I'm using HttpURLConnection to do communication with a backend server and
im doing so in an async task in the doInBackground method as you should.
Now I need to be able to follow 302 redirects, but I'm having some problems
with this. The issue is that the new location usually will be on another
host, however when doing the redirect request it seem not to change the URL
to a new host hence I get a 404 error saying the specified path does not
exits.
Now I know I could set HtppURLConnection.setFollowRedirect but I need to
have more control over the redirects so they should not just be followed
blindly. The Redirect behavour should be controlled by the object who
called the asynctask (when an asynctask object is created you pass the
object who creates it in a parameter called _callback).
Heres's my current code:
protected HttpResponse doInBackground(String... req) {
HttpURLConnection urlConnection = null;
try {
urlConnection = (HttpURLConnection) this._url.openConnection();
urlConnection.setConnectTimeout( (int) this._timeout*1000);
String body = req[0];
// set headers / write information to output stream if request is post
// create the response object
HttpResponse responseObject = null;
try
{
// get status, contenttype, charset...
InputStream in = null;
if (urlConnection.getResponseCode() != -1 &&
urlConnection.getResponseCode() < 300)
{
in = new BufferedInputStream(urlConnection.getInputStream(), 8192);
}
else
{
in = new BufferedInputStream(urlConnection.getErrorStream(), 8192);
}
responseObject = new HttpResponse(in, status, contentType, charset);
// if redirect
if (status == 302 && this._callback.onRedirect(responseObject) == true)
{
// recall
String url = urlConnection.getHeaderField("location");
Log.v("Async Task", "Redirect location: " + url);
this._url = null;
this._url = new URL(url);
urlConnection.disconnect();
urlConnection = null;
responseObject = this.doInBackground(req);
}
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
// return the response
return responseObject;
}
// catch some other exceptions
finally
{
if (urlConnection != null)
{
urlConnection.disconnect();
} }
}
And as said the problem is that the redirect request seem to change the
path of the URL but not the host. The URL object itself seem to contain the
right information so I have no idea why this is happening. (I'm getting
HTML as response which is an 404 error page that includes the server name
of the old server)
Thanks for any help!
Note: HttpResponse is just an object I created for holding the relevant
information about the response.
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