Add k8s proxy

pkg/proxy/error.go

@@ -0,0 +1,15 @@
+package proxy
+
+import "net/http"
+
+var (
+	er = &errorResponder{}
+)
+
+type errorResponder struct {
+}
+
+func (e *errorResponder) Error(w http.ResponseWriter, req *http.Request, err error) {
+	w.WriteHeader(http.StatusInternalServerError)
+	w.Write([]byte(err.Error()))
+}