e': 'application/json'
                },
                body: JSON.stringify({
                    id: assertion.id,
                    rawId: base64UrlEncode(assertion.rawId),
                    type: assertion.type,
                    response: {
                        authenticatorData: base64UrlEncode(assertion.response.authenticatorData),
                        clientDataJSON: base64UrlEncode(assertion.response.clientDataJSON),
                        signature: base64UrlEncode(assertion.respons