How to send file name with NanoHttpd Response

Question

I've successfully achieved file transfer over local network using NanoHttpd. However, I'm unable to send the file name in NanoHttpd Response. The received files have a default name like this: localhost_8080. I tried to attach file name in response header using Content-disposition, but my file transfer failed all together. What am I doing wrong? Here is my implementation:

private class WebServer extends NanoHTTPD {
    String MIME_TYPE;
    File file;

    public WebServer() {
        super(PORT);
    }

    @Override
    public Response serve(String uri, Method method,
            Map<String, String> header, Map<String, String> parameters,
            Map<String, String> files) {
        try {
            file=new File(fileToStream);
            fis = new FileInputStream(file);
            bis = new BufferedInputStream(fis);
            MIME_TYPE= URLConnection.guessContentTypeFromName(file.getName());
        } catch (IOException ioe) {
            Log.w("Httpd", ioe.toString());
        }
        NanoHTTPD.Response res=new NanoHTTPD.Response(Status.OK, MIME_TYPE, bis);
        res.addHeader("Content-Disposition: attachment; filename=", file.getName());
        return res;
    }
}

Thanks for your help!

Answer 1

You need to specify the response, the MIME type, and the stream of bytes to be sent. After that you just add a header with the file name of the file since its a http method. Here is a sample code that solves the problem

@Override
public Response serve(String uri, Method method,
    Map<String, String> header, Map<String, String> parameters,
    Map<String, String> files) {

    FileInputStream fis = null;
    try {
        fis = new FileInputStream(fileName);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    NanoHTTPD.Response res = new NanoHTTPD.Response(Response.Status.OK, "application/vnd.android.package-archive", fis);
    res.addHeader("Content-Disposition", "attachment; filename=\""+fileName+"\""); 
    return res;

}