def handle_connection(self, conn):
        """
        Handle an individual connection.
        """
        input = conn.makefile("r")
        output = conn.makefile("w")

        environ = self.read_env(input)
        environ['wsgi.input']        = input
        environ['wsgi.errors']       = sys.stderr
        environ['wsgi.version']      = (1, 0)
        environ['wsgi.multithread']  = False
        environ['wsgi.multiprocess'] = True
        environ['wsgi.run_once']     = False

        # dunno how SCGI does HTTPS signalling; can't test it myself... @CTB
        if environ.get('HTTPS','off') in ('on','1'):
            environ['wsgi.url_scheme'] = 'https'
        else:
            environ['wsgi.url_scheme'] = 'http'

        ## SCGI does some weird environ manglement.  We need to set
        ## SCRIPT_NAME from 'prefix' and then set PATH_INFO from
        ## REQUEST_URI.

        prefix = self.prefix
        path = environ['REQUEST_URI'][len(prefix):].split('?', 1)[0]

        environ['SCRIPT_NAME'] = prefix
        environ['PATH_INFO'] = path

        headers_set = []
        headers_sent = []
        chunks = []
        def write(data):
            chunks.append(data)

        def start_response(status, response_headers, exc_info=None):
            if exc_info:
                try:
                    if headers_sent:
                        # Re-raise original exception if headers sent
                        six.reraise(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.app_obj(environ, start_response)
        try:
            for data in result:
                chunks.append(data)

            # Before the first output, send the stored headers
            if not headers_set:
                # Error -- the app never called start_response
                status = '500 Server Error'
                response_headers = [('Content-type', 'text/html')]
                chunks = ["XXX start_response never called"]
            else:
                status, response_headers = headers_sent[:] = headers_set

            output.write('Status: %s\r\n' % status)
            for header in response_headers:
                output.write('%s: %s\r\n' % header)
            output.write('\r\n')

            for data in chunks:
                output.write(data)
        finally:
            if hasattr(result,'close'):
                result.close()

        # SCGI backends use connection closing to signal 'fini'.
        try:
            input.close()
            output.close()
            conn.close()
        except __HOLE__ as err:
            debug("IOError while closing connection ignored: %s" % err)
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Paste-2.0.1/paste/util/scgiserver.py/SWAP.handle_connection