20.22. Cookie — HTTP 状态管理 ¶

注意

The Cookie module has been renamed to http.cookies in Python 3. The 2to3 tool will automatically adapt imports when converting your sources to Python 3.

源代码： Lib/Cookie.py

The Cookie module defines classes for abstracting the concept of cookies, an HTTP state management mechanism. It supports both simple string-only cookies, and provides an abstraction for having any serializable data-type as cookie value.

The module formerly strictly applied the parsing rules described in the RFC 2109 and RFC 2068 specifications. It has since been discovered that MSIE 3.0x doesn’t follow the character rules outlined in those specs and also many current day browsers and servers have relaxed parsing rules when comes to Cookie handling. As a result, the parsing rules used are a bit less strict.

字符集， string.ascii_letters , string.digits and !#$%&'*+-.^_`|~ denote the set of valid characters allowed by this module in Cookie name (as key ).

注意

当遇到无效 Cookie 时， CookieError is raised, so if your cookie data comes from a browser you should always prepare for invalid data and catch CookieError on parsing.

exception Cookie. CookieError ¶

Exception failing because of RFC 2109 invalidity: incorrect attributes, incorrect Set-Cookie header, etc.

class Cookie. BaseCookie ( [ input ] ) ¶

This class is a dictionary-like object whose keys are strings and whose values are Morsel instances. Note that upon setting a key to a value, the value is first converted to a Morsel containing the key and the value.

若 input 有给定，会被传递给 load() 方法。

class Cookie. SimpleCookie ( [ input ] ) ¶

此类派生自 BaseCookie 和覆写 value_decode() and value_encode() to be the identity and str() 分别。

class Cookie. SerialCookie ( [ input ] ) ¶

此类派生自 BaseCookie 和覆写 value_decode() and value_encode() to be the pickle.loads() and pickle.dumps() .

从 2.3 版起弃用： Reading pickled values from untrusted cookie data is a huge security hole, as pickle strings can be crafted to cause arbitrary code to execute on your server. It is supported for backwards compatibility only, and may eventually go away.

class Cookie. SmartCookie ( [ input ] ) ¶

此类派生自 BaseCookie . It overrides value_decode() 到 pickle.loads() if it is a valid pickle, and otherwise the value itself. It overrides value_encode() 到 pickle.dumps() unless it is a string, in which case it returns the value itself.

从 2.3 版起弃用： The same security warning from SerialCookie applies here.

A further security note is warranted. For backwards compatibility, the Cookie module exports a class named Cookie which is just an alias for SmartCookie . This is probably a mistake and will likely be removed in a future version. You should not use the Cookie class in your applications, for the same reason why you should not use the SerialCookie 类。

另请参阅

模块 cookielib

HTTP cookie handling for web clients 。 cookielib and Cookie 模块不相互依赖。

RFC 2109 - HTTP 状态管理机制

这是由此模块实现的状态管理规范。

20.22.1. Cookie 对象 ¶

BaseCookie. value_decode ( val ) ¶

Return a decoded value from a string representation. Return value can be any type. This method does nothing in BaseCookie — it exists so it can be overridden.

BaseCookie. value_encode ( val ) ¶

Return an encoded value. val can be any type, but return value must be a string. This method does nothing in BaseCookie — it exists so it can be overridden.

In general, it should be the case that value_encode() and value_decode() are inverses on the range of value_decode .

BaseCookie. output ( [ attrs [ , header [ , sep ] ] ] ) ¶

Return a string representation suitable to be sent as HTTP headers. attrs and header are sent to each Morsel ’s output() 方法。 sep is used to join the headers together, and is by default the combination '\r\n' (CRLF).

Changed in version 2.5: The default separator has been changed from '\n' to match the cookie specification.

BaseCookie. js_output ( [ attrs ] ) ¶

Return an embeddable JavaScript snippet, which, if run on a browser which supports JavaScript, will act the same as if the HTTP headers was sent.

The meaning for attrs is the same as in output() .

