remove number for source

src/canonical-hosts/canonical-hosts.go

@@ -0,0 +1,39 @@
+// ## Canonical Hosts
+
+package main
+
+import "net/http"
+import "strings"
+import "fmt"
+
+type handler http.HandlerFunc
+
+func hello(w http.ResponseWriter, r *http.Request) {
+    w.Header().Set("Content-Type", "text/plain")
+    fmt.Fprintln(w, "Hello canonical world")
+}
+
+func wrapCanonicalHost(f handler, chost string) handler {
+    return func(w http.ResponseWriter, r *http.Request) {
+        hostPort := strings.Split(r.Host, ":")
+        host := hostPort[0]
+        if host != chost {
+            fmt.Println("redirect to", chost)
+            hostPort[0] = chost
+            url := "http://" +
+                strings.Join(hostPort, ":") +
+                r.URL.String()
+            http.Redirect(w, r, url, 301)
+            return
+        }
+        f(w, r)
+    }
+}
+
+func main() {
+    handler := wrapCanonicalHost(hello, "localhost")
+    http.HandleFunc("/", handler)
+    http.ListenAndServe(":5000", nil)
+}
+
+// todo: comment about https canonicalization

src/canonical-hosts/canonical-hosts.sh

@@ -0,0 +1,4 @@
+$ go run canonical-hosts.go
+
+$ curl -i -L http://127.0.0.1:5000/go
+$ curl -i -L http://127.0.0.1:5000/go