Switch to a more performant HTTP router

Switch to an implementation based on Trie https://github.com/julienschmidt/httprouter
Invent our minimal middleware interface

type Middleware interface {
    Handler(http.Handler) http.Handler
}

type MiddlewareFunc func(http.Handler) http.Handler

func (m MiddlewareFunc) Handler(h http.Handler) http.Handler {
    return m(h)
}

func Chain(ms ...Middleware) Middleware {
    return MiddlewareFunc(func(handler http.Handler) http.Handler {
        for i = len(ms) - 1; i >= 0; i-- {
            handler = ms[i].Handler(handler)
        }
        return handler
    })
}

authgear / authgear-server

Switch to a more performant HTTP router #26