WSGI file for a Dash / Plotly app with no hard coded paths. Picks up the "prefix" for DASH through the WSGI environment variable SCRIPT_NAME and uses the virtualenv "venv"

dash.wsgi

import os
import sys

my_directory=os.path.dirname(__file__)

if my_directory not in sys.path:
    sys.path.insert(0,my_directory)

# Virtual Environment (./venv)
activate_this = os.path.join(my_directory, 'venv', 'bin', 'activate_this.py')
execfile(activate_this, dict(__file__=activate_this))

from index import app, server

# MyDashApp - Calls "server" after setting prefix
# SCRIPT_NAME is WSGIScriptAlias
class MyDashApp:

    def __init__(self, application):
        self.__application = application

    def __call__(self, environ, start_response):
        if environ.has_key('SCRIPT_NAME'):
            prefix = str(environ['SCRIPT_NAME'])
            if not prefix.endswith('/'):
                prefix = prefix + '/'
            app.config.requests_pathname_prefix = prefix
            app.config.routes_pathname_prefix = prefix

        return self.__application(environ, start_response)

application = MyDashApp(server)

example_dash.conf

<VirtualHost *>
    ServerName localhost.localdomain

    WSGIDaemonProcess dashboard user=dashboard group=dashboard threads=5
    WSGIScriptAlias /dashboard /apps/dashboard/dashboard.wsgi

    <Directory /apps/dashboard>
        WSGIProcessGroup dashboard
        WSGIApplicationGroup %{GLOBAL}
        Require all granted
    </Directory>
</VirtualHost>