Expose Flask server for Azure App Service deployment with gunicorn

Author: m20l22

app.py

@@ -16,6 +16,7 @@
 """try and accept for imports to get rid of deprecation warning"""
 
 app = dash.Dash(__name__, external_stylesheets=[dbc.themes.BOOTSTRAP])
+server = app.server  # Expose the Flask server for Azure App Service (gunicorn entry point)
 
 
 # Fetch prices from local CSV using pandas
@@ -436,4 +437,6 @@ def update_scatter_plot(all_tickers, price):
 
 
 if __name__ == "__main__":
-    app.run_server(debug=True)
+    debug = os.environ.get("DASH_DEBUG", "false").lower() == "true"
+    port = int(os.environ.get("PORT", 8050))
+    app.run_server(debug=debug, host="0.0.0.0", port=port)

requirements.txt

@@ -2,3 +2,4 @@ dash==2.16.0
 dash_bootstrap_components==1.5.0
 pandas==2.2.1
 plotly==5.24.1
+gunicorn==22.0.0

startup.txt

@@ -0,0 +1 @@
+gunicorn --bind=0.0.0.0 --timeout 600 app:server