HTTP POST and RESPONSE specific case study

Question

Site: http://na.leagueoflegends.com/ladders/solo-5x5
Search for a a player (example: Jaiybe)
You get redirected (in this case to: http://na.leagueoflegends.com/ladders/solo-5x5?highlight=28&page=1)
Read the content

And I want to do that in java/android.

I analyze the sites POST request when searching, result:
- op:Search
- player:Jaiybe
- ladder_id:3
- form_build_id:form-fff5e6e2569f1e15e5a5caf2a61c15e2
- form_id:ladders_filter_form
Build a simple HTTP POST mixture and lets read the content...

The CODE:

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://na.leagueoflegends.com/ladders/solo-5x5");

// Add your POST METHOD attributes
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("op", "Search"));
nameValuePairs.add(new BasicNameValuePair("player", Jaiybe));
nameValuePairs.add(new BasicNameValuePair("ladder_id", "3"));
nameValuePairs.add(new BasicNameValuePair("form_build_id","form-daca6fff89cedc352ccc3f533afa3804"));
nameValuePairs.add(new BasicNameValuePair("form_id","ladders_filter_form"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
responseBody = EntityUtils.toString(response.getEntity());
return responseBody;

And when I run it - I get so some kind of a offline page...

The number form_build_id - is constantly changing, but this was no problem, to use still the same one, and also If I would like to "test" if this could be the problem, I have no Idea how would I...

OR: Is there any other - FAST - way how to get same results?

What is strange is that the "error" site source code that I get on android is different as if I run the same on my PC (Win7, Eclipse, Java) or in my browser. As if there would be two versions of offline sites - for mobile and for PC - but my question: HOW WOULD the server know that the code runs on a Android device? Is there a way how to set this up in HttpClient?

Is this a site you wrote, or are you trying to parse someone else's site? Just curious. If you have control of the site code then there are much easier ways. — Mike Marshall, Nov 03 '11 at 16:08
http://stackoverflow.com/questions/3658721/httpclient-4-error-302-how-to-redirect — Oliver Goossens, Nov 04 '11 at 12:48
More here: http://stackoverflow.com/questions/8014997/android-httppost-redirect-location-or-body-of-response-needed-works-in — Oliver Goossens, Nov 04 '11 at 19:57

score 1 · Accepted Answer · answered Nov 03 '11 at 16:18

1

form_build_id:form-fff5e6e2569f1e15e5a5caf2a61c15e2

This is an auto generated token that is valid for a certain time period. This is probably the source of your problem and the reason the token exists in the first place (to prevent post spams).

As this token does not seem session based, you could actually use an HTTP Get on the page that generates the form and parse out the generated token each time for your HTTP Post.

About OS detection, browsers usually provide information about the OS using the HTTP User-Agent header.

answered Nov 03 '11 at 16:18

Che Jami

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Well that may be, is there a way about this tokens? – Oliver Goossens Nov 03 '11 at 16:23
As I already mentioned, you need to parse out the token from http://na.leagueoflegends.com/ladders/solo-5x5 each time. However, I would advise you to contact Riot to find out their stance on this. – Che Jami Nov 03 '11 at 17:25
I use in java (Eclipse PC) the same token all the time and it works. Dont think this will be the issue. – Oliver Goossens Nov 04 '11 at 19:57

HTTP POST and RESPONSE specific case study

1 Answers1