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/usr/share/pyshared/flup/server/cgi.py is in python-flup 1.0.2-4.

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# Taken from <http://www.python.org/dev/peps/pep-0333/>
# which was placed in the public domain.

import os, sys


__all__ = ['WSGIServer']


class WSGIServer(object):

    def __init__(self, application):
        self.application = application

    def run(self):

        environ = dict(os.environ.items())
        environ['wsgi.input']        = sys.stdin
        environ['wsgi.errors']       = sys.stderr
        environ['wsgi.version']      = (1,0)
        environ['wsgi.multithread']  = False
        environ['wsgi.multiprocess'] = True
        environ['wsgi.run_once']     = True

        if environ.get('HTTPS','off') in ('on','1'):
            environ['wsgi.url_scheme'] = 'https'
        else:
            environ['wsgi.url_scheme'] = 'http'

        headers_set = []
        headers_sent = []

        def write(data):
            if not headers_set:
                 raise AssertionError("write() before start_response()")

            elif not headers_sent:
                 # Before the first output, send the stored headers
                 status, response_headers = headers_sent[:] = headers_set
                 sys.stdout.write('Status: %s\r\n' % status)
                 for header in response_headers:
                     sys.stdout.write('%s: %s\r\n' % header)
                 sys.stdout.write('\r\n')

            sys.stdout.write(data)
            sys.stdout.flush()

        def start_response(status,response_headers,exc_info=None):
            if exc_info:
                try:
                    if headers_sent:
                        # Re-raise original exception if headers sent
                        raise exc_info[0], exc_info[1], exc_info[2]
                finally:
                    exc_info = None     # avoid dangling circular ref
            elif headers_set:
                raise AssertionError("Headers already set!")

            headers_set[:] = [status,response_headers]
            return write

        result = self.application(environ, start_response)
        try:
            for data in result:
                if data:    # don't send headers until body appears
                    write(data)
            if not headers_sent:
                write('')   # send headers now if body was empty
        finally:
            if hasattr(result,'close'):
                result.close()