增加代理错误处理

lib/Lepao/lepaoSchoolHttp.js

@@ -73,6 +73,7 @@ function isQgProxyEligibleFailure(err) {
     const status = err.response?.status
     if (status === 407) return true
     if (status === 408) return true
+    if (status === 500) return true
     if (status === 502 || status === 503 || status === 504) return true
     if (
         err.code &&