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<H1><A NAME="SECTION00131700000000000000000">
11.17 <tt class="module">Cookie</tt> --
         HTTP state management</A>
</H1>

<P>


<P>
The <tt class="module">Cookie</tt> module defines classes for abstracting the concept of 
cookies, an HTTP state management mechanism. It supports both simplistic
string-only cookies, and provides an abstraction for having any serializable
data-type as cookie value.

<P>
The module formerly strictly applied the parsing rules described in in
the <a class="rfc" name="rfcref-47296"
href="javascript:if(confirm('http://www.ietf.org/rfc/rfc2109.txt  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.ietf.org/rfc/rfc2109.txt'" tppabs="http://www.ietf.org/rfc/rfc2109.txt">RFC 2109 <img src="offsite.gif" tppabs="http://www.python.org/doc/current/icons/offsite.gif"
  border='0' class='offsitelink' height='15' width='17' alt='[off-site link]'
  ></a> and <a class="rfc" name="rfcref-47298"
href="javascript:if(confirm('http://www.ietf.org/rfc/rfc2068.txt  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.ietf.org/rfc/rfc2068.txt'" tppabs="http://www.ietf.org/rfc/rfc2068.txt">RFC 2068 <img src="offsite.gif" tppabs="http://www.python.org/doc/current/icons/offsite.gif"
  border='0' class='offsitelink' height='15' width='17' alt='[off-site link]'
  ></a> specifications.  It has since been discovered
that MSIE 3.0x doesn't follow the character rules outlined in those
specs.  As a result, the parsing rules used are a bit less strict.

<P>
<dl><dt><b><a name='l2h-2269'><tt class='exception'>CookieError</tt></a></b>
<dd>
Exception failing because of <a class="rfc" name="rfcref-47300"
href="javascript:if(confirm('http://www.ietf.org/rfc/rfc2109.txt  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.ietf.org/rfc/rfc2109.txt'" tppabs="http://www.ietf.org/rfc/rfc2109.txt">RFC 2109 <img src="offsite.gif" tppabs="http://www.python.org/doc/current/icons/offsite.gif"
  border='0' class='offsitelink' height='15' width='17' alt='[off-site link]'
  ></a> invalidity: incorrect
attributes, incorrect <code>Set-Cookie</code> header, etc.
</dl>

<P>
<dl><dt><b><a name='l2h-2270'><tt class='class'>BaseCookie</tt></a></b> (<big>[</big><var>input</var><big>]</big>)
<dd>
This class is a dictionary-like object whose keys are strings and
whose values are <tt class="class">Morsel</tt>s. Note that upon setting a key to
a value, the value is first converted to a <tt class="class">Morsel</tt> containing
the key and the value.

<P>
If <var>input</var> is given, it is passed to the <tt class="method">load</tt> method.
</dl>

<P>
<dl><dt><b><a name='l2h-2271'><tt class='class'>SimpleCookie</tt></a></b> (<big>[</big><var>input</var><big>]</big>)
<dd>
This class derives from <tt class="class">BaseCookie</tt> and overrides <tt class="method">value_decode</tt>
and <tt class="method">value_encode</tt> to be the identity and <tt class="function">str()</tt> respectively.
</dl>

<P>
<dl><dt><b><a name='l2h-2272'><tt class='class'>SerialCookie</tt></a></b> (<big>[</big><var>input</var><big>]</big>)
<dd>
This class derives from <tt class="class">BaseCookie</tt> and overrides <tt class="method">value_decode</tt>
and <tt class="method">value_encode</tt> to be the <tt class="function">pickle.loads()</tt> and 
<tt class="function">pickle.dumps</tt>.  

<P>
Do not use this class.  Reading pickled values from a cookie is a
security hole, as arbitrary client-code can be run on
<tt class="function">pickle.loads()</tt>.  It is supported for backwards
compatibility.

<P>
</dl>

<P>
<dl><dt><b><a name='l2h-2273'><tt class='class'>SmartCookie</tt></a></b> (<big>[</big><var>input</var><big>]</big>)
<dd>
This class derives from <tt class="class">BaseCookie</tt>. It overrides <tt class="method">value_decode</tt>
to be <tt class="function">pickle.loads()</tt> if it is a valid pickle, and otherwise
the value itself. It overrides <tt class="method">value_encode</tt> to be 
<tt class="function">pickle.dumps()</tt> unless it is a string, in which case it returns
the value itself.

<P>
The same security warning from <tt class="class">SerialCookie</tt> applies here.
</dl>

<P>
<div class='seealso'>
  <p class='heading'><b>See Also:</b></p>

  <dl compact class="seerfc">
    <dt><a href="javascript:if(confirm('http://www.ietf.org/rfc/rfc2109.txt  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.ietf.org/rfc/rfc2109.txt'" tppabs="http://www.ietf.org/rfc/rfc2109.txt"
        title="HTTP State Management Mechanism"
        >RFC 2109, <em>HTTP State Management Mechanism</em> <img src="offsite.gif" tppabs="http://www.python.org/doc/current/icons/offsite.gif"
  border='0' class='offsitelink' height='15' width='17' alt='[off-site link]'
  ></a>
    <dd>This is the state
                management specification implemented by this module.
  </dl>
</div>

<P>

<p><hr>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>

<UL>
<LI><A NAME="tex2html4242"
  href="cookie-objects.html" tppabs="http://www.python.org/doc/current/lib/cookie-objects.html">11.17.1 Cookie Objects </A>
<LI><A NAME="tex2html4243"
  href="morsel-objects.html" tppabs="http://www.python.org/doc/current/lib/morsel-objects.html">11.17.2 Morsel Objects </A>
<LI><A NAME="tex2html4244"
  href="cookie-example.html" tppabs="http://www.python.org/doc/current/lib/cookie-example.html">11.17.3 Example </A>
</UL>
<!--End of Table of Child-Links-->

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