Go 中无痛的中间件链接
Alice provides a convenient way to chain your HTTP middleware functions and the app handler.
In short, it transforms
Middleware1(Middleware2(Middleware3(App)))
to
alice.New(Middleware1, Middleware2, Middleware3).Then(App)
None of the other middleware chaining solutions behaves exactly like Alice. Alice is as minimal as it gets: in essence, it's just a for loop that does the wrapping for you.
Check out this blog post for explanation how Alice is different from other chaining solutions.
Your middleware constructors should have the form of
func (http.Handler) http.Handler
Some middleware provide this out of the box. For ones that don't, it's trivial to write one yourself.
func myStripPrefix(h http.Handler) http.Handler {
return http.StripPrefix("/old", h)
}
This complete example shows the full power of Alice.
…
Here, the request will pass throttled first, then an http.TimeoutHandler we've set up, then nosurf and will finally reach our handler.
Note that Alice makes no guarantees for how one or another piece of middleware will behave. Once it passes the execution to the outer layer of middleware, it has no saying in whether middleware will execute the inner handlers. This is intentional behavior.
Alice works with Go 1.0 and higher.
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