configuring nginx to work with python3.2

Question

I'm having some trouble configuring nginx to work with Python3.2. I'm also struggling to find anything resembling a decent tutorial on the subject. I did however find a decent tutorial on getting nginx to play nice with Python2.7. My thought process was that since uwsgi works with plugins it should be a relatively simple exercise to follow the Python2.7 tutorial and just swap out the python plugin.

Here is the tutorial I followed to get a basic Hello World site working: https://library.linode.com/web-servers/nginx/python-uwsgi/ubuntu-12.04-precise-pangolin

/etc/uwsgi/apps_available/my_site_url.xml looks like:

<uwsgi>
    <plugin>python</plugin>
    <socket>/run/uwsgi/app/my_site_urlmy_site_url.socket</socket>
    <pythonpath>/srv/www/my_site_url/application/</pythonpath>
    <app mountpoint="/">
        <script>wsgi_configuration_module</script>
    </app>
    <master/>
    <processes>4</processes>
    <harakiri>60</harakiri>
    <reload-mercy>8</reload-mercy>
    <cpu-affinity>1</cpu-affinity>
    <stats>/tmp/stats.socket</stats>
    <max-requests>2000</max-requests>
    <limit-as>512</limit-as>
    <reload-on-as>256</reload-on-as>
    <reload-on-rss>192</reload-on-rss>
    <no-orphans/>
    <vacuum/>
</uwsgi>

Once everything was working installed uwsgi-plugin-python3 via apt-get. ls -l /usr/lib/uwsgi/plugins/ now outputs:

-rw-r--r-- 1 root root 142936 Jul 17  2012 python27_plugin.so
-rw-r--r-- 1 root root 147192 Jul 17  2012 python32_plugin.so
lrwxrwxrwx 1 root root     38 May 17 11:44 python3_plugin.so -> /etc/alternatives/uwsgi-plugin-python3
lrwxrwxrwx 1 root root     37 May 18 12:14 python_plugin.so -> /etc/alternatives/uwsgi-plugin-python

Changing python to python3 or python32 in my_site_url.xml has the same effect, ie:

The hello world page takes ages to load (it was effectively instantanious before) and then comes up blank
My site's access log records access
my site's error log records no new error
/var/log/uwsgi/app/my_site_url.log records the following:

[pid: 4503|app: 0|req: 1/2] 192.168.1.5 () {42 vars in 630 bytes} [Sun May 19 10:49:12 2013] GET / => generated 0 bytes in 0 msecs (HTTP/1.1 200) 2 headers in 65 bytes (1 switches on core 0)

so My question is:

How can I correctly configure this app to work on Python3.2

Sheena Sheena · Accepted Answer · 2013-05-19T09:18:40

The listed tutorial has the following application code:

def application(environ, start_response):
    status = '200 OK'
    output = 'Hello World!'

    response_headers = [('Content-type', 'text/plain'),
                    ('Content-Length', str(len(output)))]
    start_response(status, response_headers)

    return [output]

This is incompatable with python3.2 because it expects a bytes object. Replacing the application function with the following fixes things:

def application(env, start_response):
    start_response('200 OK', [('Content-Type','text/html')])
    return b"Hello World"

configuring nginx to work with python3.2

1 Answers