Cookies are a general mechanism which server side connections (such as CGIscripts) can use to both store and retrieve information on the client side of the connection.
If a cookie has already passed domain matching, then the pathname component of the URL is compared with the path attribute, and if there is a match, the cookie is considered valid and is sent along with the URL request.
When a cookie larger than 4 kilobytes is encountered the cookie should be trimmed to fit, but the name should remain intact as long as it is less than 4 kilobytes.
The request-port of a cookie is the request-port of the request in which a Set-Cookie2 response header was returned to the user agent.
To handle cached cookies correctly, a client SHOULD calculate the age of the cookie according to the age calculation rules in the HTTP/1.1 specification [RFC2616].
An infrequently-used cookie may function as a "preferences file" for network applications, and a user may wish to keep it even if it is the least-recently-used cookie.
Because it was used in Netscape's original implementation of state management, we will use the term cookie to refer to the state information that passes between an origin server and user agent, and that gets stored by the user agent.
Currently, HTTPservers respond to each client request without relating that request to previous or subsequent requests; the technique allows clients and servers that wish to exchange state information to place HTTP requests and responses within a larger context, which we term a "session".
User agent makes request to victim.cracker.edu again, and passes Cookie: $Version="1"; session_id="1234"; session_id="1111"; $Domain=".cracker.edu" The server at victim.cracker.edu should detect that the second cookie was not one it originated by noticing that the Domain attribute is not for itself and ignore it.
HTTPcookies, sometimes known as webcookies or just cookies, are parcels of text sent by a server to a webbrowser and then sent back unchanged by the browser each time it accesses that server.
HTTPcookies are used for authenticating, tracking, and maintaining specific information about users, such as site preferences and the contents of their electronic shopping carts.
Cookies were invented for realising a virtual shopping basket: this is a virtual device in which the user can "place" items to purchase, so that users can navigate a site where items are shown, adding or removing items from the shopping basket at any time.
Non-persistent cookies are maintained for the duration of the current session, and therefore, cannot be accessed at a later time.
Because a cookie lives on the hard drive of the computer to which it was originally transmitted, problems can occur for organizations who advocate computer sharing, such as a university.
Cookies can only tell a webserver if you have been there before and can pass short bits of information (such as a user number) from the webserver back to itself the next time you visit.
By using HTTP-only cookies, a Web site eliminates the possibility that sensitive information contained in the cookie can be sent to a hacker's computer or Web site with script.
A cookie is set on the client with an HTTP response header.
The cookie cannot be accessed through script in Internet Explorer 6SP1, even by the Web site that set the cookie in the first place.
HTTPCookie Library is a Perl 4 and 5 compatible library which allows you to easily use Persistent Client StateHTTPCookies by allowing you to get the cookies from the environment, set cookies, cookies, compress multiple cookies into one, change the expiration date, domain and path, and more all with easy subroutine calls.
HTTPCookie Library can be downloaded in several different formats, or you can even have it mailed to you as a uuencoded file.
The following is a drop-in replacement for HTTPCookie Library developed by a project called nms.
The server sets a cookie in an HTTP response, while the client provides its cookies to the server-side application during an HTTP request.
When a script requests an url from an HTTPserver, the browser matches the URL against all cookies (which were previously loaded from the client's hard drive to its memory), and if any of them match, a line containing the
A cookie can be up to 4KB, including its name and value, which is exactly 4000 characters.
Kristol & Montulli Standards Track [Page 12] RFC 2965 HTTPState Management Mechanism October 2000 Max-Age Selection Cookies that have expired should have been discarded and thus are not forwarded to an origin server.
Kristol & Montulli Standards Track [Page 14] RFC 2965 HTTPState Management Mechanism October 2000 3.5 Caching Proxy Role One reason for separating state information from both a URL and document content is to facilitate the scaling that caching permits.
Kristol & Montulli Standards Track [Page 23] RFC 2965 HTTPState Management Mechanism October 2000 A user agent that supports both this specification and Netscape-style cookies SHOULD send a Cookie request header that follows the older Netscape specification if it received the cookie in a Set-Cookie response header and not in a Set-Cookie2 response header.
www.ietf.org /rfc/rfc2965.txt (6582 words)
An HTTP Cookie Parser in Java(Site not responding. Last check: 2007-10-10)
This class parses the "Cookie:"HTTP request line and makes individual URL-decoded cookie values available in a lookup table with the name as a key.
Uses CssChoices.java internally, plus needs a simple shell script to act as a CGI interface (Unix; use a similar.bat file on Windows).
CssTest -- An on-line demonstration of the cookie parser in action.
Every time a test PC was connected to the internet, it was targeted by viruses and attempts to gain access to the information it contained..." [Guardian]
spyware, anti-spyware, remover, internet security, cookies, anti-virus, spam blocker, privacy
Text Links: [ Home ] [ News ] [ Cookies ] [ Software ] [ FAQ ] [ Active FAQ ] [ Crypto ] [ Message Board ] [ About ] [ fonts ] [ free fonts ]
www.cookiecentral.com (427 words)
Rex Swain's HTTP Cookie Demo(Site not responding. Last check: 2007-10-10)
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See my home page for other summaries and demos: APL, REXX, XEDIT, Perl, HTML, RGB Colors, HTTPCookies, Email Forms, CGI Environment Variables, Server Side Includes, etc...
