Resolve "Webhooks backend and web-frontend"

Merge Request Checklist

• changelog.md has been updated if required
• Documentation has been updated
• Quality Standards are met
• The UI/UX has been updated following UI Style Guide
• The redoc API pages have been updated for any REST API changes
• The per database user API docs page has been updated for any REST API changes made to endpoints which can be accessed via a user created token
• Has performance been considered and tested when appropriate? Ideally Baserow should be performant when working with hundreds of thousands of rows
• New/Changed Premium features are separated correctly in the premium folder
• There are tests for and it has been checked that any changed/new django ORM code is sensible, doesn't perform N queries and that table models are not generated needlessly or generated with all columns when only a few are needed.

Closes #257 (closed)

Tips for testing

To test everything I temporarily added the following test code to api/urls.py:

import json
from django.urls import re_path
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.permissions import AllowAny
class Tmp(APIView):
    permission_classes = (AllowAny,)
    def get(self, request):
        print(request.headers)
        parsed = json.loads(request.body)
        print(json.dumps(parsed, indent=4))
        return Response({}, status=200)

...

urlpatterns = (
    [
        re_path("tmp", Tmp.as_view(), name="tmp"),
        ...
    ]
)

What you want to do it start a second Django development server by doing:

docker exec -it baserow_backend_1 bash
python src/baserow/manage.py runserver 0.0.0.0:8001

Because the Django development server only has one worker, this will make sure that when doing a test call the development server is not waiting on itself.

Not you can create a webhook with the following url: http://localhost:8001/api/tmp and use the test button to make a test call. When actually using the webhook, you need manually change the URL in the database to http://backend:8001/api/tmp. By changing the response in the Tmp view, you can test all kinds of scenario's.

• Test a not OK response code.
• Test an endpoint that can't be reached.
• Test a URL that can't be revolved.
• Test an OK endpoint.