How to send file name with NanoHttpd Response - http-headers

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;
}