[Python] What is the difference between request.GET.get('username') and...

I want to know the difference between this two methods of getting data

Just tried to figure it out for the object concepts of this data fetching... I saw request.GET.get('username') used in customauth.py at the time of custom authentication and request.META.get('HTTP_X_ USERNAME') saw in DRF documentation where the custom authentication example is given.

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