Dash Deployment on IIS as application under website

Dash Python
1

Hello, I am attempting to deploy a Dash application on a windows server running IIS. I am following the tutorial here. I have successfully deployed the Dash application as a website on IIS. I am now attempting to deploy the same Dash application on IIS as an application underneath a top-level website. Unfortunately, I am seeing some JavaScript errors when the page attempts to load.

Note, I have added a requests_pathname_prefix=’/dash/’ to the line of Python code where I am creating my DASH app object. After this change I am seeing the below errors being thrown in the JavaScript console when attempting to load the page.

polyfill@7.v1_8_3m1615231646.8.7.min.js:1 Uncaught SyntaxError: Unexpected token ‘<’
react@16.v1_8_3m1615231646.14.0.min.js:1 Uncaught SyntaxError: Unexpected token ‘<’
react-dom@16.v1_8_3m1615231646.14.0.min.js:1 Uncaught SyntaxError: Unexpected token ‘<’
prop-types@15.v1_8_3m1615231646.7.2.min.js:1 Uncaught SyntaxError: Unexpected token ‘<’
dash_daq.v0_5_0m1615231770.min.js:1 Uncaught SyntaxError: Unexpected token ‘<’
dash_html_components.v1_1_1m1615231646.min.js:1 Uncaught SyntaxError: Unexpected token ‘<’
bundle.v4_11_1m1615231646.js:1 Uncaught SyntaxError: Unexpected token ‘<’
dash_core_components.v1_14_1m1615231649.min.js:1 Uncaught SyntaxError: Unexpected token ‘<’
dash_core_components-shared.v1_14_1m1615231649.js:1 Uncaught SyntaxError: Unexpected token ‘<’
dash_renderer.v1_8_3m1615231646.min.js:1 Uncaught SyntaxError: Unexpected token ‘<’
history_sales_rep:30 Uncaught ReferenceError: DashRenderer is not defined
at history_sales_rep:30
(anonymous) @ history_sales_rep:30

Any insight as to how to eliminate these errors or if it is possible to run Dash on IIS as an application under a website would be appreciated. Thanks.

2

For anyone stuck on the same issue. The solution that worked for me was to change from the requests_pathname_prefix parameter to the url_base_pathname parameter.

Previous - Did not function
#app = dash.Dash(server = server, suppress_callback_exceptions=True, requests_pathname_prefix=’/dash/’)

Modified - Worked!
app = dash.Dash(server = server, suppress_callback_exceptions=True, url_base_pathname=’/dash/’)