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Web-从Java Request对象到HTTP协议

时间:2018-06-22 00:48:00      阅读:251      评论:0      收藏:0      [点我收藏+]

https://mp.weixin.qq.com/s/PjcA22STEDGwRxVQweObQQ

Java Web中的Request对象是哪里来的?Response对象的角色是什么?

Java Web中的Session对象中信息是哪里来的?

 

词汇表

SRC: 源IP,源端口等
DST: 目的IP,目的端口等
Application Container: 应用容器,如Tomcat, Glassfish,解析执行Java Servlet, Structs等程序;
Browser: 浏览器
Client_Port: (1024, 65535), 不固定,创建Socket时,操作系统协议栈自主选择;

 

一. 通信拓扑图

技术分享图片

技术分享图片

 

 

典型交互过程如下:
1. 用户点击URL或按钮。注意,这里是在客户端电脑上,与服务端时物理隔离的,跨越高山和大海。
2. 浏览器将URL或按钮点击事件,按照HTTP协议,封装成HTTP请求信息,包括Headers/Content;
3. HTTP协议将请求内容下发给TCP协议:TCP协议加上TCP头(包括源端口和目的端口),传递给IP层;
4. IP协议加上IP头(包括源IP地址和目的IP地址),把TCP报文转换成IP包,然后交给数据链路层;
5. 数据链路层加上MAC头,交给物理层;
6. 物理层加上物理头,把帧转换成物理信号发送到网线上;
7. 中间设备(交换机、路由器、边界路由器)不停的变更MAC头、物理头,把IP分组转发到下一跳;
8. IP分组跨越高山和大海,来到了服务器;
9. 服务器逐层解封IP头,TCP头,把HTTP请求交给HTTP服务器;
10.HTTP服务器按照HTTP协议,解析HTTP请求头,把请求信息传递给应用容器;
11.应用容器把请求信息封装成Request对象,并创建Response对象。把Request/Response对象传递给URL处理程序(Action);
12.URL处理程序根据Request封装的请求信息,把响应信息写入Response对象之后结束;
13.应用容器把Response对象包含的信息,按照HTTP协议,转换成HTTP Response信息,包括响应头和响应内容;
14.HTTP服务器把HTTP Response信息,发送给浏览器;
15.层层封装...
16.跨越高山和大海;
17.浏览器接收到HTTP Response信息,把响应内容显示出来;

 

二. 最终化身:HTTP

浏览器和HTTP服务器之间通过HTTP协议进行交互,所有的沟通交流都通过HTTP进行。
包括:信息传递,命令请求等,命令本身也是信息。

1. 石器时代
所有的网页都是静态html页面,服务器根据请求的URL,直接以http形式返回html文件内容。
eg.

Request:
GET /news/today.html
Host: 192.168.68.51:8000
Connection: keep-alive
User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36
Accept: image/webp,image/apng,image/*,*/*;q=0.8
Referer: http://192.168.68.51:8000/index.jsp
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.8,en;q=0.6


Response:
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Pragma: No-cache
Cache-Control: no-cache
Expires: Thu, 01 Jan 1970 00:00:02 GMT
Content-Type: image/jpeg;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 21 Jun 2018 04:57:27 GMT


<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="/styles/index.css?V=V808R08M03SP12">
<script type="text/javascript" src="/scripts/util.js?V=V808R08M03SP12"></script>
</head>
<body style="background-color: white;" onresize="setIndexTop();">
//////////////
</body>
</html>

 

2. 近现代
根据用户请求的URL选择shtml模板文件,使用动态信息替换模板中的特定位置,
如使用当前日期,替换文件中的<% date %>.
返回替换之后的文件内容。

用户请求的URL决定了选择的模板文件。


3. 现代

分工更明确,更细化。
HTTP Server处理HTTP协议,应用服务器执行处理程序。
AJAX进行异步处理。
URL对应到Action类,GET/POST/UPDATE/DELETE等方法对应到要执行的函数(RESTful);

 


三. 生命周期: Request/Response & Session & Application

这个针对服务端。

HTTP服务器和引用容器通常是一个应用里执行,进程启动时,Application即建立,在进程运行期间一直存在。

Session通常针对用户而言,用户无论是游客,还是登陆用户,通过浏览器第一次访问服务端时建立Session,
在之后的多次访问中,Session继续存在。一般情况下,Session会自动超时消失。用户登出时也会终止之前的Session。

浏览器每发起一次URL请求,都会创建和销毁Request/Response。


四. 应用容器的作用


PS.

