Improve the doc of the middleware example
diff --git a/README.md b/README.md
index 4ea1ce5..a98c293 100644
--- a/README.md
+++ b/README.md
@@ -129,24 +129,34 @@
Here is a quick example: Does your server serve multiple domains / hosts? You want to use subdomains?
Define a router per host!
```go
+// We need an object that implements the http.Handler interface.
+// Therefore we need a type for which we implement the ServeHTTP method.
+// We just use a map here, in which we map host names to http.Handlers
type HostSwitch map[string]http.Handler
+// Implement the ServerHTTP method on our new type
func (hs HostSwitch) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+ // Check if a http.Handler is registered for the given host.
+ // If yes, use it to handle the request.
if handler := hs[r.URL.Host]; handler != nil {
handler.ServeHTTP(w, r)
}
+ // Handle host names for wich no handler is registered
http.Error(w, "Forbidden", 403) // Or Redirect?
}
func main() {
+ // Initialze a router as usual
router := httprouter.New()
router.GET("/", Index)
router.GET("/hello/:name", Hello)
+ // Make a new HostSwitch and insert the router for example.com
hs := make(HostSwitch)
- hs["example.com"] = router
+ hs["example.com"] = router
+ // Use the HostSwitch to listen and serve on port 12345
log.Fatal(http.ListenAndServe(":12345", hs))
}
```
