(h.Wrap(handler))).

PathReplace replcase Request.RequestURI with the specified string.

PathRewrite supports regex matching and replace on Request URIs.

Identity is an Interface which doesn't do anything.

Logging middleware logs each HTTP request method, path, response code and duration.

Instrument is a Middleware which records timings for every HTTP request.

Interface is the shared contract for all middlesware, and allows middlesware to wrap handlers.

Func is to Interface as http.HandlerFunc is to http.Handler.