BaseCookie. load ( rawdata ) ¶

若 rawdata is a string, parse it as an HTTP_COOKIE and add the values found there as Morsel s. If it is a dictionary, it is equivalent to:

for k, v in rawdata.items():
    cookie[k] = v
						

20.22.2. Morsel 对象 ¶

class Cookie. Morsel ¶

抽象键/值对，有一些 RFC 2109 属性。

Morsels are dictionary-like objects, whose set of keys is constant — the valid RFC 2109 attributes, which are

• expires

• path

• comment

• domain

• max-age

• secure

• version

• httponly

属性 httponly specifies that the cookie is only transferred in HTTP requests, and is not accessible through JavaScript. This is intended to mitigate some forms of cross-site scripting.

The keys are case-insensitive.

2.6 版新增： The httponly 属性被添加。

Morsel. 值 ¶

Cookie 的值。

Morsel. coded_value ¶

The encoded value of the cookie — this is what should be sent.

Morsel. key ¶

Cookie 的名称。

Morsel. set ( key , 值 , coded_value ) ¶

设置 key , value and coded_value 属性。

Morsel. isReservedKey ( K ) ¶

Whether K is a member of the set of keys of a Morsel .

Morsel. output ( [ attrs [ , header ] ] ) ¶

Return a string representation of the Morsel, suitable to be sent as an HTTP header. By default, all the attributes are included, unless attrs is given, in which case it should be a list of attributes to use. header is by default "Set-Cookie:" .

Morsel. js_output ( [ attrs ] ) ¶

Return an embeddable JavaScript snippet, which, if run on a browser which supports JavaScript, will act the same as if the HTTP header was sent.

The meaning for attrs is the same as in output() .

Morsel. OutputString ( [ attrs ] ) ¶

Return a string representing the Morsel, without any surrounding HTTP or JavaScript.

The meaning for attrs is the same as in output() .

20.22.3. 范例 ¶

以下范例演示如何使用 Cookie 模块。

>>> import Cookie
>>> C = Cookie.SimpleCookie()
>>> C["fig"] = "newton"
>>> C["sugar"] = "wafer"
>>> print C # generate HTTP headers
Set-Cookie: fig=newton
Set-Cookie: sugar=wafer
>>> print C.output() # same thing
Set-Cookie: fig=newton
Set-Cookie: sugar=wafer
>>> C = Cookie.SimpleCookie()
>>> C["rocky"] = "road"
>>> C["rocky"]["path"] = "/cookie"
>>> print C.output(header="Cookie:")
Cookie: rocky=road; Path=/cookie
>>> print C.output(attrs=[], header="Cookie:")
Cookie: rocky=road
>>> C = Cookie.SimpleCookie()
>>> C.load("chips=ahoy; vienna=finger") # load from a string (HTTP header)
>>> print C
Set-Cookie: chips=ahoy
Set-Cookie: vienna=finger
>>> C = Cookie.SimpleCookie()
>>> C.load('keebler="E=everybody; L=\\"Loves\\"; fudge=\\012;";')
>>> print C
Set-Cookie: keebler="E=everybody; L=\"Loves\"; fudge=\012;"
>>> C = Cookie.SimpleCookie()
>>> C["oreo"] = "doublestuff"
>>> C["oreo"]["path"] = "/"
>>> print C
Set-Cookie: oreo=doublestuff; Path=/
>>> C["twix"] = "none for you"
>>> C["twix"].value
'none for you'
>>> C = Cookie.SimpleCookie()
>>> C["number"] = 7 # equivalent to C["number"] = str(7)
>>> C["string"] = "seven"
>>> C["number"].value
'7'
>>> C["string"].value
'seven'
>>> print C
Set-Cookie: number=7
Set-Cookie: string=seven
>>> # SerialCookie and SmartCookie are deprecated
>>> # using it can cause security loopholes in your code.
>>> C = Cookie.SerialCookie()
>>> C["number"] = 7
>>> C["string"] = "seven"
>>> C["number"].value
7
>>> C["string"].value
'seven'
>>> print C
Set-Cookie: number="I7\012."
Set-Cookie: string="S'seven'\012p1\012."
>>> C = Cookie.SmartCookie()
>>> C["number"] = 7
>>> C["string"] = "seven"
>>> C["number"].value
7
>>> C["string"].value
'seven'
>>> print C
Set-Cookie: number="I7\012."
Set-Cookie: string=seven