src/LightSaml/Binding/BindingFactory.php
protected function processGET(Request $request)
    {
        $get = $request->query->all();
        if (array_key_exists('SAMLRequest', $get) || array_key_exists('SAMLResponse', $get)) {
            return SamlConstants::BINDING_SAML2_HTTP_REDIRECT;
        } elseif (array_key_exists('SAMLart', $get)) {
            return SamlConstants::BINDING_SAML2_HTTP_ARTIFACT;
        }

        return null;
    }
protected function processGET(Request $request)
    {
        $get = $request->query->all();
        if (array_key_exists('SAMLRequest', $get) || array_key_exists('SAMLResponse', $get)) {
            return SamlConstants::BINDING_SAML2_HTTP_REDIRECT;
        } elseif (array_key_exists('SAMLart', $get)) {
            return SamlConstants::BINDING_SAML2_HTTP_ARTIFACT;
        }

        return null;
    }
@param Request $request

@return null|string