def METHOD_NAME(self):
    @Request.application
    def app(request):
        return Response('%s|%s' % (
            request.remote_addr,
            # do not use request.host as this fixes too :)
            request.environ['HTTP_HOST']
        ))
    app = fixers.ProxyFix(app, num_proxies=2)
    environ = dict(create_environ(),
        HTTP_X_FORWARDED_PROTO="https",
        HTTP_X_FORWARDED_HOST='example.com',
        HTTP_X_FORWARDED_FOR='1.2.3.4, 5.6.7.8',
        REMOTE_ADDR='127.0.0.1',
        HTTP_HOST='fake'
    )
    response = Response.from_app(app, environ)
    self.assert_equal(response.get_data(), b'1.2.3.4|example.com')
    # And we must check that if it is a redirection it is
    # correctly done:
    redirect_app = redirect('/foo/bar.hml')
    response = Response.from_app(redirect_app, environ)
    wsgi_headers = response.get_wsgi_headers(environ)
    assert wsgi_headers['Location'] == 'https://example.com/foo/bar.hml'