请求MAC帧的内容,示例如下:

 

Packet Info
  Packet Number:        315
  Flags:                0x00000000
  Status:               0x00000000
  Packet Length:        667
  Timestamp:            13:53:12.025787000 06/21/2018
Ethernet Type 2
  Destination:          D4:AE:52:C6:74:97  Dell:C6:74:97  [0-5]
  Source:               34:17:EB:B7:09:4A  [6-11]
  Protocol Type:        0x0800  IP  [12-13]
IP Version 4 Header - Internet Protocol Datagram
  Version:              4  [14 Mask 0xF0]
  Header Length:        5  (20 bytes)  [14 Mask 0x0F]
  Diff. Services:       %00000000  [15]
                        0000 00.. Default
                        .... ..00 Not-ECT

  Total Length:         649  [16-17]
  Identifier:           8245  [18-19]
  Fragmentation Flags:  %010  [20 Mask 0xE0]
                        0.. Reserved
                        .1. Do Not Fragment
                        ..0 Last Fragment

  Fragment Offset:      0  (0 bytes)  [20-21 Mask 0x1FFF]
  Time To Live:         128  [22]
  Protocol:             6  TCP - Transmission Control Protocol  [23]
  Header Checksum:      0x0000  Checksum invalid. Should be:   0xCE3A  [24-25]
  Source IP Address:    192.168.68.124  [26-29]
  Dest. IP Address:     192.168.68.50  [30-33]
TCP - Transport Control Protocol
  Source Port:          53347  [34-35]
  Destination Port:     6080  [36-37]
  Sequence Number:      3277077179  [38-41]
  Ack Number:           2266623614  [42-45]
  TCP Offset:           5  (20 bytes)  [46 Mask 0xF0]
  Reserved:             %0000  [46 Mask 0x0F]
  TCP Flags:            %00011000  ...AP...  [47]
                        0... .... (No Congestion Window Reduction)
                        .0.. .... (No ECN-Echo)
                        ..0. .... (No Urgent pointer)
                        ...1 .... Ack
                        .... 1... Push
                        .... .0.. (No Reset)
                        .... ..0. (No SYN)
                        .... ...0 (No FIN)

