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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.extend;

/**
 * An interface to resolve the fact that many webservers treat blah/index.html
 * the same as blah/.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface PageNormalizer
{
    /**
     * Take an un-normalized URL and turn it into the canonical form for that
     * URL. In general this will work by stripping off extra components like
     * index.html rather than adding them in.
     * @param unnormalized The raw string from the browser
     * @return A canonical form that DWR uses to compare pages for equivalence.
     */
    public String normalizePage(String unnormalized);
}