Django Crispy Forms Cancel Button That Sends User Back A Page

I have a Django Crispy Form that I want to add a cancel button to. Unlike the answers here and here, however, the user can get to the form via multiple pages, so I need to send them back to the page they came from if they cancel, not send them to a static page. How can I accomplish this?

Figured it out. Simple javascript embed in an anchor tag of <a href="javascript:history.back()"> got it done. Here's the full context:

class SetForm(forms.ModelForm):
    class Meta:
        model = #blah blah
        fields = #blah blah 

    helper = FormHelper()
    helper.form_method = 'POST'

    helper.layout = Layout(
        # other inputs blah blah

        Row(
            Column(HTML('<a class="btn btn-warning form-group" href="javascript:history.back()">Cancel</a>')),
            Column(Submit('submit', 'Submit', css_class='btn btn-primary form-group')),
        )
    )

Hope this helps save someone else the time.