Created Ping API

go.mod

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+module github.com/peterramaldes/billgo
+
+go 1.18

handlers.go

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+package main
+
+import "net/http"
+
+func handlers(mux *http.ServeMux) {
+	mux.Handle("/ping", &pingHandler{})
+}

http.go

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+package main
+
+import "net/http"
+
+func notFound(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusNotFound)
+	w.Write([]byte(`{"error": "not found"}`))
+}

main.go

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+package main
+
+import (
+	"net/http"
+)
+
+func main() {
+	mux := http.NewServeMux()
+	handlers(mux)
+	http.ListenAndServe(":3000", mux)
+}

ping.go

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+package main
+
+import (
+	"net/http"
+	"regexp"
+)
+
+var (
+	pingRe = regexp.MustCompile(`^\/ping*$`)
+)
+
+type pingHandler struct{}
+
+func (h *pingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("content-type", "application/json")
+	switch {
+	case r.Method == http.MethodGet && pingRe.MatchString(r.URL.Path):
+		h.Ping(w, r)
+		return
+	default:
+		notFound(w, r)
+		return
+	}
+}
+
+func (h *pingHandler) Ping(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(`{"status": "alive"}`))
+}