JDK版本：17.0.5
Open-Resty版本（Nginx改版）：1.25.3.1

nginx配置：

location /prod-api {
    # 允许最大10MB的文件上传
    client_max_body_size 10M;
    
    proxy_pass http://{反射到内部的IP/域名}:{反射到内部的接口};
    rewrite /prod-api/(.*) /$1 break;
    
    proxy_redirect off;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; # 主要是这个参数
    proxy_set_header X-Forwarded-Proto $scheme;
}

java代码：

// import jakarta.servlet.http.HttpServletRequest;
// import org.springframework.web.bind.annotation.GetMapping;
// import org.springframework.web.bind.annotation.RestController;

@GetMapping("/getIp")
public String getIp(HttpServletRequest request) {
    String remoteAddr = "";
    if (request != null) {
        remoteAddr = request.getHeader("X-FORWARDED-FOR");
        if (remoteAddr == null || remoteAddr.isEmpty()) {
            remoteAddr = request.getRemoteAddr();
        }
    }
    return remoteAddr;
}