Referrer header required for django.contrib.gis.forms.widgets.OSMWidget

[diestl]

The OSMWidget does not set the referrer header (or does not configure open layers to set the referrer header) when making tile requests to the OSM tile server. As per the OSM tile usage policy (​https://operations.osmfoundation.org/policies/tiles/), these requests are being blocked.

The OSMWidget is the default widget used in the django admin interface when using the django.contrib.gis.admin.options.GISModelAdmin admin base class for geometry fields such as django.contrib.gis.db.models.PolygonField.

To reproduce this, you need a very simple model:

from django.contrib.gis.db import models


class TmpModel(models.Model):
    geometry = models.PolygonField(geography=True)

and admin:

from .models import TmpModel
from django.contrib.gis import admin


@admin.register(TmpModel)
class DatasetAdmin(admin.GISModelAdmin):
    pass

[diestl]

Screenshot illustrating the issue in the admin interface