4.2.1 - 302 Redirect

[Gerd Schmidt <g....@gmx.de>]

Hi,

I want to get the body from a page, which is redirected from a https adress.

I'm using Version 4.2.1 and Eclipse Java EE IDE for Web Developers 
Version: Indigo Service Release 2

I read the tutorials and this is my code:

     public final static void main(String[] args) throws Exception {

         HttpClient httpclient = new DefaultHttpClient();

         try {

             HttpPost httpost = new HttpPost("https://xxx.xx");

             List <NameValuePair> nvps = new ArrayList <NameValuePair>();
             nvps.add(new BasicNameValuePair("login", "abc"));
             nvps.add(new BasicNameValuePair("password", "abc"));

             httpost.setEntity(new UrlEncodedFormEntity(nvps, 
Consts.UTF_8));

             HttpResponse response = httpclient.execute(httpost);

             HttpEntity entity = response.getEntity();
             System.out.println("Login form get: " + 
response.getStatusLine());
             EntityUtils.consume(entity);

         } finally {
             httpclient.getConnectionManager().shutdown();
         }
     }

It works, I get a "HTTP/1.1 302 Moved Temporarily", so I checked the 
HEADER for the redirectLocation.

             String redirectLocation = null;
             Header locationHeader = response.getFirstHeader("location");
             if (locationHeader != null) {
                 redirectLocation = locationHeader.getValue();
             }

This works too, I got the new adress. My Problem is, I want to get the 
body of the redirected location (while I'm logged in).
So i tried:

             HttpGet httpget = new HttpGet(redirectLocation);
             ResponseHandler<String> responseHandler = new 
BasicResponseHandler();
             String responseBody = httpclient.execute(httpget, 
responseHandler);
             System.out.println(responseBody);

But this is not the page, with the updated content i wanted. Furthermore 
I read, I have to set a "RedirectStrategy", so i tried
putting

((AbstractHttpClient) httpclient).setRedirectStrategy(new 
LaxRedirectStrategy());

after HttpClient httpclient = new DefaultHttpClient(); still no change.
(Anyway, why is httpclient.setRedirectStrategy(new 
LaxRedirectStrategy());  not working?)

So, my Question is, "How do i handle a 302 redirect an get the 
redirected body".

Thank you
Gerd Schmidt



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Re: 4.2.1 - 302 Redirect

[Oleg Kalnichevski <ol...@apache.org>]

On Mon, 2012-09-17 at 15:39 +0200, Gerd Schmidt wrote:
> Hi,
> 
> I want to get the body from a page, which is redirected from a https adress.
> 
> I'm using Version 4.2.1 and Eclipse Java EE IDE for Web Developers 
> Version: Indigo Service Release 2
> 
> I read the tutorials and this is my code:
> 
>      public final static void main(String[] args) throws Exception {
> 
>          HttpClient httpclient = new DefaultHttpClient();
> 
>          try {
> 
>              HttpPost httpost = new HttpPost("https://xxx.xx");
> 
>              List <NameValuePair> nvps = new ArrayList <NameValuePair>();
>              nvps.add(new BasicNameValuePair("login", "abc"));
>              nvps.add(new BasicNameValuePair("password", "abc"));
> 
>              httpost.setEntity(new UrlEncodedFormEntity(nvps, 
> Consts.UTF_8));
> 
>              HttpResponse response = httpclient.execute(httpost);
> 
>              HttpEntity entity = response.getEntity();
>              System.out.println("Login form get: " + 
> response.getStatusLine());
>              EntityUtils.consume(entity);
> 
>          } finally {
>              httpclient.getConnectionManager().shutdown();
>          }
>      }
> 
> It works, I get a "HTTP/1.1 302 Moved Temporarily", so I checked the 
> HEADER for the redirectLocation.
> 
>              String redirectLocation = null;
>              Header locationHeader = response.getFirstHeader("location");
>              if (locationHeader != null) {
>                  redirectLocation = locationHeader.getValue();
>              }
> 
> This works too, I got the new adress. My Problem is, I want to get the 
> body of the redirected location (while I'm logged in).
> So i tried:
> 
>              HttpGet httpget = new HttpGet(redirectLocation);
>              ResponseHandler<String> responseHandler = new 
> BasicResponseHandler();
>              String responseBody = httpclient.execute(httpget, 
> responseHandler);
>              System.out.println(responseBody);
> 
> But this is not the page, with the updated content i wanted. Furthermore 
> I read, I have to set a "RedirectStrategy", so i tried
> putting
> 
> ((AbstractHttpClient) httpclient).setRedirectStrategy(new 
> LaxRedirectStrategy());
> 
> after HttpClient httpclient = new DefaultHttpClient(); still no change.
> (Anyway, why is httpclient.setRedirectStrategy(new 
> LaxRedirectStrategy());  not working?)
> 
> So, my Question is, "How do i handle a 302 redirect an get the 
> redirected body".
> 
> Thank you
> Gerd Schmidt
> 

Gerd,

You basically have two options: either implement a custom
RedirectStrategy (LaxRedirectStrategy is not going to help here as it is
intended for a completely different case) or disable automatic redirects
and handle all redirect status codes manually.

Oleg



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