Expose metadata when running on bunny.net magic containers.

src/pages.go

@@ -27,6 +27,15 @@ func getPage(w http.ResponseWriter, r *http.Request) error {
 
 	host := GetHost(r)
 
+	if _, onBunnyNet := os.LookupEnv("BUNNYNET_MC_APPID"); onBunnyNet {
+		w.Header().Set("X-Bunnynet-MC", fmt.Sprintf(
+			"%s, %s, %s",
+			os.Getenv("BUNNYNET_MC_REGION"),
+			os.Getenv("BUNNYNET_MC_ZONE"),
+			os.Getenv("BUNNYNET_MC_PODID"),
+		))
+	}
+
 	// allow JavaScript code to access responses (including errors) even across origins
 	w.Header().Set("Access-Control-Allow-Origin", "*")
 	w.Header().Set("Access-Control-Max-Age", "86400")