Troubleshooting Zapier Webhook POSTING to Flask Server

Question

I am trying to use my Flask server to receive webhooks in a POST from a Zap, but I'm getting a 500 Internal Server Error when I test.

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 2073, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 1518, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 1516, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 1502, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
TypeError: receive_webhook() missing 1 required positional argument: 'request'

Here is my handler for the webhook:

@app.route("/webhook", methods=['POST'])
def receive_webhook(request):
    print(request.json)

    return request.json

Here's a screenshot of my Zap I am trying to send the POST from Thanks for any assistance.

It seems like Zapier is calling my handler with no argument. Shouldn’t it be passing the payload as that request argument or am I misunderstanding something here?

Edit: Also, if it's relevant, I'm using Nginx and Gunicorn for hosting. On an Ubuntu Linode.

Answer 1

I figured out the problem. I was using the Flask request module incorrectly. This code made it work -

@app.route("/webhook", methods=['POST'])
def receive_webhook():
    print(request.data)
    return request.data