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HTTP cookie
From Wikipedia, the free encyclopedia Jump to: navigation, search| HTTP |
| Persistence · Compression · HTTPS |
| Request methods |
| GET · POST · PUT · DELETE |
| Header fields |
| Cookie · ETag · Location · Referer |
| X-Forwarded-For |
| Status codes |
| 301 Moved permanently |
| 302 Found |
| 303 See Other |
| 403 Forbidden |
| 404 Not Found |
| This box: view · talk · edit |
A cookie, also known as a web cookie, browser cookie, and HTTP cookie, is a piece of text stored on a user's computer by their web browser. A cookie can be used for authentication, storing site preferences, shopping cart contents, the identifier for a server-based session, or anything else that can be accomplished through storing text data.
A cookie consists of one or more name-value pairs containing bits of information, which may be encrypted for information privacy and data security purposes. The cookie is sent as a field in the header of the HTTP response by a web server to a web browser and then sent back unchanged by the browser each time it accesses that server.
Cookies may be set by the server with or without an expiration date. Cookies without an expiration date exist until the browser terminates, while cookies with an expiration date may be stored by the browser until the expiration date passes. Users may also manually delete cookies in order to save space or to address privacy issues.
As text, cookies are not executable. Because they are not executed, they cannot replicate themselves and are not viruses. However, due to the browser mechanism to set and read cookies, they can be used as spyware (see zombie cookie and evercookie for more details). Anti-spyware products may warn users about some cookies because cookies can be used to track computer activity—a privacy concern, later causing possible malware.
Most modern browsers allow users to decide whether to accept cookies, and the time frame to keep them, but rejecting cookies makes some websites unusable.
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