# `PrivatusAnalytics.Plug`
[🔗](https://github.com/Privatus-Analytics/elixir/blob/v1.0.0/lib/privatus_analytics/plug.ex#L2)

Adds the script tag just before `</head>` in HTML responses.

    # lib/my_app_web/router.ex
    pipeline :browser do
      # ...
      plug PrivatusAnalytics.Plug
    end

Adding the plug is the switch. It changes only responses with status 200,
a `text/html` content type and no `content-encoding` header. It skips Ajax
requests (`x-requested-with: XMLHttpRequest`), pages without a `</head>`, and
pages that already have the tag. It fixes the `content-length` header.

Options are the same as for `PrivatusAnalytics.tag/1`, for example
`plug PrivatusAnalytics.Plug, modules: ["engage", "auto"]`. The nonce is
read from `conn.assigns.csp_nonce` (change the name with `nonce_assign:`).

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*Consult [api-reference.md](api-reference.md) for complete listing*