GUACAMOLE-504: Add method for WebSocket status, and reconfigure REST API to use new HTTP method.

guacamole-common/src/main/java/org/apache/guacamole/GuacamoleException.java

@@ -81,4 +81,16 @@ public class GuacamoleException extends Exception {
         return getStatus().getHttpStatusCode();
     }
 
+    /**
+     * Returns the most applicable WebSocket status code that can be
+     * associated with this exception.
+     *
+     * @return
+     *     An integer representing the most applicable WebSocket status
+     *     code associated with this exception.
+     */
+    public int getWebSocketCode() {
+        return getStatus().getWebSocketCode();
+    }
+    
 }

guacamole/src/main/java/org/apache/guacamole/rest/RESTExceptionWrapper.java

@@ -173,7 +173,7 @@ public class RESTExceptionWrapper implements MethodInterceptor {
         // Translate GuacamoleException subclasses to HTTP error codes
         catch (GuacamoleException e) {
             throw new APIException(
-                Response.Status.fromStatusCode(e.getStatus().getHttpStatusCode()),
+                Response.Status.fromStatusCode(e.getHttpStatusCode()),
                 e
             );
         }