fix(oauth2): generate default oauth2RedirectUrl based on page location and path (#7476)

Co-authored-by: Tim Lai <timothy.lai@gmail.com>

src/core/index.js

@@ -31,7 +31,7 @@ export default function SwaggerUI(opts) {
     maxDisplayedTags: null,
     filter: null,
     validatorUrl: "https://validator.swagger.io/validator",
-    oauth2RedirectUrl: `${window.location.protocol}//${window.location.host}/oauth2-redirect.html`,
+    oauth2RedirectUrl: `${window.location.protocol}//${window.location.host}${window.location.pathname.substring(0, window.location.pathname.lastIndexOf("/"))}/oauth2-redirect.html`,
     persistAuthorization: false,
     configs: {},
     custom: {},