[1.8.x] + fix issue AsyncHttpClient#1691

https://java.net/jira/browse/GRIZZLY-1691
"Support RFC 7238, HTTP Status Code "308 Permanent Redirect""

Author: oleksiys

pom.xml

@@ -591,7 +591,7 @@
         <compiler.exclude>com/ning/http/client/providers/grizzly/*.java</compiler.exclude>
         <test.compiler.exclude>com/ning/http/client/async/grizzly/*.java</test.compiler.exclude>
         <javadoc.package.exclude>com.ning.http.client.providers.grizzly</javadoc.package.exclude>
-        <grizzly.version>2.3.13</grizzly.version>
+        <grizzly.version>2.3.14</grizzly.version>
         <source.property>1.5</source.property>
         <target.property>1.5</target.property>
         <surefire.version>2.12</surefire.version>

src/main/java/com/ning/http/client/providers/grizzly/GrizzlyAsyncHttpProvider.java

@@ -1127,7 +1127,8 @@ private void addQueryString(final Request request,
 
     private static final class AsyncHttpClientEventFilter extends HttpClientFilter {
 
-        private final Map<Integer,StatusHandler> HANDLER_MAP = new HashMap<Integer,StatusHandler>();
+        private final Map<Integer, StatusHandler> HANDLER_MAP =
+                new HashMap<Integer, StatusHandler>();
 
 
         private final GrizzlyAsyncHttpProvider provider;
@@ -1145,8 +1146,12 @@ private static final class AsyncHttpClientEventFilter extends HttpClientFilter {
                     RedirectHandler.INSTANCE);
             HANDLER_MAP.put(HttpStatus.FOUND_302.getStatusCode(),
                     RedirectHandler.INSTANCE);
+            HANDLER_MAP.put(HttpStatus.SEE_OTHER_303.getStatusCode(),
+                    RedirectHandler.INSTANCE);
             HANDLER_MAP.put(HttpStatus.TEMPORARY_REDIRECT_307.getStatusCode(),
                     RedirectHandler.INSTANCE);
+            HANDLER_MAP.put(HttpStatus.PERMANENT_REDIRECT_308.getStatusCode(),
+                    RedirectHandler.INSTANCE);
 
         }
 
@@ -1557,7 +1562,8 @@ private static boolean isRedirect(final int status) {
             return HttpStatus.MOVED_PERMANENTLY_301.statusMatches(status)
                     || HttpStatus.FOUND_302.statusMatches(status)
                     || HttpStatus.SEE_OTHER_303.statusMatches(status)
-                    || HttpStatus.TEMPORARY_REDIRECT_307.statusMatches(status);
+                    || HttpStatus.TEMPORARY_REDIRECT_307.statusMatches(status)
+                    || HttpStatus.PERMANENT_REDIRECT_308.statusMatches(status);
 
         }