Why does django set the Content-Range header in some cases and not in others?

Question

Django

Good day, there is a page on which 3 tracks are loaded via ajax
Under the hood is django with something like this output:

response = HttpResponse(json.dumps(data, ensure_ascii=False), content_type="application/json")
response["Accept-Range"] = "bytes"
return response

But this construction gives exactly the same results as the previous one:

return HttpResponse(json.dumps(data, ensure_ascii=False), content_type="application/json")

Namely: only to one track (and then every other time) the Content-Range header is attached, to the other two - not at all
. Please tell me what the automation of this process in django depends on and tell me what I'm doing wrong