Unable to download files from cordova app - android

I am facing an issue with trying to download a file from the server in the cordova android app...In the cordova app we are using the inappbrowser to open a web application in html and JS. When we try to do window.open("url","_blank") we are unable to get the file to be downloaded.
From the server we are getting
Content-Disposition: attachment; filename="filename.jpg"
Still i am unable to get the files to get downloaded
Response headers have the content disposition set and the response seems to be empty with a content type text/file
One concern for us is that the cookies need to be sent alongside with the request and is set by the server after authentication, hence we cannot use the external browser (using _system)
Thanks

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Upgradeapk_controller.rb file
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#filename = '/myApk/myApk.apk'
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----EDIT------
Ok so i've decided to store the files in a dropbox location instead of storing it in my server. If i pass the url for the file directly in my android function for the http request, it works well. The file is found, downloaded and the installation is prompted.
class UpgradeapkController < ApplicationController
def index
android_apk = Androidaplicacion.first (Model to access the table in which i store the apk dropbox url)
route = android_apk.url
redirect_to route
end
end
I've set up my controller to redirect to the given url for the dropbox file. If i try the url (same as before, using the "match" url) in my android browser, this time it downloads. However, if I try it from the android app, its the same as before, it just doesnt download.
So, the "send_file" method seems to not be working if its on the android platform. redirecting to my dropbox url from the controller works on android but only from a browser, not using the http request on my android app. The only way to get it to work in my android app is if I use the dropbox direct link.
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Avoiding content type issues when downloading a file via browser on Android

If I have a file made available to a browser through my webapp, I normally just set the URL to something like http://website.com/webapp/download/89347/image.jpg. I then set the HTTP headers Content-Type: application/octet-stream; filename=image.jpg and Content-Disposition: Attachment.
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http://digiblog.de/2011/04/19/android-and-the-download-file-headers/
Dmitriy (or others looking for a possible solution) if an html page is appearing in your downloaded file, I suspect this is due to the double HttpRequest GET issue. A typical scenario is the following POST, Redirect, GET model:
Android browser issues a HttpRequest POST to server (e.g. submit button or link to request a download file, filename.ext say)
Server streams the requested filename.ext to bytes, stores in a session variable, and then issues a Response.Redirect to Download.aspx, for example, to handle the response object construction
Android browser correctly sends HttpRequest GET to server for Download.aspx
Server responds with typical Content-Disposition: attachment; filename="filename.ext" style construct with the response object containing the requested filename.ext, being the bytes in the session variable.
Android download manager, I believe, then sends another HttpRequest GET to server for Download.aspx. I suspect that the download manager interprets the previous "attachment" response as a trigger to send this second GET.
Server (Download.aspx) again tries to construct the response object to send back to the browser.
Android download manager downloads filename.ext, using the response object contents from the second Download.aspx.
In many scenarios this would be fine. But if, for example, the server in the Download.aspx code does some housekeeping and removes the session variable the first time it is called, then the next time around there is no session variable. So, depending on how the code is written it is possible that the response object doesn't get explicity constructed and maybe the Response.End doesn't get called and so only the Download.aspx's html ends up being sent.
This is what we discovered using Wireshark, although I admit I am assuming it is the Android download manager that is the cause for the double GET.
I hope this explanation has been of some help.
As I wrote at downloading files from android:
Android browser will not download file in button Post events. In post events the file will be some .htm garbage file. to over come this do as below.
In download button click
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
Response.Redirect("download-file.aspx");
}
and on download-file.aspx file do as below
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class mobile_download_file : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string filename = "usermanual.pdf";
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + "" + filename + "");
Response.Write(Server.MapPath(Request.ApplicationPath) + "\\" + filename);
Response.TransmitFile(Server.MapPath(Request.ApplicationPath) + "\\" + filename);
Response.End();
}
}
the same can be implemented in php also.
I have tried all recommendations from Jspy blog and nothing worked so far. Content-disposition brings browser in downloading mode, however nothing gets downloaded except HTML of page from which download got initiated. So my conclusion, it is pure bug from Google and we may only pray for that Google fix it. My work around was to set content type to some type coming from Accept header form mobile browser. It generally works, you can even download zip files as text.
In theory, the filename parameter should be set on Content-Disposition, not Content-Type. Not sure whether this will help with the Android browser.

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