Triggering a file download without any server request

Question

Greetings,

I\'m working on a JS-based application that does some complex work and logs some information (actually, up to hundreds of lines) on a

Answer 1

This solution is slightly convoluted but would work for your needs, perhaps it's an option.

Create a custom web server that simply returns the contents of any GET or POST as text/plain.

Host that web server on the same box as the web application but running on a different port. When you click the Save log button, the request is sent to the custom server and the text file is returned.

Here's a proof of concept server in Java that will do just that:

// After running this program, access with your browser at 127.0.0.1:8080

import java.net.*;
import java.io.*;

public class ReturnTextFile
{

    public static void main(String[] args)
    {

    try
    {
        ServerSocket server = new ServerSocket(8080);
        Socket connection = null;

        while (true)
        {

        try
        {
            connection = server.accept();

            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));

            String input = in.readLine();

            // TODO: Clean up input

            Writer out = new OutputStreamWriter(connection.getOutputStream());

            String output = "HTTP/1.1 200 OK\n" +
                    "Connection: close\n" +
                    "Content-Disposition: attachment; filename=log.txt\n" +
                    "Content-Type: text/plain; charset=utf-8\n" +
                    "\n";

            output += input;

            out.write(output);

            out.flush();

            connection.close();
        }
        catch (IOException ex)
        {
            ex.printStackTrace();
        }
        finally
        {
            if (connection != null)
            {
            connection.close();
            }
        }

        }

    }
    catch (IOException ex)
    {
        ex.printStackTrace();
    }

    }
}