Detect web handler: mod_wsgi, fast_CGI, fcgid, mod_python or CGI and display many informations.

• python_test.py displays many informations.
• python_test_mini.py is smaller and displays less informations.

Put the files .htaccess, python_test.py and/or python_test_mini.py into your htdocs directory. Change .htaccess for your needs.

The test script can run a SCGI Server, too. It's use the flup packages for this. To start a SCGI Server on localhost:4000 run this:

./python_test.py scgi

or specify bidn address and port:

./python_test.py scgi 127.0.0.1 8888

Add SCGIMount to your VirtualHost config, e.g.:

<VirtualHost>
    ... 
    SCGIMount / 127.0.0.1:4000
    ...
</VirtualHost>

The test script write some logs into a log file. The problem is, to find a place for this log file. Depending on the user that runs the process, we have different file write rights and we try to find a filepath in which we can write out log output.

We try to create a log file in these directories:

• same directory as test script
• tempfile.gettempdir()
• /tmp
• /tmp

How to find out what the handler is running script?

if __name__.startswith('_mod_wsgi_'):
    # we running with mod_wsgi

or:

if sys.argv[0] == "mod_wsgi":
    # we running with mod_wsgi

see also: https://code.google.com/p/modwsgi/wiki/TipsAndTricks#Determining_If_Running_Under_mod_wsgi

if __name__.startswith('_mp_'):
    # we running with mod_python

or:

if sys.argv[0] == "mod_python":
    # we running with mod_python

This have i seen on the internet, but not tested:

if sys.argv[0] == "scgi-wsgi":
    # we running with SCGI

(See SCGI section above.)

It seems to be difficult to keep them apart. The current solution looks like this:

if __name__ == "__main__":
    if "CGI" in os.environ.get("GATEWAY_INTERFACE", ""):
        # normal CGI
    elif "PATH" in os.environ:
        # New libapache2-mod-fcgid Apache module
    else:
        # Old libapache2-mod-fastcgi Apache module

Does anyone have a better idea?

copyleft 2011 by Jens Diemer

license: GNU GPL v3 or above