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    <p>Firstly, I suggest you don't worry about this issue. There is AMPLE room to serialize tons of identifiers to. </p> <p>Secondly it's not stored by <code>web-server</code> but by <code>web-domain</code> — e.g., <code>www.google.com</code> and not the 100's of different physical servers that serve the Google domain. </p> <p>Thirdly if you do have to worry know that there are <strong>two possible cookie headers</strong>. The sizes of these cookie headers are determined by the browser software limits.</p> <p><strong>Design Discussion</strong></p> <p>What you don't want to use the cookie header for is sending details about a client's session. E.g., don't try to stuff the email a client is typing into a cookie if you are building an email front-end. Instead you would send the client a cookie that represents his identity+session: you store all sessions data against this identity. You can store tens of identifiers (4–16 bytes) per cookie header and no one needs more than say 4 of these. The cookies data (as an integer) tends to be encoded to <a href="http://en.wikipedia.org/wiki/Base64" rel="nofollow noreferrer">base64</a> which increases the byte-count.</p> <p><strong>Performance</strong></p> <p>Your browser sends a plethora of headers to a web-server. The cookie is just another 100-1000 bytes (mostly closer to 100). At both extremes it takes only a fraction of time to send these to the web-server — when placed into context of course. You should keep in mind that the web is built on text based protocols.</p>
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    1. POWhat is the maximum size of a cookie, and how many can be stored in a browser for each web site?
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    1. USHassan Syed
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    1. POWhat is the maximum size of a cookie, and how many can be stored in a browser for each web site?
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    1. COThe cookie header is not only sent to request the html, but for all resources that is loaded from the same domain. So if a lot of data is stored in cookies, it will affect performance quite a bit. http://www.yuiblog.com/blog/2007/03/01/performance-research-part-3/
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    2. COwell yes, I am evidently not suggesting storing the combined works of Shakespeare in the cookie. People have the ability to exercise common sense when reading informal answers on stack overflow.
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    3. COAlso that analysis is completely useless in the general case. I have written high performance custom GUID based cookie generation code in my research and it adds NO extra latency. So you really need to learn how to interpret research based results and learn how to place them in context, instead of shoehorning the results which don't apply into this answer. To quote Saadi "Nothing is so good for an ignorant man as silence; and if he was sensible of this he would not be ignorant."
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