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Connecting Flask to Apache

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When exploring the cosmos of python powered web frameworks it’s easy to get lost due to fast moving versions. Recently we had a lot of difficulty getting Flask connected via a WSGI script on Apache. This seems to be due to needing the object factory to be called specifically rather than relying on the module namespace to do the work for us, there doesn’t seem to be much help online about this yet. We’re also running python in a virtualenv so the working wsgi script looks like this:

#!/usr/bin/python                                                               
import sys
import logging
import os

logging.basicConfig(stream=sys.stderr)
PROJECT_DIR = "/var/www/yourflasksite/"
activate_this = os.path.join(PROJECT_DIR, 'bin', 'activate_this.py')
execfile(activate_this, dict(__file__=activate_this))

sys.path.append(PROJECT_DIR)
from app import create_app
application=create_app(os.getenv('FLASK_CONFIG') or 'default')
application.secret_key = 'your site's key'

For completeness, here is the apache config that starts it up:

<VirtualHost *:80>
    ServerName your.url
    WSGIScriptAlias / /var/www/yourflasksite/yoursite.wsgi
    <Directory /var/www/yourflasksite/app>
	Order allow,deny
        Allow from all
    </Directory>
    Alias /static /var/www/yourflasksite/app/static
    <Directory /var/www/yourflasksite/app/static/>
        Order allow,deny
        Allow from all
    </Directory>
    ErrorLog ${APACHE_LOG_DIR}/yourflasksite-error.log
    LogLevel warn
    CustomLog ${APACHE_LOG_DIR}/yourflasksite-access.log 
</VirtualHost>

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