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The purpose of the middleware class "noCacheMiddleware" featured in this post, is to void the back button effects after a logout action takes place. In other words, by using this class, we can build password-protected web applications that do not exhibit the common back button problem. This problem happens with protected pages are being shown when end users click on the back button after they have logged out. The solution to this "back button after logout" problem requires using this class together with the Redirect-after-post pattern.