[BUG] [Go service]The request on Swagger-UI always display as loading when requesting citylist with regionlist api.

[lyiyu66]

Describe the bug commit: 2ee15aa8da722e980cad0664283f4c719db5a289 The request on Swagger-UI always display as loading when requesting citylist with regionlist api.

To Reproduce Steps to reproduce the behavior:

1. Go to Swagger-UI: https://:9090/i18n/api/v2/swagger/index.html#/locale-api/get_locale_regionList
2. Input "en" as language and set "true" as displayCity, then click "Execute"
3. See the response: loading

Expected behavior Get the response returned timely.

Comment Can get 200 response on console timely.

[Xiaochao8]

There is a similar issue gin-swagger