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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def metadata(request, config_loader_path=None, valid_for=None):
 """Returns an XML with the SAML 2.0 metadata for this SP as configured in the settings.py file. """

    conf = get_config(config_loader_path, request)
    metadata = entity_descriptor(conf)
    return HttpResponse(content=text_type(metadata).encode('utf-8'),
                        content_type="text/xml; charset=utf8")