: An HTTP cookie is a piece of data stored by the user's web browser. Unless otherwise specified, cookies can be created, read, modified and deleted both by JavaScript and by server-side scripts
An HTTP cookie is a piece of data stored by the user's web browser. Unless otherwise specified, cookies can be created, read, modified and deleted both by JavaScript and by server-side scripts by reading the headers.
Cookie access control is based on domain, (optionally) path and (optionally) URL scheme (http: vs. https:). The rules governing cookies are not the same as the access control rules of the DOM in JavaScript which are based on the same domain policy, but because cookie access is mostly based on domain name, they are sometimes confused with the usual HTTP same domain policy.
The behaviour of HTTP cookies in real life browsers is not described in any RFC (thus quoting a RFC to describe cookies is almost always wrong). The various RFC are of historical interest.
Browsers are recommended to allow at least 20 cookies per domain and 4KB per cookie. If you are looking for an alternative to cookies that aren't sent in HTTP headers and can store more data, consider localStorage.
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