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The Apache Sling API defines an extension to the Servlet API 2.4 to provide access to content and unified access to request parameters hiding the differences between the different methods of transferring parameters from client to server. Note that the Apache Sling API bundle does not include the Servlet API but instead requires the API to be provided by the Servlet container in which the Apache Sling framework is running or by another bundle.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.sling.api.servlets;

/**
 * HTTP-related constants
 * 
 * This class is not intended to be extended or instantiated because it just
 * provides constants not intended to be overwritten.
 */
public class HttpConstants {

    public static final String METHOD_OPTIONS = "OPTIONS";
    public static final String METHOD_GET = "GET";
    public static final String METHOD_HEAD = "HEAD";
    public static final String METHOD_POST = "POST";
    public static final String METHOD_PUT = "PUT";
    public static final String METHOD_DELETE = "DELETE";
    public static final String METHOD_TRACE = "TRACE";
    public static final String METHOD_CONNECT = "CONNECT";

    public static final String HEADER_ACCEPT = "Accept";
    public static final String HEADER_ETAG = "ETag";
    public static final String HEADER_IF_MATCH = "If-Match";
    public static final String HEADER_IF_MODIFIED_SINCE = "If-Modified-Since";
    public static final String HEADER_LAST_MODIFIED = "Last-Modified";

}