研究 cookie
当你访问一些网站时,服务器会用 "cookies"(不同目的的文本片段)的形式发送信息到你的计算机.
访问一些网站会将 cookie 赋予变量 $Cookies.
用 URLRead 访问 Wolfram 和 Wolfram|Alpha 网站.
In[1]:=
![Click for copyable input](assets.zh/explore-cookies/In_76.png)
response1 = URLRead["wolfram.com"]
Out[1]=
![](assets.zh/explore-cookies/O_64.png)
In[2]:=
![Click for copyable input](assets.zh/explore-cookies/In_77.png)
response2 = URLRead["wolframalpha.com"]
Out[2]=
![](assets.zh/explore-cookies/O_65.png)
每个响应都包含一系列 cookie,分别以几个字段的关联的形式给出.
In[3]:=
![Click for copyable input](assets.zh/explore-cookies/In_78.png)
response1["Cookies"]
Out[3]=
![](assets.zh/explore-cookies/O_66.png)
In[4]:=
![Click for copyable input](assets.zh/explore-cookies/In_79.png)
response2["Cookies"]
Out[4]=
![](assets.zh/explore-cookies/O_67.png)
所有的 cookie 都存储在 $Cookies.
In[5]:=
![Click for copyable input](assets.zh/explore-cookies/In_80.png)
$Cookies
Out[5]=
![](assets.zh/explore-cookies/O_68.png)
找出与给定的域相关联的 cookie.
In[6]:=
![Click for copyable input](assets.zh/explore-cookies/In_81.png)
FindCookies["wolfram.com"]
Out[6]=
![](assets.zh/explore-cookies/O_69.png)
在给定进程中,发往服务器的后续请求在响应中不包括任何 cookie.
In[7]:=
![Click for copyable input](assets.zh/explore-cookies/In_82.png)
response3 = URLRead["wolframalpha.com"]
Out[7]=
![](assets.zh/explore-cookies/O_70.png)
In[8]:=
![Click for copyable input](assets.zh/explore-cookies/In_83.png)
response3["Cookies"]
Out[8]=
![](assets.zh/explore-cookies/O_71.png)