  Window:               64240  [48-49]
  TCP Checksum:         0x0C7B  Checksum invalid. Should be:   0xD73D  [50-51]
  Urgent Pointer:       0  [52-53]
  No TCP Options
Application Layer
  Data Area:
  GET /xxxxxx/xx/x  47 45 54 20 2F 4E 4E 4E 4E 4E 4E 4E 4E 4E 4E 4E  [54-69]
  xxxx.aspx HTTP/1  6F 67 69 6E 2E 61 73 70 78 20 48 54 54 50 2F 31  [70-85]
  .1..Host: xxxxxx  2E 31 0D 0A 48 4E 4E 4E 4E 4E 4E 4E 4E 4E 4E 4E  [86-101]
  xxxxxxxxxxx:6080  69 64 75 63 74 4E 4E 4E 4E 4E 4E 4E 4E 4E 4E 4E  [102-117]
  ..Connection: ke  0D 0A 43 6F 6E 6E 65 63 74 69 6F 6E 3A 20 6B 65  [118-133]
  ep-alive..Upgrad  65 70 2D 61 6C 69 76 65 0D 0A 55 70 67 72 61 64  [134-149]
  e-Insecure-Reque  65 2D 49 6E 73 65 63 75 72 65 2D 52 65 71 75 65  [150-165]
  sts: 1..User-Age  73 74 73 3A 20 31 0D 0A 55 73 65 72 2D 41 67 65  [166-181]
  nt: Mozilla/5.0   6E 74 3A 20 4D 6F 7A 69 6C 6C 61 2F 35 2E 30 20  [182-197]
  (Windows NT 6.1)  28 57 69 6E 64 6F 77 73 20 4E 54 20 36 2E 31 29  [198-213]
   AppleWebKit/537  20 41 70 70 6C 65 57 65 62 4B 69 74 2F 35 33 37  [214-229]
  .36 (KHTML, like  2E 33 36 20 28 4B 48 54 4D 4C 2C 20 6C 69 6B 65  [230-245]
   Gecko) Chrome/6  20 47 65 63 6B 6F 29 20 43 68 72 6F 6D 65 2F 36  [246-261]
  0.0.3112.113 Saf  30 2E 30 2E 33 31 31 32 2E 31 31 33 20 53 61 66  [262-277]
  ari/537.36..Acce  61 72 69 2F 35 33 37 2E 33 36 0D 0A 41 63 63 65  [278-293]
  pt: text/html,ap  70 74 3A 20 74 65 78 74 2F 68 74 6D 6C 2C 61 70  [294-309]
  plication/xhtml+  70 6C 69 63 61 74 69 6F 6E 2F 78 68 74 6D 6C 2B  [310-325]
  xml,application/  78 6D 6C 2C 61 70 70 6C 69 63 61 74 69 6F 6E 2F  [326-341]
  xml;q=0.9,image/  78 6D 6C 3B 71 3D 30 2E 39 2C 69 6D 61 67 65 2F  [342-357]
  webp,image/apng,  77 65 62 70 2C 69 6D 61 67 65 2F 61 70 6E 67 2C  [358-373]
  */*;q=0.8..Accep  2A 2F 2A 3B 71 3D 30 2E 38 0D 0A 41 63 63 65 70  [374-389]
  t-Encoding: gzip  74 2D 45 6E 63 6F 64 69 6E 67 3A 20 67 7A 69 70  [390-405]
  , deflate..Accep  2C 20 64 65 66 6C 61 74 65 0D 0A 41 63 63 65 70  [406-421]
  t-Language: zh-C  74 2D 4C 61 6E 67 75 61 67 65 3A 20 7A 68 2D 43  [422-437]
  N,zh;q=0.8,en;q=  4E 2C 7A 68 3B 71 3D 30 2E 38 2C 65 6E 3B 71 3D  [438-453]
  0.6..Cookie: CCS  30 2E 36 0D 0A 43 6F 6F 6B 69 65 3A 20 43 43 53  [454-469]
  =; ASP.NET_Sessi  3D 3B 20 41 53 50 2E 4E 45 54 5F 53 65 73 73 69  [614-629]
  onId=14qdlj42ew1  6F 6E 49 64 3D 31 34 71 64 6C 6A 34 32 65 77 31  [630-645]
  1gzzc2sj5xp2u...  31 67 7A 7A 63 32 73 6A 35 78 70 32 75 0D 0A 0D  [646-661]
  .                 0A  [662]
FCS - Frame Check Sequence
  FCS:                  0xBFDC4562  Calculated

响应MAC帧内容,示例如下:

Packet Info
  Packet Number:        318
  Flags:                0x00000000
  Status:               0x00000000
  Packet Length:        1518
  Timestamp:            13:53:12.062176000 06/21/2018
Ethernet Type 2
  Destination:          34:17:EB:B7:09:4A  [0-5]
  Source:               D4:AE:52:C6:74:97  Dell:C6:74:97  [6-11]
  Protocol Type:        0x0800  IP  [12-13]
IP Version 4 Header - Internet Protocol Datagram
  Version:              4  [14 Mask 0xF0]
  Header Length:        5  (20 bytes)  [14 Mask 0x0F]
  Diff. Services:       %00000000  [15]
                        0000 00.. Default
                        .... ..00 Not-ECT

  Total Length:         1500  [16-17]
  Identifier:           17809  [18-19]
  Fragmentation Flags:  %010  [20 Mask 0xE0]
                        0.. Reserved
                        .1. Do Not Fragment
                        ..0 Last Fragment

  Fragment Offset:      0  (0 bytes)  [20-21 Mask 0x1FFF]
  Time To Live:         128  [22]
  Protocol:             6  TCP - Transmission Control Protocol  [23]
  Header Checksum:      0xA58B  [24-25]
  Source IP Address:    192.168.68.50  [26-29]
  Dest. IP Address:     192.168.68.124  [30-33]
TCP - Transport Control Protocol
  Source Port:          6080  [34-35]
  Destination Port:     53347  [36-37]
  Sequence Number:      2266623614  [38-41]
  Ack Number:           3277077788  [42-45]
  TCP Offset:           5  (20 bytes)  [46 Mask 0xF0]
  Reserved:             %0000  [46 Mask 0x0F]
  TCP Flags:            %00010000  ...A....  [47]
                        0... .... (No Congestion Window Reduction)
                        .0.. .... (No ECN-Echo)
                        ..0. .... (No Urgent pointer)
                        ...1 .... Ack
                        .... 0... (No Push)
                        .... .0.. (No Reset)
                        .... ..0. (No SYN)
                        .... ...0 (No FIN)

