# Pastebin W8b8BZcW
    this.page.registerRoute(/(.*)/, (ctx, next) => {
      if (window.URLSearchParams) {
        const pathname = toPathname(ctx.canonicalPath);
        const searchParams = toSearchParams(ctx.canonicalPath);
        if (searchParams.has('usp')) {
          const usp = searchParams.get('usp');
          this.reporting.reportLifeCycle(LifeCycle.USER_REFERRED_FROM, {usp});
          searchParams.delete('usp');
          this.redirect(toPath(pathname, searchParams));
          return;
        }
      }
      next();
    });