Why does the plugin change the server header?

Normally, if you download and install Varnish (the source not the plugin) yourself, the headers will change to "Varnish." But our Varnish implementation is so aggressively modified and re-programmed at the code level (in order to extract every ounce of performance) that we must change the headers to indicate it. Changing the headers is best practices from a technical standpoint. Nevertheless, you can change these to your own header of choice by modifying the string in question in /etc/varnish/default.vcl for the Varnish Plugin or in the source code of Nginx in the file nginx-1.x.x/src/http/ngx_http_header_filter_module.c then search for the line with the string "Advanced Hosting" and change it (you'll then need to rebuid Nginx from source).
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