[Fixed]-Django how to send a argument in handler404?

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I don’t think you need a custom handler404 view here. Django’s page_not_found view does what you want.

In Django 1.9+, you can include {{ exception }} in the 404 template.

In your view, you could set the message when raising the exception, for example:

from django.http import Http404

def my_view(request):
    raise Http404('custom error message')

It doesn’t make sense to set response.status_code in the handler – if it’s handler404, then the status code should always be 404.