Exporting as png does not work reliable

[alexstaicu35]

The png exporting functionality of the library does not seem to work 100% of the time

I included an example very similar to the one given by the library in which i try to export the same graph as png 100 times (bubble0.png, bubble1.png, ... , bubble99.png). Some of the images generated are not proper pngs (when trying to open them the following error is shown: Fatal error reading PNG image file: Not a PNG file )
test.zip

[alexstaicu35]

I think this is related to being rate limited https://export.highcharts.com/ after a while if i try to save many highcharts. Is there any way to work around this?

[jmishra01]

@alexstaicu35 We have to setup export server locally using node and highchart export js library.