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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
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 * 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
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 *   http://www.apache.org/licenses/LICENSE-2.0
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 * This software consists of voluntary contributions made by many
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package org.apache.http.protocol;

/**
 * HttpContext represents execution state of an HTTP process. It is a structure
 * that can be used to map an attribute name to an attribute value.
 * 

* The primary purpose of the HTTP context is to facilitate information sharing * among various logically related components. HTTP context can be used * to store a processing state for one message or several consecutive messages. * Multiple logically related messages can participate in a logical session * if the same context is reused between consecutive messages. *

*

* IMPORTANT: Please note HTTP context implementation, even when thread safe, * may not be used concurrently by multiple threads, as the context may contain * thread unsafe attributes. *

* * @since 4.0 */ public interface HttpContext { /** The prefix reserved for use by HTTP components. "http." */ public static final String RESERVED_PREFIX = "http."; /** * Obtains attribute with the given name. * * @param id the attribute name. * @return attribute value, or {@code null} if not set. */ Object getAttribute(String id); /** * Sets value of the attribute with the given name. * * @param id the attribute name. * @param obj the attribute value. */ void setAttribute(String id, Object obj); /** * Removes attribute with the given name from the context. * * @param id the attribute name. * @return attribute value, or {@code null} if not set. */ Object removeAttribute(String id); }




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