Download lengthy data as a CSV file

Download lengthy data as a CSV file

I need to download the contents of a table shown in the view as a CSV
file. I have code to format the contents of the table properly so that it
can be stored as a .csv file (for example, the column separator is a
comma, each record of the table is in a new line).
So, in my controller, I have the following code:
window.location.href = '/download?data=' +
encodeURIComponent($scope.csvString);
I am using NodeJs for the server part. Here, I have the following route
handler:
app.get('/download', function (req, res) {
var data = req.query.data;
res.attachment('data.csv');
res.setHeader('Content-Type', 'text/csv');
res.end(data);
});
This works perfectly fine. The download works and the data in the file
downloaded is in perfect CSV format. No issues.
The issue arises when there are too many records in the table, that is
when the data is huge. Due to this, the query parameter is really huge and
I assume that it exceeds the limit and thus, the GET request returns with
a 400 (Bad Request) error - note that according to my analysis, the
request never reaches the server, instead I observed that the request
failed using the Chrome Developer Tools. In the browser, the URL simply is
www.my_domain.com/download?data=the_lengthy_data. That's it. The web page
is blank / empty and no file is downloaded.
Thus, I wish to know how I can download the lengthy data? All examples
that I came across do a GET request and thus I have to pass the lengthy
data as a query parameter. Is there some other approach?