[mod_python] WSGI Behavioral differences: mod_python vs mod_wsgi

Thu Jul 30 12:40:36 EDT 2009

Running Apache 2.2.4; mod_python 3.3.1; Python 2.4.

Experiencing behavioral problems with WSGI on mod_python. I'm running the exact same code but mod_wsgi works and mod_python does not.
Here's the code which is the same in 2 files: myapp.wsgi; and myapp.py...
def application(environ, start_response):
    status = '200 OK'
    output = '<html><body>\n'
    tbl = """<table border="5">"""
    for k,v in environ.items():
        tbl += "\n<tr><td>%s</td><td>%s</td></tr>" % (k,v)
    tbl += "\n</table>"
    curpath = environ.get('PATH_INFO', '/')
    if curpath == '/maintenance/':
        output += '<h1>Maintenance page</h1>'
    else:
        output += """<h1>Hell!! Oh... Whirled!</h1>
<a href="/myapp/maintenance/" target="_blank">Maintenance</a> <br />\n"""
    output += """%(tbl)s\n</body></html>""" % locals()
    response_headers = [('Content-type', 'text/html'),
                        ('Content-Length', str(len(output)))]
    start_response(status, response_headers)
    return [output]

The mod_wsgi implementation "routes" to the link properly but the mod_python version does not. With other tests it seems like environ is not in sync when using mod_python. I tried single process mode Apache and experienced the same problem.

For the mod_python handler I've tried the 2 known versions from: Nicholas Borko; and Eli Collins. Both exhibit the same behavior.

Is there some secret Apache directive needed to force mod_python to sync up? Here's how Apache is setup:
<VirtualHost modwsgi:80>
    ServerName modwsgi
    ServerAlias modwsgi.local
    DocumentRoot /home/hydra/docroot/modwsgi
    WSGIScriptAlias /myapp /home/hydra/modwsgi/myapp.wsgi
    <Directory /home/hydra/docroot/modwsgi>
        Order allow,deny
        Allow from all
    </Directory>
    <Directory /home/hydra/modwsgi>
        Order allow,deny
        Allow from all
    </Directory>
</VirtualHost>

<VirtualHost modpython:80>
    ServerName modpython
    ServerAlias modpython.local
    DocumentRoot /home/hydra/docroot/modwsgi
    ScriptAlias /myapp /home/hydra/modwsgi/
    <Directory /home/hydra/docroot/modwsgi>
        Order allow,deny
        Allow from all
    </Directory>
    <Directory /home/hydra/modwsgi>
        SetHandler python-program
        PythonHandler wsgi_handler
        PythonOption WSGI.Application myapp::application
        Order allow,deny
        Allow from all
    </Directory>
</VirtualHost>

Is this a handler problem or a mod_python implementation problem? Or a problem with my understanding?

What do you recommend?

Thanks!

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