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CGI
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===
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If all other deployment methods do not work, CGI will work for sure. CGI
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is supported by all major servers but usually has a less-than-optimal
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performance.
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This is also the way you can use a Flask application on Google's
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`App Engine`_, there however the execution does happen in a CGI-like
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environment. The application's performance is unaffected because of that.
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.. admonition:: Watch Out
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Please make sure in advance that your ``app.run()`` call you might
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have in your application file, is inside an ``if __name__ ==
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'__main__':`` or moved to a separate file. Just make sure it's not
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called because this will always start a local WSGI server which we do
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not want if we deploy that application to CGI / app engine.
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.. _App Engine: http://code.google.com/appengine/
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Creating a `.cgi` file
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----------------------
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First you need to create the CGI application file. Let's call it
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`yourapplication.cgi`::
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#!/usr/bin/python
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from wsgiref.handlers import CGIHandler
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from yourapplication import app
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CGIHandler().run(app)
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If you're running Python 2.4 you will need the :mod:`wsgiref` package. Python
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2.5 and higher ship this as part of the standard library.
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Server Setup
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------------
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Usually there are two ways to configure the server. Either just copy the
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`.cgi` into a `cgi-bin` (and use `mod_rerwite` or something similar to
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rewrite the URL) or let the server point to the file directly.
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In Apache for example you can put a like like this into the config:
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.. sourcecode:: apache
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ScriptAlias /app /path/to/the/application.cgi
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For more information consult the documentation of your webserver.
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