请问哪里可以看到最全的 HTTP Header 的说明呀？

我用 ChatGPT 问了一个获取客户端 IP 的代码，不太敢用，我得查一下：

public String getClientIP(HttpServletRequest request) {
    String ip = request.getHeader("X-Real-IP");
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        //经过如负载均衡后的请求 header 会添加此请求头来标识源客户端的 IP 地址，如果不这样弄的话，那拿到负载均衡机器的 IP 地址并没有什么用的。
        ip = request.getHeader("X-Forwarded-For");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_CLIENT_IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_X_FORWARDED_FOR");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
    }
    return ip;
}

这是我发现的网站： https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers ，但像代码中的大部分 Header 查不到，我就只查到一个 X-Forwarded-For