Web协议详解与抓包实战：HTTP1协议-内容协商是怎样进行的（8）

一、内容协商的两种方式

每个 URI 指向的资源可以是任何事物，可以有多种不同的表述，例如一份文档可以有不同语言的翻译、不同的媒体格式、可以针对不同的浏览器提
供不同的压缩编码等

二、Proactive 主动式内容协商

三、Reactive 响应式内容协商

四、常见的协商要素

1、常见协商要素1

2、常见协商要素2

内容编码：主要指压缩算法

响应中的压缩方式

五、国际化与本地化

六、资源表述的元数据头部

六、cURL工具使用

1、--compressed 将结果解压缩

命令

curl 'https://www.baidu.com/' -H 'Connection: keep-alive' -H 'Pragma: no-cache' -H 'Cache-Control: no-cache' -H 'Upgrade-Insecure-Requests: 1' -H 'User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3' -H 'Accept-Encoding: gzip, deflate, br' -H 'Accept-Language: zh-CN,zh;q=0.9' -H 'Cookie: BDUSS=Y3Ty0zbFdRbTBIWWdlZ0UtRjZpOGNzdFFtVXVzNTJiemxXNzdyc1lNak45ZkJjSVFBQUFBJCQAAAAAAAAAAAEAAACumLcCbHVvYWhvbmcAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAM1oyVzNaMlcRH; A^`=1570252928jMyG000154233; BAIDUID=D3466420B11AEE8C6DCE1776E360E57C:FG=1; PSTM=1570252049; BIDUPSID=9ED37D1EFAB864BCB9197CD7637AB8CC; BD_UPN=12314353; BDORZ=FFFB88E999055A3F8A630C64834BD6D0; H_PS_645EC=a521LDhJX1l%2BFB6jUNwQI7xetFq3k3%2FLeU6yK%2Fb70nZrV8c%2B%2FpIMx8OkrgfHWtqdpDC8; BD_HOME=1; H_PS_PSSID=1430_21124_29522_29720_29568_29220; sugstore=1' --compressed

运行结果

    bds.comm.dpquery="";
    bds.comm.samSugApi=s_session.sid === "25219" ? 1 : 0;
    var index_content = $('#head');
    var index_foot= $('#ftCon');
    var index_css= $('#style_super_inline');
    var index_is_css = $('#s_is_index_css');
    var index_css_content = index_css.html();
    var index_u= $('#u_sp');
    var result_u= $('#u');
    window.index_links = [];
    var result_head = $("#head");
    window.index_on=function(){
        s_session.index_off = false;
    };
    window.index_off=function(){
        s_session.index_off = true;
        $(document.body).attr('link', '#0000cc');
        index_links = [];
        $("head").find("link").each(function(){
            index_links.push(this);
            $(this).remove();
        });
        index_css.remove();
        index_is_css.remove();
        $('#head_wrapper').css('width','');
        $('#kw').css('font-family','');
        $('head').append($.decodeHTML($('#s_index_off_css').html()));
        $('head').append($.decodeHTML($('#s_is_result_css').html()));
        $('.s-tips-skin').remove();
        $('.s-skin-container').remove();
        $('#s_mancard_newmusic').remove();
    };

2、去掉--compressed 结果是二进制文件

curl 'https://www.baidu.com/' -H 'Connection: keep-alive' -H 'Pragma: no-cache' -H 'Cache-Control: no-cache' -H 'Upgrade-Insecure-Requests: 1' -H 'User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3' -H 'Accept-Encoding: gzip, deflate, br' -H 'Accept-Language: zh-CN,zh;q=0.9' -H 'Cookie: BDUSS=Y3Ty0zbFdRbTBIWWdlZ0UtRjZpOGNzdFFtVXVzNTJiemxXNzdyc1lNak45ZkJjSVFBQUFBJCQAAAAAAAAAAAEAAACumLcCbHVvYWhvbmcAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAM1oyVzNaMlcRH; A^`=1570252928jMyG000154233; BAIDUID=D3466420B11AEE8C6DCE1776E360E57C:FG=1; PSTM=1570252049; BIDUPSID=9ED37D1EFAB864BCB9197CD7637AB8CC; BD_UPN=12314353; BDORZ=FFFB88E999055A3F8A630C64834BD6D0; H_PS_645EC=a521LDhJX1l%2BFB6jUNwQI7xetFq3k3%2FLeU6yK%2Fb70nZrV8c%2B%2FpIMx8OkrgfHWtqdpDC8; BD_HOME=1; H_PS_PSSID=1430_21124_29522_29720_29568_29220; sugstore=1'

截图如下

3、去掉头部的压缩-H 'Accept-Encoding: gzip, deflate, br'