  Window:               64240  [48-49]
  TCP Checksum:         0xCD6F  [50-51]
  Urgent Pointer:       0  [52-53]
  No TCP Options
Application Layer
  Data Area:
  HTTP/1.1 200 OK.  48 54 54 50 2F 31 2E 31 20 32 30 30 20 4F 4B 0D  [54-69]
  .Cache-Control:   0A 43 61 63 68 65 2D 43 6F 6E 74 72 6F 6C 3A 20  [70-85]
  no-store..Pragma  6E 6F 2D 73 74 6F 72 65 0D 0A 50 72 61 67 6D 61  [86-101]
  : no-cache..Cont  3A 20 6E 6F 2D 63 61 63 68 65 0D 0A 43 6F 6E 74  [102-117]
  ent-Length: 4688  65 6E 74 2D 4C 65 6E 67 74 68 3A 20 34 36 38 38  [118-133]
  ..Content-Type:   0D 0A 43 6F 6E 74 65 6E 74 2D 54 79 70 65 3A 20  [134-149]
  text/html; chars  74 65 78 74 2F 68 74 6D 6C 3B 20 63 68 61 72 73  [150-165]
  et=gb2312..Expir  65 74 3D 67 62 32 33 31 32 0D 0A 45 78 70 69 72  [166-181]
  es: 0..Server: M  65 73 3A 20 30 0D 0A 53 65 72 76 65 72 3A 20 4D  [182-197]
  icrosoft-IIS/7.5  69 63 72 6F 73 6F 66 74 2D 49 49 53 2F 37 2E 35  [198-213]
  ..X-AspNet-Versi  0D 0A 58 2D 41 73 70 4E 65 74 2D 56 65 72 73 69  [214-229]
  on: 4.0.30319..P  6F 6E 3A 20 34 2E 30 2E 33 30 33 31 39 0D 0A 50  [230-245]
  3P: CP=CAO PSA O  33 50 3A 20 43 50 3D 43 41 4F 20 50 53 41 20 4F  [246-261]
  UR..P3P: CP=CAO   55 52 0D 0A 50 33 50 3A 20 43 50 3D 43 41 4F 20  [262-277]
  PSA OUR..X-Power  50 53 41 20 4F 55 52 0D 0A 58 2D 50 6F 77 65 72  [278-293]
  ed-By: ASP.NET..  65 64 2D 42 79 3A 20 41 53 50 2E 4E 45 54 0D 0A  [294-309]
  Date: Thu, 21 Ju  44 61 74 65 3A 20 54 68 75 2C 20 32 31 20 4A 75  [310-325]
  n 2018 05:51:52   6E 20 32 30 31 38 20 30 35 3A 35 31 3A 35 32 20  [326-341]
  GMT......<!DOCTY  47 4D 54 0D 0A 0D 0A 0D 0A 3C 21 44 4F 43 54 59  [342-357]
  PE html PUBLIC "  50 45 20 68 74 6D 6C 20 50 55 42 4C 49 43 20 22  [358-373]
  -//W3C//DTD XHTM  2D 2F 2F 57 33 43 2F 2F 44 54 44 20 58 48 54 4D  [374-389]
  L 1.0 Transition  4C 20 31 2E 30 20 54 72 61 6E 73 69 74 69 6F 6E  [390-405]
  al//EN" "http://  61 6C 2F 2F 45 4E 22 20 22 68 74 74 70 3A 2F 2F  [406-421]
  www.w3.org/TR/xh  77 77 77 2E 77 33 2E 6F 72 67 2F 54 52 2F 78 68  [422-437]
  tml1/DTD/xhtml1-  74 6D 6C 31 2F 44 54 44 2F 78 68 74 6D 6C 31 2D  [438-453]
  transitional.dtd  74 72 61 6E 73 69 74 69 6F 6E 61 6C 2E 64 74 64  [454-469]
  ">..<html xmlns=  22 3E 0D 0A 3C 68 74 6D 6C 20 78 6D 6C 6E 73 3D  [470-485]
  "http://www.w3.o  22 68 74 74 70 3A 2F 2F 77 77 77 2E 77 33 2E 6F  [486-501]
  rg/1999/xhtml">.  72 67 2F 31 39 39 39 2F 78 68 74 6D 6C 22 3E 0D  [502-517]
  .<head><title>..  0A 3C 68 65 61 64 3E 3C 74 69 74 6C 65 3E 0D 0A  [518-533]
