$options = [
        'max_conn_per_addr' => 128, // 每個(gè)地址最多維持多少并發(fā)連接
        'keepalive_timeout' => 15,  // 連接多長(zhǎng)時(shí)間不通訊就關(guān)閉
        'connect_timeout'   => 30,  // 連接超時(shí)時(shí)間
        'timeout'           => 30,  // 等待響應(yīng)的超時(shí)時(shí)間
    ];