How to use the micawber.bootstrap_basic function in micawber

instance.image_url = instance.image.url
      	instance.file_name = os.path.basename(str(instance.image_url))
      	if not instance.name:
            instance.name = instance.file_name

        instance.thumbnail_image = instance.image

    if instance.thumbnail_image:
        instance.thumbnail_image_url = instance.thumbnail_image.url

    instance.save()

    if instance.video_url:
        try:
            import micawber
            providers = micawber.bootstrap_basic()
            oembed = providers.request(instance.video_url)
            if "html" in oembed:
                instance.video_embed = oembed["html"]

                if not instance.thumbnail_image:
                    if "thumbnail_url" in oembed:
                        instance.thumbnail_image_url = oembed["thumbnail_url"]
                    if "thumbnail_width" in oembed:
                        instance.thumbnail_image_height = oembed["thumbnail_width"]
                    if "thumbnail_height" in oembed:
                        instance.thumbnail_image_height = oembed["thumbnail_height"]
                
        except Exception as e:
            print traceback.format_exc()

    #Process images and thumbnails

def save(self, *args, **kwargs):
        providers = micawber.bootstrap_basic()
        try:
            self.embed = providers.request(self.link)['html']
        except micawber.ProviderException,e:
            self.embed = None
        super(Link,self).save(*args, **kwargs)

def _build_provider_list():
    """
    Construct the provider registry, using the app settings.
    """
    registry = None
    if appsettings.FLUENT_OEMBED_SOURCE == "basic":
        registry = bootstrap_basic()
    elif appsettings.FLUENT_OEMBED_SOURCE == "embedly":
        params = {}
        if appsettings.MICAWBER_EMBEDLY_KEY:
            params["key"] = appsettings.MICAWBER_EMBEDLY_KEY
        registry = bootstrap_embedly(**params)
    elif appsettings.FLUENT_OEMBED_SOURCE == "noembed":
        registry = bootstrap_noembed(nowrap=1)
    elif appsettings.FLUENT_OEMBED_SOURCE == "list":
        # Fill list manually in the settings, e.g. to have a fixed set of supported secure providers.
        registry = ProviderRegistry()
        for regex, provider in appsettings.FLUENT_OEMBED_PROVIDER_LIST:
            registry.register(regex, Provider(provider))
    else:
        raise ImproperlyConfigured(
            "Invalid value of FLUENT_OEMBED_SOURCE, only 'basic', 'list', 'noembed' or 'embedly' is supported."
        )

def bootstrap(cache=None):
    # micawbers own bootstrap basic plus some more
    pr = bootstrap_basic(cache=cache)
    # add https support for vimeo and youtube
    pr.register('https://vimeo.com/\S*', Provider('https://vimeo.com/api/oembed.json'))
    try:
        pr.unregister('https?://(\S*.)?youtu(\.be/|be\.com/watch)\S+')
    except KeyError:  # if not registered
        pass
    pr.register('https?://(\S*.)?youtu(\.be/|be\.com/watch)\S+', Provider('https://www.youtube.com/oembed?scheme=https'))
    return pr