title: Why am I getting a 400 response code?
body: <p>I am trying to get some acquaintance in using facebook API using Java (restfb). I am trying out the following code.</p>
  
  <pre><code>public class FBJava {
  
      private String API_Key = "xxxxxx";
      private String API_Secret = "xxxxxxxx";
  
      public String firstReq = "https://graph.facebook.com/oauth/authorize?client_id="+API_Key+"&amp;" +
              "redirect_uri=http://www.facebook.com/connect/login_success.html&amp; scope=publish_stream,offline_access,create_event";
      public String secondReq = "https://graph.facebook.com/oauth/access_token?client_id="+API_Key+"" +
              "&amp;redirect_uri=http://www.facebook.com/connect/login_success.html&amp;client_secret="+API_Secret+"&amp;code=";
  
  
      public static void main(String[] args) throws IOException {
          FBJava fb = new FBJava();
  
          System.out.println(fb.firstReq);
          URL request = new URL(fb.firstReq);
  
          HttpURLConnection conn = (HttpURLConnection) request.openConnection();
          conn.connect();
  
          int code = conn.getResponseCode();
          System.out.println(code);
  
      }
  }
  </code></pre>
  
  <p>When I run the firstReq string in the browser manually, it is redirecting me to the correct page. But when I check the response code I am getting a 400 which means that its a bad request. I want to know why does it respond differently when I try to run it through the program. I know I am doing something wrong, but want to know what is the mistake and why is it occurring? Any kind of insight in this matter would be appreciated.</p>