Not sure about what is the purpose of dispatch evalUrl function

[chun-wen]

hi I have two questions below

1. May I know what is the purpose of this function ?
2. why we need to dispatch evalUrl method every 500 milliseconds ?

Below is source code
Path: packages\chatbot-rasa-webchat\src\components\Widget\index.js

this.intervalId = setInterval(() => dispatch(evalUrl(window.location.href)), 500);

Path: packages\chatbot-rasa-webchat\src\store\store.js

      case actionTypes.EVAL_URL: {
        const pageCallbacks = store.getState().behavior.get('pageChangeCallbacks');
        const pageCallbacksJs = pageCallbacks ? pageCallbacks.toJS() : {};

        const newUrl = action.url;

        if (!pageCallbacksJs.pageChanges) break;

        if (store.getState().behavior.get('oldUrl') !== newUrl) {
          const { pageChanges, errorIntent } = pageCallbacksJs;
          const matched = pageChanges.some((callback) => {
            if (callback.regex) {
              if (newUrl.match(callback.url)) {
                emitMessage(callback.callbackIntent);
                return true;
              }
            } else {
              let cleanCurrentUrl = cleanURL(newUrl);
              let cleanCallBackUrl = cleanURL(callback.url);
              if (!cleanCallBackUrl.match(/\?.+$/)) {
                // the callback does not have a querystring
                cleanCurrentUrl = trimQueryString(cleanCurrentUrl);
                cleanCallBackUrl = trimQueryString(cleanCallBackUrl);
              }
              if (cleanCurrentUrl === cleanCallBackUrl) {
                emitMessage(callback.callbackIntent);
                return true;
              }
              return false;
            }
          });
          if (!matched) emitMessage(errorIntent);
        }
        break;
      }

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