testing work

spring-security-rest-custom/pom.xml

@@ -134,6 +134,11 @@
             <artifactId>guava</artifactId>
             <version>${guava.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
 
         <!-- test scoped -->
 

spring-security-rest-custom/src/test/java/org/baeldung/live/HttpLiveServiceTemp.java

@@ -5,7 +5,10 @@ import static org.junit.Assert.assertThat;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.List;
 
+import org.apache.commons.lang3.tuple.ImmutablePair;
+import org.apache.commons.lang3.tuple.Pair;
 import org.apache.http.Header;
 import org.apache.http.HttpEntity;
 import org.apache.http.HttpHeaders;
@@ -19,6 +22,7 @@ import org.junit.Before;
 import org.junit.Test;
 
 import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
 
 public class HttpLiveServiceTemp {
 
@@ -63,6 +67,60 @@ public class HttpLiveServiceTemp {
         return newUrl;
     }
 
+    final String expandSafe(final String urlArg) throws IOException {
+        String originalUrl = urlArg;
+        String newUrl = expandSingleLevelSafe(originalUrl).getRight();
+        final List<String> alreadyVisited = Lists.newArrayList(originalUrl, newUrl);
+        while (!originalUrl.equals(newUrl)) {
+            originalUrl = newUrl;
+            final Pair<Integer, String> statusAndUrl = expandSingleLevelSafe(originalUrl);
+            newUrl = statusAndUrl.getRight();
+            final boolean isRedirect = statusAndUrl.getLeft() == 301 || statusAndUrl.getLeft() == 302;
+            if (isRedirect && alreadyVisited.contains(newUrl)) {
+                throw new IllegalStateException("Likely a redirect loop");
+            }
+            alreadyVisited.add(newUrl);
+        }
+
+        return newUrl;
+    }
+
+    final Pair<Integer, String> expandSingleLevelSafe(final String url) throws IOException {
+        HttpGet request = null;
+        HttpEntity httpEntity = null;
+        InputStream entityContentStream = null;
+
+        try {
+            request = new HttpGet(url);
+            final HttpResponse httpResponse = client.execute(request);
+
+            httpEntity = httpResponse.getEntity();
+            entityContentStream = httpEntity.getContent();
+
+            final int statusCode = httpResponse.getStatusLine().getStatusCode();
+            if (statusCode != 301 && statusCode != 302) {
+                return new ImmutablePair<Integer, String>(statusCode, url);
+            }
+            final Header[] headers = httpResponse.getHeaders(HttpHeaders.LOCATION);
+            Preconditions.checkState(headers.length == 1);
+            final String newUrl = headers[0].getValue();
+
+            return new ImmutablePair<Integer, String>(statusCode, newUrl);
+        } catch (final IllegalArgumentException uriEx) {
+            return new ImmutablePair<Integer, String>(500, url);
+        } finally {
+            if (request != null) {
+                request.releaseConnection();
+            }
+            if (entityContentStream != null) {
+                entityContentStream.close();
+            }
+            if (httpEntity != null) {
+                EntityUtils.consume(httpEntity);
+            }
+        }
+    }
+
     final String expandSingleLevel(final String url) throws IOException {
         HttpGet request = null;
         HttpEntity httpEntity = null;