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The httpcookies module provides server-side support for working with HTTP cookies In Python 2, the module is called Cookie Cookies are used to provide state management in servers that implement sessions, user logins, and related featuresTo drop a cookie on a user s browser, an HTTP server typically adds an HTTP header similar to the following to an HTTP response:
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Set-Cookie: session=8273612; expires=Sun, 18-Feb-2001 15:00:00 GMT; \ path=/; domain=foobarcom
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Alternatively, a cookie can be set by embedding JavaScript in the <head> section of an HTML document:
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<SCRIPT LANGUAGE="JavaScript"> documentcookie = "session=8273612; expires=Sun, 18-Feb-2001 15:00:00 GMT; \ Feb 17; Path=/; Domain=foobarcom;" </SCRIPT>
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The httpcookies module simplifies the task of generating cookie values by providing a special dictionary-like object which stores and manages collections of cookie values known as morsels Each morsel has a name, a value, and a set of optional attributes containing metadata to be supplied to the browser {expires, path, comment, domain, max-age, secure, version, httponly}The name is usually a simple identifier such as "name" and must not be the same as one of the metadata names such as "expires" or "path"The value is usually a short stringTo create a cookie, simply create a cookie object like this:
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c = SimpleCookie()
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Next, cookie values (morsels) can be set using ordinary dictionary assignment:
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c["session"] = 8273612 c["user"] = "beazley"
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Additional attributes of a specific morsel are set as follows:
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c["session"]["path"] = "/" c["session"]["domain"] = "foobarcom" c["session"]["expires"] = "18-Feb-2001 15:00:00 GMT"
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To create output representing the cookie data as a set of HTTP headers, use the coutput() method For example:
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print(coutput()) # Produces two lines of output # Set-Cookie: session=8273612; expires=; path=/; domain= # Set-Cookie: user=beazley
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When a browser sends a cookie back to an HTTP server, it is encoded as a string of key=value pairs, such as "session=8273612; user=beazley" Optional attributes such as expires, path, and domain are not returnedThe cookie string can usually be found in the HTTP_COOKIE environment variable, which can be read by CGI applicationsTo recover cookie values, use code similar to the following:
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c = SimpleCookie(osenviron["HTTP_COOKIE"]) session = c["session"]value user = c["user"]value
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The following documentation describes the SimpleCookie object in more detail
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SimpleCookie([input])
Defines a cookie object in which cookie values are stored as simple strings A cookie instance, c, provides the following methods:
coutput([attrs [,header [,sep]]])
Generates a string suitable for use in setting cookie values in HTTP headers attrs is an optional list of the optional attributes to include ("expires", "path", "domain", and so on) By default, all cookie attributes are included header is the HTTP header to use ('Set-Cookie:' by default) sep is the character used to join the headers together and is a newline by default
cjs_output([attrs])
Generates a string containing JavaScript code that will set the cookie if executed on a browser supporting JavaScript attrs is an optional list of the attributes to include
cload(rawdata)
Loads the cookie c with data found in rawdata If rawdata is a string, it s assumed to be in the same format as the HTTP_COOKIE environment variable in a CGI program If rawdata is a dictionary, each key-value pair is interpreted by setting c[key]=value Internally, the key/value pairs used to store a cookie value are instances of a Morsel class An instance, m, of Morsel behaves like a dictionary and allows the optional "expires", "path", "comment", "domain", "max-age", "secure", "version", and "httponly" keys to be set In addition, the morsel m has the following methods and attributes:
mvalue
A string containing the raw value of the cookie
mcoded_value
A string containing the encoded value of the cookie that would be sent to or received from the browser
mkey
The cookie name
mset(key,value,coded_value)
Sets the values of mkey, mvalue, and mcoded_value shown previously
misReservedKey(k)
Tests whether k is a reserved keyword, such as "expires", "path", "domain", and so on
moutput([attrs [,header]])
Produces the HTTP header string for this morsel attrs is an optional list of the additional attributes to include ("expires", "path", and so on) header is the header string to use ('Set-Cookie:' by default)
mjs_output([attrs])