Add basic clash api

experimental/clashapi/common.go

@@ -0,0 +1,17 @@
+package clashapi
+
+import (
+	"net/http"
+	"net/url"
+
+	"github.com/go-chi/chi/v5"
+)
+
+// When name is composed of a partial escape string, Golang does not unescape it
+func getEscapeParam(r *http.Request, paramName string) string {
+	param := chi.URLParam(r, paramName)
+	if newParam, err := url.PathUnescape(param); err == nil {
+		param = newParam
+	}
+	return param
+}