It's not possible to send a large XLS file using a stream writter

Hello!

I’m trying to send a large XLS document using WorkbookWriter over HTTP.

Expected: Receiving file, chunk by chunk. File should be OK.

Actual: Chrome shows “Starting - 0 B/s - 0 B” about a minute, then I get “Failed - Network error”.

Info: It works good with small data amount.

Please, check the code sample below.

'use strict';

const Excel = require('exceljs');
const http = require('http');
const async = require('async');

http.createServer((request, response) => {

    let workbook = new Excel.stream.xlsx.WorkbookWriter({
        stream: response
    });

    let worksheet = workbook.addWorksheet('work-sheet');

    worksheet.columns = [{header: 'field', key: 'field'}];

    response.writeHead(200, {
        'Content-Disposition': `attachment; filename="export.xlsx"`,
        'Transfer-Encoding': 'chunked',
        'Content-Type': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
    });

    let count = 0;

    async.whilst(() => {

        return count < 1000;

    }, callback => {

        count++;

        console.log(`Write row ${count}`);

        worksheet.addRow({field: 'test'}).commit();

        setTimeout(() => {
            callback(null, count);
        }, 1000);

    }, (err, n) => {

        workbook.commit().then(() => {

            console.log('done');
        });
    });

}).listen(2000);

[bushev]

Hi guys! My workaround (using a temporary file) here: https://github.com/bushev/node-lib/blob/master/lib/controllers/crudcontroller.js#L1354

[hsb0818]

Did you guys figure this out? In my case as well, download does not begin and only after the file is fully generated the download happens in an instant. So it is almost like the streaming interface does not stream 😉

I do have commit() sprinkled on every possible place as well.

is this issue solved? my program work like this…