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Editorial Team
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Asked: 2026-05-23T19:23:27+00:00

Cookie usernameCookie = new Cookie (username, attributeUsername); usernameCookie.setMaxAge(24*60*60); response.addCookie(usernameCookie); A cookie is created in

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Cookie usernameCookie = new Cookie ("username", attributeUsername);
usernameCookie.setMaxAge(24*60*60);
response.addCookie(usernameCookie);

A cookie is created in the server in this way and it is added to the HttpServletResponse .

Then why is it that , a HttpServletRequest Header contain cookies ??

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1 Answer

  1. Editorial Team

    Cookies are transmitted per request, example use case:

    1. The first client request does not contain cookies
    2. Server sets cookie A, it is transmitted back to the client in HTTP header Set-Cookie; this is what response.addCookie does.
    3. The second client request sends HTTP header Cookie containing a list of all matching cookies (including cookie A)

    Cookies are part of the HTTP protocol. Wikipedia provides a fine overview: http://en.wikipedia.org/wiki/HTTP_cookie

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