如何在node-red中下载tar文件？

编程问答 2022-06-09

问题描述

我正在尝试以节点红色下载tar文件。

以下是我下载文件的JavaScript代码。

downloadTar(sendobj).then(res => {
        var bytes = new Uint8Array(byte); // pass your byte response to this constructor
        var blob = new Blob([bytes],{type: "application/tar"});
        var link = document.createElement('a');
        link.href = window.URL.createObjectURL(blob);
        var fileName = 'genome.tar';
        link.download = fileName;
        link.click();
});


function downloadTar(data) {
    return new Promise((resolve,reject) => {
        $.ajax({
            url: nodeRedDownloadTar,type: 'POST',data: data,success: function (result) {
                resolve(result);
            }
        });
    });
}

以下是我的红色节点流程，我正在读取a single Buffer Object中的文件并将其发送到http响应

enter image description here

然后是我从后端得到的响应。

enter image description here

问题是tar文件未下载。我不确定在哪里出问题。

解决方法

以下流程正常工作，我在http-response节点中使用headers选项将content-type设置为appplication/x-tar 

[
    {
        "id": "6e993a09.f44244","type": "file in","z": "1c834717.22be01","name": "","filename": "/home/pi/test.tar","format": "","chunk": false,"sendError": false,"encoding": "none","x": 600,"y": 580,"wires": [
            [
                "6e7d5f6f.c9477"
            ]
        ]
    },{
        "id": "df49df3b.d325b","type": "http in","url": "/tar","method": "post","upload": false,"swaggerDoc": "","x": 380,"wires": [
            [
                "6e993a09.f44244"
            ]
        ]
    },{
        "id": "6e7d5f6f.c9477","type": "http response","statusCode": "","headers": {
            "content-type": "application/x-tar"
        },"x": 800,"wires": []
    }
]
javascriptjquerynode-red