code: protected String getBinding(ProfileRequestContext<?, ?> context) {
      SAMLBindingContext samlBinding = this.samlBindingContextLookupStrategy.apply(context);
      return samlBinding != null ? samlBinding.getBindingUri() : null;
    }
docs: Utility method that may be used to obtain the binding that was used to pass the AuthnRequest message.
  
  @param context
  the profile context
  @return the binding URI
  @see #getBinding(HttpServletRequest)