解决锐速云验证码不变化bug

nginx.conf

@@ -184,6 +184,7 @@ http {
 
                             local ok, err = os.remove(filepath)
                             if ok then
+                                cache:delete(key)
                                 ngx.log(ngx.WARN, "File deleted after serving: ", filepath)
                             else
                                 ngx.log(ngx.WARN, "Failed to delete file: ", filepath, ", error: ", err)