Django Sitemap on heroku error h13

[dum dum]

I don't know why,
in local
localhost:8000/sitemap.xml will generate sitemap.xml.

But on heroku, 
domain/sitemap.xml will error h13.

I followed this tutorial 

https://jawaban.online/scope/outlink/6442/django-sitemap-tutorial-help-crawlers-understand-your-website-2018-youtube/
and

https://medium.com/analytics-vidhya/django-sitemap-8f4ca0538fa

Any suggestions?

Thanks.

[dum dum]

Update for this case:
I fixed the h13 error by limiting records that I pulled from database. 

I still don't understand yet why heroku gave me that error, maybe because the server spec is not good enough for my data that has lot rows to pulled.

I'm using heroku hobby-basic.

Firefox: 

I open domain/sitemap.xml

sitemap.xml  page generated.

Chrome:

I open domain/sitemap.xml

redirected to "/" as I set for 404 page.

I did:
- Clear cache browsers and clear build cache on heroku.

- try to submit sitemap.xml on google search console in chrome and firefox. The results are the same. 

Couldn't fetch the data. Because it's redirected to "/".

Is anyone here ever experienced something like this?

Please kindly help, this problem got me tinkering around for months.

Thanks

[dum dum]

Anyone has solution for this issue?
Please let me know

Thanks

[Omkar Parab]

Put your code on github. I'll compare with my code. I've done sitemap for my site and it's working. 

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