I have a dashboard application written in Dash framework. It also has a few Restful API's written using flask. I am adding flask app to Dash server, as
import dash
import flask
import dash_bootstrap_components as dbc
flask_server = flask.Flask(__name__)
app = dash.Dash(__name__,server=flask_server, external_stylesheets=[dbc.themes.BOOTSTRAP])
And am running the server as
from dashboard import app
from waitress import serve
if __name__ == "__main__":
app.title = 'Litmus'
app.run_server(debug=False)
# serve(app,host="0.0.0.0",port=8050)
The above code works fine when I am using app.run_server(debug=False)
but it throws excetion when I use waitress to run the server. When I use following lines
#app.run_server(debug=False)
serve(app,host="0.0.0.0",port=8050)
I get following error
ERROR:waitress:Exception while serving /
Traceback (most recent call last):
File "C:\Users\litmus\AppData\Roaming\Python\Python38\site-packages\waitress\channel.py", line 397, in service
task.service()
File "C:\Users\litmus\AppData\Roaming\Python\Python38\site-packages\waitress\task.py", line 168, in service
self.execute()
File "C:\Users\litmus\AppData\Roaming\Python\Python38\site-packages\waitress\task.py", line 434, in execute
app_iter = self.channel.server.application(environ, start_response)
TypeError: 'Dash' object is not callable
ERROR:waitress:Exception while serving /favicon.ico
Traceback (most recent call last):
File "C:\Users\litmus\AppData\Roaming\Python\Python38\site-packages\waitress\channel.py", line 397, in service
task.service()
File "C:\Users\litmus\AppData\Roaming\Python\Python38\site-packages\waitress\task.py", line 168, in service
self.execute()
File "C:\Users\litmus\AppData\Roaming\Python\Python38\site-packages\waitress\task.py", line 434, in execute
app_iter = self.channel.server.application(environ, start_response)
TypeError: 'Dash' object is not callable
It's not working because you're passing the Dash app instead of the Flask app to serve
.
So instead of this:
serve(app,host="0.0.0.0",port=8050)
pass the Flask app instance like this:
serve(app.server, host="0.0.0.0", port=8050)
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