code: def get_issuer(site_url=None, request=None):
      
      site_url = get_site_url(site_url=site_url, request=request)
      path = reverse('oidc_provider:provider-info') \
          .split('/.well-known/openid-configuration')[0]
      issuer = site_url + path
  
      return str(issuer)
docs: Construct the issuer full url. Basically is the site url with some path
      appended.