On Wed, Jun 17, 2015 at 9:50 PM, James Reeves <ja...@booleanknot.com> wrote:

> On 17 June 2015 at 09:51, Thomas Heller <th.hel...@gmail.com> wrote:
>>
>> On another note: Sessions in cookies should be VERY VERY small.
>> java.io.Serializable usually isn't small and especially if you go java
>> object -> binary -> base64 -> base64 (yes twice) -> encrypt. The size of
>> the cookie matters as it is transmitted with EVERY request.
>>
>
> The cookie is only transmitted when the session changes. However, several
> browsers place limits on the size of stored cookies, and so it's generally
> not a good idea to serialize anything large into a cookie.
>


They are transmitted for every request client -> server. If you host
images/css/js on the same host each request will contain the cookie. 2kb
cookie for 100 requests (quite common for webapps) and all the
optimizations done to keep javascript small go out the window.

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