I want to deploy a website in english & spanish and detect the user browser languaje & redirect to the correct locale site.

My site is www.elmalabarista.com

I install django-localeurl, but I discover that the languaje is not correctly detected.

This are my middlewares:

MIDDLEWARE_CLASSES = (
    'django.contrib.sessions.middleware.SessionMiddleware',	
    'django.middleware.locale.LocaleMiddleware',	
    'multilingual.middleware.DefaultLanguageMiddleware',
    'middleware.feedburner.FeedburnerMiddleware',
    'lib.threadlocals.ThreadLocalsMiddleware',
    'middleware.url.UrlMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'maintenancemode.middleware.MaintenanceModeMiddleware',
    'middleware.redirect.RedirectMiddleware',
    'openidconsumer.middleware.OpenIDMiddleware',
    'django.middleware.doc.XViewMiddleware',
    'middleware.ajax_errors.AjaxMiddleware',
    'pingback.middleware.PingbackMiddleware',
    'localeurl.middleware.LocaleURLMiddleware',	
    'multilingual.flatpages.middleware.FlatpageFallbackMiddleware',
    'django.middleware.common.CommonMiddleware',
)

But ALWAYS the site get to US despite the fact my OS & Browser setup is spanish.

LANGUAGES = (
    ('en', ugettext('English')),  
    ('es', ugettext('Spanish')),
)
DEFAULT_LANGUAGE = 1

Then, I hack the middleware of locale-url and do this:

def process_request(self, request):
    locale, path = self.split_locale_from_request(request)
    if request.META.has_key('HTTP_ACCEPT_LANGUAGE'):
        locale = utils.supported_language(request.META['HTTP_ACCEPT_LANGUAGE'].split(',')[0])
    locale_path = utils.locale_path(path, locale)

    if locale_path != request.path_info:
        if request.META.get("QUERY_STRING", ""):
            locale_path = "%s?%s" % (locale_path,
                    request.META['QUERY_STRING'])
        return HttpResponseRedirect(locale_path)
    request.path_info = path
    if not locale:
        locale = settings.LANGUAGE_CODE
    translation.activate(locale)
    request.LANGUAGE_CODE = translation.get_language()

However, this detect fine the language but redirect the "en" urls to "es". So is impossible navigate in english.

UPDATE: This is the final code (after the input from Carl Meyer) with a fix for the case of "/":

def process_request(self, request):
    locale, path = self.split_locale_from_request(request)
    if (not locale) or (locale==''):
        if request.META.has_key('HTTP_ACCEPT_LANGUAGE'):
            locale = utils.supported_language(request.META['HTTP_ACCEPT_LANGUAGE'].split(',')[0])
        else:
            locale = settings.LANGUAGE_CODE
    locale_path = utils.locale_path(path, locale)
    if locale_path != request.path_info:
        if request.META.get("QUERY_STRING", ""):
            locale_path = "%s?%s" % (locale_path, request.META['QUERY_STRING'])
        return HttpResponseRedirect(locale_path)
    request.path_info = path
    translation.activate(locale)
    request.LANGUAGE_CODE = translation.get_language()