You can find the solution here:
https://github.com/poblabs/weewx-belchertown/issues/881Download version v10.3.3 of Highcharts
and use these files locally and web space:
highstock.js
highstock.js.map
highcharts-more.js
highcharts-more.js.map
exporting.js
exporting.js.map
offline-exporting.js
offline-exporting.js.map
solid-gauge.js
solid-gauge.js.map
In addition to roe-dl solution, you also need "offline-exporting".
Necessary change in header.html.tmpl (my change: I use /
js/highcharts/ )
The corresponding files must of course also be located on the web space:
#if $page != "kiosk"
<script type='text/javascript' src='$relative_url/js/highcharts/highstock.js'></script>
<script type='text/javascript' src='$relative_url/js/highcharts/highcharts-more.js'></script>
<script type='text/javascript' src='$relative_url/js/highcharts/exporting.js'></script>
<script type='text/javascript' src='$relative_url/js/highcharts/offline-exporting.js'></script>
<script type='text/javascript' src='$relative_url/js/highcharts/solid-gauge.js'></script>
##<script type='text/javascript' src='//code.highcharts.com/stock/10/highstock.js'></script>
##<script type='text/javascript' src='//code.highcharts.com/10/highcharts-more.js'></script>
##<script type='text/javascript' src='//code.highcharts.com/10/modules/exporting.js'></script>
##<script type='text/javascript' src='//code.highcharts.com/10/modules/solid-gauge.js'></script>
#end if