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CGI
===
If all other deployment methods do not work, CGI will work for sure. CGI
is supported by all major servers but usually has a less-than-optimal
performance.
This is also the way you can use a Flask application on Google's
`App Engine`_, there however the execution does happen in a CGI-like
environment. The application's performance is unaffected because of that.
.. admonition:: Watch Out
Please make sure in advance that your ``app.run()`` call you might
have in your application file, is inside an ``if __name__ ==
'__main__':`` or moved to a separate file. Just make sure it's not
called because this will always start a local WSGI server which we do
not want if we deploy that application to CGI / app engine.
.. _App Engine: http://code.google.com/appengine/
Creating a `.cgi` file
----------------------
First you need to create the CGI application file. Let's call it
`yourapplication.cgi`::
#!/usr/bin/python
from wsgiref.handlers import CGIHandler
from yourapplication import app
CGIHandler().run(app)
Server Setup
------------
Usually there are two ways to configure the server. Either just copy the
`.cgi` into a `cgi-bin` (and use `mod_rewrite` or something similar to
rewrite the URL) or let the server point to the file directly.
In Apache for example you can put a like like this into the config:
.. sourcecode:: apache
ScriptAlias /app /path/to/the/application.cgi
For more information consult the documentation of your webserver.