回答

增加p3p header很简单

add_header P3P 'policyref="/w3c/p3p.xml", CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT", CP="CAO PSA OUR"'

如果是js等请求遇到跨域问题，增加下面一段配置

location / {
   if ($http_origin ~* (.*\.baidu.com)) {
        add_header 'Access-Control-Allow-Origin' "$http_origin";
        add_header 'Access-Control-Allow-Credentials' "true";
        if ($request_method = "OPTIONS") {
            add_header 'Access-Control-Max-Age' 86400;
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, DELETE';
            add_header 'Access-Control-Allow-Headers' 'reqid, nid, host, x-real-ip, x-forwarded-ip, event-type, event-id, accept, content-type';
            add_header 'Content-Length' 0;
            add_header 'Content-Type' 'text/plain, charset=utf-8';
            return 204;
        }
    }
    # 正常nginx配置
    ......
}