What is a cookie

<h6> Syntax Set-Cookie response header </ h6>
<pre> set-cookie = "Set-Cookie:" cookies
cookies = 1 # cookie
cookie = NAME "=" VALUE *(";" cookie-av)
NAME = attr
VALUE = value
cookie-av = "Comment" "=" value
| "Domain" "=" value
| "Max-Age" "=" value
| "Path" "=" value
| "Secure"
| "Version" "=" 1 * DIGIT </ pre>

<h5> NAME = VALUE </ h5>
Commitmenttelen. Name cookies - NAME, and its value - VALUE.
NAMEs that begin with an $ reserved
for other purposes and should not be used.
<br>
VALUE The value must be indifferent to the client and the server
can be set any value to the selected ASCII Kodirovke.
"any" means that the contents should be interested in
only the source server. In fact, it can be read
someone ktoanaliziruet Set-Cookie header.
<h5> Comment = comment </ h5>
Optional. Because cookies can contain private information
about a user, the Cookie attribute allows an origin server to
document its intended use of a cookie. The user can inspect the
information to decide whether to initiate or continue a session
with this cookie.
<h5> Domain = domain </ h5>
Nonbinding. The Domain attribute specifies the domain for
which the cookie is valid. An explicitly specified domain
must always start with a dot.
<h5> Max-Age = delta-seconds </ h5>
Optional. The Max-Age attribute defines the lifetime of the
cookie, in seconds. The delta-seconds value is a decimal non -
negative integer. After delta-seconds seconds elapse, the client
should discard the cookie. A value of zero means the cookie
should be discarded immediately.
<h5> Path = path </ h5>
Optional. The Path attribute specifiesthe subset of URLs to
which this cookie applies.
<h5> Secure </ h5>
Optional. The Secure attribute (with no value) directs the user
agent to use only (unspecified) secure means to contact the origin
server whenever it sends back this cookie.
<br>
what level of security it considers appropriate for "secure"
cookies. The Secure attribute should be considered security
advice from the server to the user agent, indicating that it is in
the session'sinterest to protect the cookie contents.
<h5> Version = version </ h5>
Required. The Version attribute, a decimal integer, identifies to
which version of the state management specification the cookie
conforms. For this specification, Version = 1 applies.

How do I set up Cook

1. Web server (when the appropriate settings)
   
2. Through the CGI response headers (like Perl, PHP, C, Sh)
   
3. Through a custom script (javascript as well as vbscript under IE4 +)
   

Setting cookies Apache server

CustomLog logs / clickstream "% (cookie) n% r% t"

1. CookieExpires
   
2. CookieName name of cookies (you can also specify in the. htaccess or directory)
   
3. CookieTracking on | off (you can also specify in the. Htaccess or directory)
   

Setting cookies CGI application

<pre> Set-Cookie:
name = value
[; EXPIRES = dateValue]
[; DOMAIN = domainName]
[; PATH = pathName]
[; SECURE] </ pre>

1. name = value to set the values for peremennnoy name value
   
2. [; EXPIRES = dateValue] if specified, it is the date when the cookie expires effect, ie it is deleted from the browser. If not specified, Cook cutaetsya after closing the browser window. In the latter case, Cook is often referred to as a sessional. Date format is:
   Wdy, DD-Mon-YY HH: MM: SS GMT
   
3. [; DOMAIN = domainName] If it is a domain in which the browser will send Kuku server. For example,If set to example.com, then Cook and send to example.com and pupkin.example.com. The default for the current domain.
   
4. [; PATH = pathName] If it is a virtual directory server, within the limits totorogo browser will send Cook. For example, if installed in / user, then Cook and send to example.com / user / and example.com / user / pupkin / but not in example.com / smith /. The default page of a virtual directory, whichsylaet Cook.
   

   When using cookies and <b> mod_rewrite </ b> Be careful! Set this option such as "/" otherwise the scripts are located in one directory will not be able to share cookies, because triggered via mod_rewrite. Also, the typical error --installation of cookies from a script in a subdirectory with the subsequent treatment of the script in the parent directory. If you do not set the PATH, Cook will not be available!

   
   
5. [; SECURE] if set, prevents the cookies on the unprotected channel. Is unprotectedare all protocols except https: / / The only browser that does not understand this directive - Konquerror
   

Setting cookies in PHP

Читание value cookies in PHP

Deleting cookies in PHP

Settingand reading cookies from javascript

Remember that not all clients support javascript, precisely not at all browser javascript is allowed

<script language="javascript">
function GetValue (Offset) (
var End = document.cookie. indexOf (";", Offset);
if (End ==- 1)
End = document.cookie.length;
return unescape (document.cookie.substring (Offset, End));
)

function GetCookie (Name) (
var Len = Name.length;
var i = 0;
while (i <document.cookie.length) (
var j = i + Len +1;
if(document.cookie.substring (i, j) == (Name +"="))
return GetValue (j);
i = document.cookie.indexOf ( "", 1) +1;
if (i == 0)
break;
)
return null;
)

function SetCookie (Name, Value, Expire) (
var Exp = "Friday ,25-Feb-2000 12:00:00 GMT";
document.cookie = Name +"="+ escape (value) + "; expires =" + Expire;
)

</ script>

Deleting cookies in javascript

Cook Caching proxy servers