yarn install
yarn start

"start": "npm run themesconfig && webpack-dev-server --progress --colors --host <ip_addr> --port <port>"

{
  "themes": {
    "items": [
      {
        "url": "<http://localhost/wms/theme>",
        "title": "<Custom theme title>",            // optional, use WMS title if not set
        "thumbnail": "<filename>",                  // optional image file in assets/img/mapthumbs, if not set uses WMS GetMap to generate the thumbnail and stores it in assets/img/mapthumbs
        "attribution": "<Attribution>",             // optional theme attribution
        "attributionUrl": "<attribution URL>",      // optional theme attribution URL
        "default": true,                            // optional, set this as the initial theme
        "scales": [25000, 10000, 5000, 2500],       // optional, custom map scales, defaults to defaultScales (see below)
        "printScales": [25000, 10000, 5000, 2500],  // optional, confined list of available print scales, defaults to defaultPrintScales (see below)
        "printResolutions": [150, 300, 600],        // optional, confined list of abailable print resolutions, defaults to defaultPrintResolutions (see below)
        "printGrid": [                              // optional, list of grid intervals to use for various scales when printing.
            {"s": 10000, x: 1000, y: 1000},         //   Keep this list sorted in descending order by scale (s)
            {"s": 1000, x: 100, y: 100},            //   In this example, {x: 100, y: 100} will be used for 1000 <= scale < 10000
            ...                                     //   If not specified, defaultPrintGrid will be usd (see below)
        ],
        "printLabelForSearchResult": "<labelid>"    // optional, a labelid in the print composition where to insert the label of the selected search result
        "printLabelConfig": {                       // optional, configuration of input textareas for print composition labels.
            "labelId": {
                "rows": 4,
                "maxLength: "40"
              },
              ...
        }
        "extent": [xmin, ymin, xmax, ymax],         // optional custom extent which overrides extent from WMS capabilities
        "tiled": true,                              // optional, use tiled WMS (default is false)
        "format": "image/png",                      // optional, the image format to use in the WMS request, defaults to image/png
        "backgroundLayers": [                       // optional background layers
          {
            "name": "<background layer name>",      // background layer name from list below
            "printLayer": "<qgis layer name>",      // optional, name of a qgis layer to use as equivalent background layer when printing
            "visibility": true                      // optional initial visibility on topic selection
          }
        ],
        "searchProviders": ["<search provider>"],   // optional search providers
        "mapCrs: "EPSG:3857",                       // optional, the map projection, defaults to EPSG:3857
        "additionalMouseCrs": ["<epsg code>"]       // optional list of additional CRS for mouse position (map projection and WGS84 are listed by default). Make sure proj defs are loaded in js/appConfig.js.
        "watermark": {                              // optional, configuration of watermark to place on raster-export images
          "text": "<watermark text>",
          "texpadding": "1",                        // optional, padding between text and frame, in points
          "fontsize": "14",                         // optional, font size
          "fontfamily": "sans",                     // optional, font family
          "fontcolor": "#0000FF",                   // optional, font color
          "backgroundcolor": "#FFFFFF",             // optional, background color of the frame
          "framecolor": "#000000",                  // optional, color of the frame border
          "framewidth": 1                           // optional, width of the frame border, in pixels
        },
        "collapseLayerGroupsBelowLevel": <level>    // optional, layer tree level below which to initially collapse groups. If unspecified, groups are not initially collapsed.
        "skipEmptyFeatureAttributes": true          // optional, whether to skip empty feature attributes in the identify results. Default is false.
      }
    ],
    "groups": [                                     // optional, nested groups
      {
        "title": "<Group title>",
        "items": [
          {
            "url": "<http://localhost/wms/group_theme>"
          }
        ]
        "groups": [
          // subgroups
        ]
      }
    ],
    "backgroundLayers": [                           // optional list of background layers for themes
      {
        "name": "<background layer name>",          // referenced by themes
        "title": "<Background layer title>",
        "thumbnail": "<filename>",                  // optional image file in assets/img/mapthumbs, use default.jpg if not set
        ...                                         // layer params (excluding "group" and "visibility")
      }
    ]
  },
  "defaultScales": [50000, 25000, 10000, 5000],     // required, default map scales
  "defaultPrintScales": [50000, 25000, 10000, 5000],// optional, confined list of available print scales. If not specified, scale is freely choosable.
  "defaultPrintResolutions": [150, 300, 600],       // optional, confined list of abailable print resolutions. If not specified, resolution is freely choosable.
  "defaultPrintGrid": [<as printGrid above>]        // optional, list of grid intervals to use for various scales when printing, no grid is primted if omitted
}

yarn run prod

SetEnvIf Request_URI "^/wms.*/(.+)$" project_name=$1
Header always setifempty Content-Disposition "attachment; filename=%{project_name}e.pdf" "expr=%{CONTENT_TYPE} = 'application/pdf'"

a2enmod setenvif
a2enmod headers