Flask App Error while deploying to Heroku at=error code=H10 desc="App crashed" method=GET path="/"

Question

The sample flask app is giving error at=error code=H10 desc="App crashed" method=GET path="/" while deploying in Heroku.

Flaskapp.py

from flask import Flask

app = Flask(__name__)


@app.route('/')
def index():
    return "<h1> Deployed to Heroku</h1>"


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

Pocfile

web : gunicorn flaskapp:app

requirements.txt

Click==7.0
Flask==1.1.1
gunicorn==20.0.4
itsdangerous==1.1.0
Jinja2==2.10.3
MarkupSafe==1.1.1
Werkzeug==0.16.0

error log below

2020-01-10T10:35:14.658092+00:00 heroku[web.1]: Starting process with command `: gunicorn flaskapp:app`
2020-01-10T10:35:16.404755+00:00 heroku[web.1]: State changed from starting to crashed
2020-01-10T10:35:16.381754+00:00 heroku[web.1]: Process exited with status 0
2020-01-10T10:35:19.000000+00:00 app[api]: Build succeeded
2020-01-10T10:35:38.654704+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=flaskapp-te.herokuapp.com request_id=6712472d-a734-4720-b152-1e2716844c41 fwd="137.97.4.98" dyno= connect= service= status=503 bytes= protocol=https
2020-01-10T10:35:39.689766+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=flaskapp-te.herokuapp.com request_id=89a26803-5b09-4a94-99a2-5b0d154d7797 fwd="137.97.4.98" dyno= connect= service= status=503 bytes= protocol=https

followed some blogs and couldnt solve. Please assist

Answer 1

Modified the Procfile as mentioned in the below post to

web: gunicorn --bind 0.0.0.0:$PORT flaskapp:app