[Web-SIG] Sample WSGI server

[Phillip J. Eby]

FYI, you can find a sample WSGI gateway based on BaseHTTPServer at:

http://cvs.eby-sarna.com/PEAK/src/peak/util/WSGIServer.py?rev=HEAD&content-type=text/vnd.viewcvs-markup

Although it's in the 'peak.util' package, it can be used as a standalone 
module without installing or using any portion of PEAK whatsoever.

This example should give a rough idea of the complexity of implementing 
WSGI in a web server that does not have CGI or a CGI-like internal 
interface already in existence.

Implementing a gateway over an existing CGI or CGI-like protocol (e.g. 
FastCGI, SCGI, etc.) is much simpler as it requires only ensuring that the 
file-like objects support the right methods and that 
'isinstance(environ,dict)', and that 'environ' may be safely modified by 
the called service.

In the most trivial case, this short snippet:

#!python
from someservice import myservice
import sys,os

aService = myservice(someparam="something")
aService.runCGI(sys.stdin,sys.stdout,sys.stderr,os.environ.copy())

is sufficient to run a WSGI service under CGI.