🔖 It works!

main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/julienschmidt/httprouter"
+)
+
+func Status(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
+	header := w.Header()
+	header.Set("Access-Control-Allow-Origin", "*")
+
+	status := ps.ByName("status")
+	fmt.Printf("Got %s status\n", status)
+	if status == "" {
+		status = "200"
+	}
+
+	ret, err := strconv.Atoi(status)
+
+	if err != nil || ret < 100 || ret > 599 {
+		if err != nil {
+			fmt.Printf("Got an error: %s\n", err.Error())
+		} else {
+			fmt.Printf("Requested status %d\n", ret)
+		}
+		ret = 200
+	}
+	fmt.Printf("Returning %d\n", ret)
+
+	w.WriteHeader(ret)
+}
+
+func GetRouter() *httprouter.Router {
+	router := httprouter.New()
+
+	// We don't handle OPTIONS, so that we can support CORS
+	methods := [8]string{
+		http.MethodGet,
+		http.MethodHead,
+		http.MethodPost,
+		http.MethodPut,
+		http.MethodPatch,
+		http.MethodDelete,
+		http.MethodConnect,
+		http.MethodTrace}
+	for _, method := range methods {
+		router.Handle(method, "/:status", Status)
+	}
+
+	// Handle CORS preflight requests
+	router.GlobalOPTIONS = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("Access-Control-Request-Method") != "" {
+			// Set CORS headers
+			header := w.Header()
+			header.Set("Access-Control-Allow-Methods", header.Get("Allow"))
+			header.Set("Access-Control-Allow-Origin", "*")
+		}
+
+		// Adjust status code to 204
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	return router
+}
+
+func GetPort() string {
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = ":80"
+	}
+	if !strings.HasPrefix(port, ":") {
+		port = ":" + port
+	}
+
+	return port
+}
+
+func main() {
+	port := GetPort()
+	fmt.Printf("Listening on %s\n", port)
+	log.Fatal(http.ListenAndServe(port, GetRouter()))
+}