  .......</title>.  09 B5 C7 C2 BD 0D 0A 3C 2F 74 69 74 6C 65 3E 0D  [534-549]
  .....    <script  0A 0D 0A 0D 0A 20 20 20 20 3C 73 63 72 69 70 74  [550-565]
   language="JavaS  20 6C 61 6E 67 75 61 67 65 3D 22 4A 61 76 61 53  [566-581]
  cript" src="./..  63 72 69 70 74 22 20 73 72 63 3D 22 2E 2F 2E 2E  [582-597]
  /Comm/JScript.js  2F 43 6F 6D 6D 2F 4A 53 63 72 69 70 74 2E 6A 73  [598-613]
  "></script>..     22 3E 3C 2F 73 63 72 69 70 74 3E 0D 0A 20 20 20  [614-629]
  <meta http-equiv  3C 6D 65 74 61 20 68 74 74 70 2D 65 71 75 69 76  [630-645]
  ="Page-Enter" co  3D 22 50 61 67 65 2D 45 6E 74 65 72 22 20 63 6F  [646-661]
  ntent="revealTra  6E 74 65 6E 74 3D 22 72 65 76 65 61 6C 54 72 61  [662-677]
  ns(duration=0.5,  6E 73 28 64 75 72 61 74 69 6F 6E 3D 30 2E 35 2C  [678-693]
   transition=8)"   20 74 72 61 6E 73 69 74 69 6F 6E 3D 38 29 22 20  [694-709]
  />..   <script l  2F 3E 0D 0A 20 20 20 3C 73 63 72 69 70 74 20 6C  [710-725]
  anguage="JavaScr  61 6E 67 75 61 67 65 3D 22 4A 61 76 61 53 63 72  [726-741]
  ipt" src="./../C  69 70 74 22 20 73 72 63 3D 22 2E 2F 2E 2E 2F 43  [742-757]
  omm/JS/Calendar/  6F 6D 6D 2F 4A 53 2F 43 61 6C 65 6E 64 61 72 2F  [758-773]
  WdatePicker.js"   57 64 61 74 65 50 69 63 6B 65 72 2E 6A 73 22 20  [774-789]
  defer="defer" ><  64 65 66 65 72 3D 22 64 65 66 65 72 22 20 3E 3C  [790-805]
  /script>..   <me  2F 73 63 72 69 70 74 3E 0D 0A 20 20 20 3C 6D 65  [806-821]
  ta http-equiv="C  74 61 20 68 74 74 70 2D 65 71 75 69 76 3D 22 43  [822-837]
  ache-Control" co  61 63 68 65 2D 43 6F 6E 74 72 6F 6C 22 20 63 6F  [838-853]
  ntent="no-store"  6E 74 65 6E 74 3D 22 6E 6F 2D 73 74 6F 72 65 22  [854-869]
   /><meta http-eq  20 2F 3E 3C 6D 65 74 61 20 68 74 74 70 2D 65 71  [870-885]
  uiv="Expires" co  75 69 76 3D 22 45 78 70 69 72 65 73 22 20 63 6F  [886-901]
  ntent="0" /><met  6E 74 65 6E 74 3D 22 30 22 20 2F 3E 3C 6D 65 74  [902-917]
  a http-equiv="Pr  61 20 68 74 74 70 2D 65 71 75 69 76 3D 22 50 72  [918-933]
  agma" content="n  61 67 6D 61 22 20 63 6F 6E 74 65 6E 74 3D 22 6E  [934-949]
  o-cache" />..<st  6F 2D 63 61 63 68 65 22 20 2F 3E 0D 0A 3C 73 74  [950-965]
  yle  type="text/  79 6C 65 20 20 74 79 70 65 3D 22 74 65 78 74 2F  [966-981]
  css">..body..{..  63 73 73 22 3E 0D 0A 62 6F 64 79 0D 0A 7B 0D 0A  [982-997]
  .margin: 0 auto;  09 6D 61 72 67 69 6E 3A 20 30 20 61 75 74 6F 3B  [998-1013]
  ...font-size: 14  0D 0A 09 66 6F 6E 74 2D 73 69 7A 65 3A 20 31 34  [1014-1029]
  px;...color: #00  70 78 3B 0D 0A 09 63 6F 6C 6F 72 3A 20 23 30 30  [1030-1045]
  0;...line-height  30 3B 0D 0A 09 6C 69 6E 65 2D 68 65 69 67 68 74  [1046-1061]
