Wireshark HTTP实验—Wireshark Lab: HTTP v7.0(计算机网络自顶向下第七版)-Toy模板网

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1. The Basic HTTP GET/response interaction

Is your browser running HTTP version 1.0 or 1.1? What version of HTTP is the server running?

浏览器与服务器的版本均为 $H TTP /1.1$ 。
What languages (if any) does your browser indicate that it can accept to the server?

Wireshark HTTP实验—Wireshark Lab: HTTP v7.0(计算机网络自顶向下第七版)

能接受简体中文以及英文。

What is the IP address of your computer? Of the gaia.cs.umass.edu server?

根据 $GET$ 消息的 $Des t ina t i o n$ 可知 $g aia . cs . u ma ss . e d u$ 的 $I P$ 地址为 $128.119.245.12$ 。

根据 $O K$ 消息的 $S o u rce$ 可知本机 $I P$ 地址为 $114.214.246.244$ 。
What is the status code returned from the server to your browser?

返回 $status\ code = 200$ ，正常状态。
When was the HTML file that you are retrieving last modified at the server?

上次修改时间为 $2022$ 年 $9$ 月 $14$ 日，星期三， $5$ 时 $59$ 分 $01$ 秒。
How many bytes of content are being returned to your browser?

内容大小为 $128 b y t es$ 。
By inspecting the raw data in the packet content window, do you see any headers within the data that are not displayed in the packet-listing window? If so, name one.

查看包信息与列表，没有找到未出现的报头。

Inspect the contents of the first HTTP GET request from your browser to the server. Do you see an “IF-MODIFIED-SINCE” line in the HTTP GET?

查看 $GET$ 报文，未找到 $I F - MO D I F I E D - S I NCE$ 。
Inspect the contents of the server response. Did the server explicitly return the contents of the file? How can you tell?

在本机浏览器缓存已清空的情况下，向服务器发送第一个 $GET$ 请求后，服务器的响应信息包含文件具体内容。

但立即发送第二个 $GET$ 请求，服务器回复的内容中不含 $He a d er$ 为 $Line-based\ text\ data$ 的信息，即服务器并未返回具体的文件内容。因为在第一次访问时浏览器目标网站成功后，浏览器已有了网页内容的缓存，在下一次访问时，当网站内容尚未更新，便会直接从浏览器缓存中获取，因此无需服务器返回具体的文件内容。
Now inspect the contents of the second HTTP GET request from your browser to the server. Do you see an “IF-MODIFIED-SINCE:” line in the HTTP GET? If so, what information follows the “IF-MODIFIED-SINCE:” header?

在 $Hypertext\ Transfer\ Protocol$ 中找到了 $I F - MO D I F I E D - S I NCE$ 消息，包含的信息为上一次服务器响应信息的更改时间。

What is the HTTP status code and phrase returned from the server in response to this second HTTP GET? Did the server explicitly return the contents of the file? Explain.

$status\ code = 304, phrase = Not\ Modified$ ，表示未发生改变，直接调用缓存中已有的文本。利用缓存可以减轻服务器压力，提高效率。

How many HTTP GET request messages did your browser send? Which packet number in the trace contains the GET message for the Bill or Rights?

浏览器仅发送了一个 $HTTP\ GET$ 请求消息，序号为 $213$ 。
Which packet number in the trace contains the status code and phrase associated with the response to the HTTP GET request?

序号为 $238$ 的响应报文包含了响应 $HTTP\ GET$ 请求的状态码和短语。
What is the status code and phrase in the response?

$ status\ code=200,phrase=OK$，表示正常响应状态。
How many data-containing TCP segments were needed to carry the single HTTP response and the text of the Bill of Rights?

需要4个 $TCP$ 报文段。

How many HTTP GET request messages did your browser send? To which Internet addresses were these GET requests sent?

发送了 $3$ 个服务器请求，消息中的 $Full\ request\ URI$ 就是请求的网站。
Can you tell whether your browser downloaded the two images serially, or whether they were downloaded from the two web sites in parallel? Explain.

在第一张图片下载请求得到响应后，才发出下载第二张图片的请求，所以图片下载是串行的。

What is the server’s response (status code and phrase) in response to the initia HTTP GET message from your browser?

Wireshark HTTP实验—Wireshark Lab: HTTP v7.0(计算机网络自顶向下第七版)

$response :\  status\ code = 401,phrase=Unauthorized$，表示未经授权，因为此页面需要登录认证。

When your browser’s sends the HTTP GET message for the second time, what new field is included in the HTTP GET message.

新增了 $A u t h or i z a t i o n$ 字段，此字段与登录验证的用户名密码相关。文章来源地址https://www.toymoban.com/news/detail-475053.html

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