Excellent

With the help of this plugin you can manage security headers easily. Really well done.
But you need to know what you are doing and you need to read a lot of documentation about http headers to understand the meaning of every option.
With my little knowledge of http headers security i moved from grade F to D in less than 5 minutes. But i think i’ve done 10% of the work, maybe less.
I wish there was a paid service to configure this plugin.