  : 20px;...font-f  3A 20 32 30 70 78 3B 0D 0A 09 66 6F 6E 74 2D 66  [1062-1077]
  amily: ....;...t  61 6D 69 6C 79 3A 20 CB CE CC E5 3B 0D 0A 09 74  [1078-1093]
  ext-align:center  65 78 74 2D 61 6C 69 67 6E 3A 63 65 6E 74 65 72  [1094-1109]
  ;...width:80%;..  3B 0D 0A 09 77 69 64 74 68 3A 38 30 25 3B 0D 0A  [1110-1125]
  }..       #ImgIc  7D 0D 0A 20 20 20 20 20 20 20 23 49 6D 67 49 63  [1126-1141]
  on..       {..    6F 6E 0D 0A 20 20 20 20 20 20 20 7B 0D 0A 20 20  [1142-1157]
       .width:8px;  20 20 20 20 20 09 77 69 64 74 68 3A 38 70 78 3B  [1158-1173]
  ..       .height  0D 0A 20 20 20 20 20 20 20 09 68 65 69 67 68 74  [1174-1189]
  :8px;..       }.  3A 38 70 78 3B 0D 0A 20 20 20 20 20 20 20 7D 0D  [1190-1205]
  ..Baner..{..      0A 2E 42 61 6E 65 72 0D 0A 7B 0D 0A 20 20 20 20  [1206-1221]
  text-align:cente  74 65 78 74 2D 61 6C 69 67 6E 3A 63 65 6E 74 65  [1222-1237]
  r;..}...Footer..  72 3B 0D 0A 7D 0D 0A 2E 46 6F 6F 74 65 72 0D 0A  [1238-1253]
  {..    text-alig  7B 0D 0A 20 20 20 20 74 65 78 74 2D 61 6C 69 67  [1254-1269]
  n:center;..    b  6E 3A 63 65 6E 74 65 72 3B 0D 0A 20 20 20 20 62  [1270-1285]
  ackground-color:  61 63 6B 67 72 6F 75 6E 64 2D 63 6F 6C 6F 72 3A  [1286-1301]
  Gray;..    font-  47 72 61 79 3B 0D 0A 20 20 20 20 66 6F 6E 74 2D  [1302-1317]
  style:normal;..   73 74 79 6C 65 3A 6E 6F 72 6D 61 6C 3B 0D 0A 20  [1318-1333]
      float:inheri  20 20 20 20 66 6C 6F 61 74 3A 69 6E 68 65 72 69  [1334-1349]
  t;..}...Main..{.  74 3B 0D 0A 7D 0D 0A 2E 4D 61 69 6E 0D 0A 7B 0D  [1350-1365]
  .    height:100%  0A 20 20 20 20 68 65 69 67 68 74 3A 31 30 30 25  [1366-1381]
  ;..}....div#Top.  3B 0D 0A 7D 0D 0A 0D 0A 64 69 76 23 54 6F 70 0D  [1382-1397]
  .{..    backgrou  0A 7B 0D 0A 20 20 20 20 62 61 63 6B 67 72 6F 75  [1398-1413]
  nd-position: rig  6E 64 2D 70 6F 73 69 74 69 6F 6E 3A 20 72 69 67  [1414-1429]
  ht center;..      68 74 20 63 65 6E 74 65 72 3B 0D 0A 20 20 20 20  [1430-1445]
  margin: 0px;..    6D 61 72 67 69 6E 3A 20 30 70 78 3B 0D 0A 20 20  [1446-1461]
    padding: 0px 3  20 20 70 61 64 64 69 6E 67 3A 20 30 70 78 20 33  [1462-1477]
  0px 0px 0px;..    30 70 78 20 30 70 78 20 30 70 78 3B 0D 0A 20 20  [1478-1493]
    height: 100%;.  20 20 68 65 69 67 68 74 3A 20 31 30 30 25 3B 0D  [1494-1509]
  .                 0A 20 20 20  [1510-1513]
FCS - Frame Check Sequence
  FCS:                  0xF481CF5F  Calculated

 

Web-从Java Request对象到HTTP协议

原文:https://www.cnblogs.com/wjcdx/p/9211373.html

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