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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 sub-optimal
+performance.
+
+This is also the way you can use a Flask application on Google's `App
+Engine`_, where execution happens in a CGI-like environment.
+
+.. admonition:: Watch Out
+
+ Please make sure in advance that any ``app.run()`` calls you might
+ have in your application file are inside an ``if __name__ ==
+ '__main__':`` block 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.
+
+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.
+
+.. _App Engine: http://code.google.com/appengine/