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 services.nginx.httpConfig =

    let
      indexHtml = pkgs.writeTextFile {
        name = "index.html";
        text = ''
          <h2>Hello, world!</h2>
        '';
      };
      webpageRoot = pkgs.stdenv.mkDerivation {
          name = "public_html";

          phases = [ "installPhase" ];

          installPhase = ''
            mkdir -p $out
            cp -v ${indexHtml} $out/index.html
          '';
      };
    in

  ''
        server {
                location / {
                        root ${webpageRoot};
                }
        }
  '' ;