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Browser cookies have a very specific purpose: they are meant to store tiny bits of data and to pass that data to the web server on every request. Because they must be uploaded to the server along with every single request the browser makes, browsers limit cookies to a maximum size of 4 kilobytes per domain. Given this storage limitation and the fact that even a 4KB cookie is absolutely guaranteed
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This guide describes common security problems in web applications and how to avoid them with Rails. After reading this guide, you will know: How to use the built-in authentication generator. All countermeasures that are highlighted. The concept of sessions in Rails, what to put in there and popular attack methods. How just visiting a site can be a security problem (with CSRF). What you have to pay
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