I wanted to be able to setup a reverse proxy with nginx and apache but continue using Virtualmin GPL to manage my domains. The only reason I wanted a reverse proxy is that several of the domains I host utilize a very large amount of images. I wanted a efficient way to handle these images since apache uses the same process to handle everything for the domain user and thus its memory footprint continued to grow till the process was killed. Thus I had processes using 150+ MB of memory just to serve a picture.
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