@@ -0,0 +1,55 @@
+package analytics
+
+import (
+	"context"
+	"net/http"
+)
+
+type contextKey struct{}
+
+var countKeyContextKey contextKey
+
+func WithCountKey(r *http.Request, key string) *http.Request {
+	return r.WithContext(context.WithValue(r.Context(), countKeyContextKey, key))
+}
+
+func GetCountKey(r *http.Request) (string, bool) {
+	key, ok := r.Context().Value(countKeyContextKey).(string)
+
+	return key, ok
+}
+
+func CounterMiddleware(counter Counter) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			rw := newStatusCapturingResponseWriter(w)
+
+			next.ServeHTTP(rw, r)
+
+			countKey, ok := GetCountKey(r)
+			if !ok {
+				if rw.status >= 201 {
+					countKey = http.StatusText(rw.status)
+				} else {
+					countKey = r.URL.Path
+				}
+			}
+
+			counter.Count(r, countKey)
+		})
+	}
+}
+
+type statusCapturingResponseWriter struct {
+	http.ResponseWriter
+	status int
+}
+
+func newStatusCapturingResponseWriter(w http.ResponseWriter) *statusCapturingResponseWriter {
+	return &statusCapturingResponseWriter{w, http.StatusOK}
+}
+
+func (w *statusCapturingResponseWriter) WriteHeader(code int) {
+	w.status = code
+	w.ResponseWriter.WriteHeader(code)
+}