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Reverse proxying an external application isn't always as trivial as just proxy_pass in vhost.conf and go - we recently moved our company blog from blog.picklive.com to picklive.com/blog and it caused issues with WordPress relating to cookies for the admin control panel and invalid cookies set by WordPress caused us huge problems with our actual app.

These issues were fixed by doing slightly more complicated proxying rules and by filtering the cookies as part of the proxying.

Reverse proxying is a really powerful technique (you could sit things like mod_security in front of your relatively vulnerable WordPress install, for example), but unless you have an experienced sysadmin on hand to help if it all goes wrong it's probably not something you want to try based solely on an infographic.

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