public function sendCalendar($externalCoverageId, $location)
    {
        $client  = $this->httpClient;

        $request = $client->post(
            [self::ENTRY_POINT.'/{coverage}/'.self::EXPORT_API, ['coverage' => $externalCoverageId]],
            ['Content-Type => multipart/form-data'],
            null,
            ['exceptions' => false]
        );

        $request->addPostFile('file', $location);

        return $client->send($request);
    }