Follows redirection when posting

src/altk/comm/engine/postback/PostBack.java

@@ -18,7 +18,9 @@ import javax.xml.xpath.XPathFactory;
 
 import org.apache.commons.httpclient.ConnectTimeoutException;
 import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
+import org.apache.commons.httpclient.Header;
 import org.apache.commons.httpclient.HttpClient;
+import org.apache.commons.httpclient.HttpURL;
 import org.apache.commons.httpclient.methods.PostMethod;
 import org.apache.commons.httpclient.methods.StringRequestEntity;
 import org.apache.commons.httpclient.params.HttpMethodParams;
@@ -169,53 +171,91 @@ public class PostBack
             }
             xml.append("</"); xml.append(xmlTopElement); xml.append(">");
             
-            CommonLogger.activity.info(getName() + ": posting " + xml.toString());
-            PostMethod post = new PostMethod(postBackURL);
+            PostMethod post = new PostMethod();
             String responseBody = null;
+            StringRequestEntity requestEntity = null;
             try
             {
-                post.setRequestEntity(new StringRequestEntity(xml.toString(),
-                        "application/xml", "utf-8"));
+                requestEntity = new StringRequestEntity(xml.toString(), "application/xml", "utf-8");
             }
             catch (UnsupportedEncodingException e)
             {
                 CommonLogger.alarm.warn(getName() + ": While adding this application/xml content to PostBack: " + xml + " -- " + e);
                 return PostBackStatus.IRRECOVERABLE_ERROR;
             }
+            post.setRequestEntity(requestEntity);
             post.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
                 new DefaultHttpMethodRetryHandler(3, false));
-
+            /*
+            CommonLogger.activity.debug("Before calling setFolloweRedirects()");
+            post.setFollowRedirects(false);
+            CommonLogger.activity.debug("After calling setFolloweRedirects()");
+            */
             HttpClient client = new HttpClient();
-            try
+            String url = postBackURL;
+            for (int redirectCount = 0; redirectCount < 3; redirectCount++)
             {
-                client.getHttpConnectionManager().getParams().setConnectionTimeout(5 * 1000);
-                int statusCode = client.executeMethod(post);
-
-                if (statusCode != 200)
+                try
+                {
+                    client.getHttpConnectionManager().getParams().setConnectionTimeout(5 * 1000);
+                    post.setURI(new HttpURL(url));
+                    if (redirectCount == 0)
+                    {
+                        CommonLogger.activity.info(getName() + ": posting " + xml.toString() + " to " + url);
+                    }
+                    else
+                    {
+                        CommonLogger.activity.info(getName() + ": redirected to " + url);
+                    }
+                    int statusCode = client.executeMethod(post);
+    
+                    if (statusCode == 302)
+                    {
+                        Header locationHeader = post.getResponseHeader("Location");
+                        if (locationHeader != null)
+                        {
+                            url = locationHeader.getValue();
+                            post.releaseConnection();
+                            continue;
+                        }
+                        else
+                        {
+                            CommonLogger.alarm.warn(getName() + ": When posting to \"" + url + "\": " + " received status 302 but without location header");
+                            return PostBackStatus.IRRECOVERABLE_ERROR;
+                        }
+                    }
+                    else if (statusCode != 200)
+                    {
+                        CommonLogger.alarm.warn(getName() + ": Received problem status code " + statusCode + " from posting to \"" + url + "\": " + xml);
+                        return PostBackStatus.HTTP_STATUS_ERROR;
+                    }
+                    responseBody = post.getResponseBodyAsString().trim();
+                    post.releaseConnection();
+                    CommonLogger.activity.info(getName() + ": Received response: " + (responseBody.length() == 0? "[empty]" : responseBody));
+                    if (responseBody.trim().length() == 0) return PostBackStatus.SUCCESS;
+                    break;
+                }
+                catch (ConnectTimeoutException e)
                 {
-                    CommonLogger.alarm.warn(getName() + ": Received problem status code " + statusCode + " from posting to \"" + postBackURL + "\": " + xml);
-                    return PostBackStatus.HTTP_STATUS_ERROR;
+                    CommonLogger.alarm.warn(getName() + ": IO problem while posting to \"" + url + "\": " + xml + " -- " + e.getMessage());
+                    return PostBackStatus.SERVER_IO_ERROR;                
+                }
+                catch (IOException e)
+                {
+                    CommonLogger.alarm.warn(getName() + ": IO problem while posting to \"" + url + "\": " + xml + " -- " + e.getMessage());
+                    return PostBackStatus.SERVER_IO_ERROR;
+                }
+                catch (IllegalArgumentException e)
+                {
+                    CommonLogger.alarm.warn(getName() + ": When posting to \"" + url + "\": " + e.getMessage());
+                    return PostBackStatus.IRRECOVERABLE_ERROR;
                 }
-                responseBody = post.getResponseBodyAsString().trim();
-                CommonLogger.activity.info(getName() + ": Received response: " + (responseBody.length() == 0? "[empty]" : responseBody));
-                if (responseBody.trim().length() == 0) return PostBackStatus.SUCCESS;
-            }
-            catch (ConnectTimeoutException e)
-            {
-                CommonLogger.alarm.warn(getName() + ": IO problem while posting to \"" + postBackURL + "\": " + xml + " -- " + e.getMessage());
-                return PostBackStatus.SERVER_IO_ERROR;                
-            }
-            catch (IOException e)
-            {
-                CommonLogger.alarm.warn(getName() + ": IO problem while posting to \"" + postBackURL + "\": " + xml + " -- " + e.getMessage());
-                return PostBackStatus.SERVER_IO_ERROR;
             }
-            catch (IllegalArgumentException e)
+            if (responseBody == null)
             {
-                CommonLogger.alarm.warn(getName() + ": When posting to \"" + postBackURL + "\": " + e.getMessage());
+                CommonLogger.alarm.warn(getName() + ": When posting to \"" + url + "\": " + " Exhausted allowable redirects");
                 return PostBackStatus.IRRECOVERABLE_ERROR;
             }
-                
             // parse into xml doc
             Document xmlDoc = null;
             try