Agfdhyk

I have a very simple node.js app which successfully processes a file (from formidable form) but the download of the result file fails. The download html

<p><input type="text" value = "tx-AllSerums.xlsx"><br>
<a href="/transformed/tx-AllSerums.xlsx"
download="All Serums.xlsx">Download transformed file</a>
</p>

The result files are written to the directory structure from where I run node (the 'transformed' dir is in the dir in which I run node).
When I click on the above href I get console output but no file save dialog. (Should the server even get this event?)
When I kill the node server, up pops the file save dialog. Of course the save fails: Network error.
I'm currently running everything on my workstation: Ubuntu 18.04; Chrome 70.0.3538.77, node v10.13.0

I've found that the file save dialog does appear but a very long time after the click. But the server is still up and the save operation still fails: Network error.

Adding res.end() to the block catching the download click gets the dialog up immediately. Now I successfully download a zero length file. Oddly I find that encouraging.

var formidable = require('formidable');

var util = require("util");

var http = require('http');

var url = require('url');

var fs = require('fs');

var java = require("java");

var proc = require("process");



java.classpath.push("/home/u0138544/fake/prep-1.jar");

java.classpath.push("/home/u0138544/fake/SRTDependancies-1.jar");

console.log(proc.cwd());

http.createServer(function (req, res) {

    txName = "";

    if (req.url == '/fileupload' && req.method.toLowerCase() == 'post') {

        var form = formidable.IncomingForm();

        form.keepExtensions = true;

        var excelFilePath;

        var origName;

        form.parse(req , function (err, fields, files) {

            excelFilePath = files.filetoupload.path;

            console.log("upload " + excelFilePath);

            origName = files.filetoupload.name;

            txName = "tx-" + origName.replace(/s/g, "");

            console.log( "txname = " + txName);

            //just for formatter

            var clz = "edu.utah.camplab.xlsx.SampleReportTransformer";

            var tx = java.newInstanceSync(clz);

            java.callMethodSync(tx, "run", excelFilePath, "./transformed/" + txName);

            res.writeHead(200, {'Content-Type': 'text/html'});

            res.write('<p>');

            res.write('<input type="text" value = "' + txName +'"><br>');

            res.write('<a href="transformed/' + txName + '" download="' + origName +'">Download transformed file</a></p>');

            return res.end();

        });

    }

    else if (req.url.includes('transformed') && 

        req.method.toLowerCase() == 'get') {

        console.log("download attribute doesn't work")

        res.end();

    }

    else {

        res.writeHead(200, {'Content-Type': 'text/html'});

        res.write('<form action="fileupload" method="post" enctype="multipart/form-data">');

        res.write('<input type="file" name="filetoupload" label="Pick a file"><br>');

        res.write('<input type="submit">');

        res.write('</form>');

        return res.end();

    }

}).listen(15080);