diff --git a/app/requests.ts b/app/requests.ts
index a37feaf06..7646f05db 100644
--- a/app/requests.ts
+++ b/app/requests.ts
@@ -43,7 +43,7 @@ function getHeaders() {
 }
 
 export function validUser(signature: String) {
-  return fetch(`//uc.zhiketong.net/api/check_user_white/?signature=${signature}`)
+  return fetch(`//uc.zhiketong.net/api/check_user_white/?signature=${window.encodeURIComponent(`${signature}`)}`)
     .then((response) => response.json())
     .then((data) => {
       return {