String url = request.getScheme() + "://" +                request.getServerName() +                ("http".equals(request.getScheme()) && request.getServerPort() == 80 || "https".equals(request.getScheme()) && request.getServerPort() == 443 ? "" : ":" + request.getServerPort()) +                request.getRequestURI() +                (request.getQueryString() != null ? "?" + request.getQueryString() : "");

tips：

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