I have a very simple web app I’m testing out which is a webhook and accepts post requests. I uploaded the .py file called app.py. This is it’s contents:

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/webhook', methods=['POST'])
def webhook():
    data = request.get_json()
    print(data)
    return jsonify({'status': 'success'})

if __name__ == '__main__':
    app.run()

My Procfile has this written in it:

web: python app.py

And here’s my requirements.txt file contents (it automatically installs Python I don’t need to specify it):

Flask==3.0.3

When I deploy to Heroku, the build works fine, it detects that the Procfile type is web, and then when I type Heroku ps it even shows that the dynos are starting.

But then shortly after it crashes.

Any idea what this could be?

Thanks so much.