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我同时使用tus-node-server和tus-js-client来尝试从 Web 浏览器将文件上传到我的服务器。在较小的文件（10mb-ish）上，它似乎工作正常，但在较大的文件（385mb-ish）上，它似乎因失败而Access-Control-Allow-Origin失败。

上传进度被调用并一直完成，直到 100% 然后失败并出现错误。这让我认为该错误与某种类型的验证有关。

在控制台中抛出该错误后，它会重试直到我设置的重试限制。

我已经发布了下面的错误。为什么会发生这种情况？

[Error] Origin https://example.com is not allowed by Access-Control-Allow-Origin.
[Error] XMLHttpRequest cannot load https://upload.example.com//saiudfhia1h due to access control checks.
[Error] Failed to load resource: Origin https://example.com is not allowed by Access-Control-Allow-Origin.

此外，在尝试了所有重试后，它会因此错误而失败。

tus: failed to upload chunk at offset 0, caused by [object XMLHttpRequestProgressEvent], originated from request (response code: 0, response text: )

前端 JS：

var upload = new tus.Upload(file, {
    endpoint: "https://upload.example.com/?id=" + res._id,
    retryDelays: [0, 1000, 3000, 5000],
    metadata: {
        filename: res._id,
        filetype: file.type
    },
    onError: function(error) {
        console.log("Failed because: " + error)
    },
    onProgress: function(bytesUploaded, bytesTotal) {
        console.log(bytesUploaded, bytesTotal, percentage + "%")
    },
    onSuccess: function() {
        console.log("Download %s from %s", upload.file.name, upload.url)

        alert("You have successfully uploaded your file");
    }
})

// Start the upload
upload.start()

后端 JS：

server.datastore = new tus.FileStore({
    directory: '/files',
    path: '/',
    namingFunction: fileNameFromUrl
});

server.on(EVENTS.EVENT_UPLOAD_COMPLETE, (event) => {
    console.log(`Upload complete for file ${event.file.id}`);

    let params = {
        Bucket: keys.awsBucketName,
        Body: fs.createReadStream(path.join("/files", event.file.id)),
        Key: `${event.file.id}/rawfile`
    };
    s3.upload(params, function(err, data) {
        console.log(err, data);
        fs.unlink(path.join("/files", event.file.id), (err) => {
            if (err) throw err;
            console.log('successfully deleted file');
        });
    });
});

const app = express();
const uploadApp = express();
uploadApp.all('*', server.handle.bind(server));
app.use('/', uploadApp);
app.listen(3000);
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1 回答 1

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问题原来是服务器位于 CloudFlare 后面，每个上传请求都有大小限制。将 tus 客户端设置为将上传分块为多个请求解决了该问题。

chunkSize您可以在 tus-js-client 中设置一个属性。这可能因客户而异。此属性的默认值为Infinity。

var upload = new tus.Upload(file, {
    endpoint: "https://upload.example.com/?id=" + res._id,
    retryDelays: [0, 1000, 3000, 5000],
    chunkSize: x, // Change `x` to the number representing the chunkSize you want
    metadata: {
        filename: res._id,
        filetype: file.type
    },
    onError: function(error) {
        console.log("Failed because: " + error)
    },
    onProgress: function(bytesUploaded, bytesTotal) {
        console.log(bytesUploaded, bytesTotal, percentage + "%")
    },
    onSuccess: function() {
        console.log("Download %s from %s", upload.file.name, upload.url)

        alert("You have successfully uploaded your file");
    }
})
于 2018-07-03T15:35:21.450 回答