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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>CachingExec (Apache HttpComponents Client 4.5.14 API)</title>
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<li>Summary:&nbsp;</li>
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<div class="subTitle">org.apache.http.impl.client.cache</div>
<h2 title="Class CachingExec" class="title">Class CachingExec</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li>org.apache.http.impl.client.cache.CachingExec</li>
</ul>
</li>
</ul>
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a></dd>
</dl>
<hr>
<br>
<pre>@Contract(threading=SAFE_CONDITIONAL)
public class <span class="strong">CachingExec</span>
extends <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a></pre>
<div class="block"><p>
Request executor in the request execution chain that is responsible for
transparent client-side caching.
</p>
<p>
The current implementation is conditionally
compliant with HTTP/1.1 (meaning all the MUST and MUST NOTs are obeyed),
although quite a lot, though not all, of the SHOULDs and SHOULD NOTs
are obeyed too.
</p>
<p>
Folks that would like to experiment with alternative storage backends
should look at the <a href="../../../../../../org/apache/http/client/cache/HttpCacheStorage.html" title="interface in org.apache.http.client.cache"><code>HttpCacheStorage</code></a> interface and the related
package documentation there. You may also be interested in the provided
<a href="../../../../../../org/apache/http/impl/client/cache/ehcache/EhcacheHttpCacheStorage.html" title="class in org.apache.http.impl.client.cache.ehcache"><code>EhCache</code></a> and <a href="../../../../../../org/apache/http/impl/client/cache/memcached/MemcachedHttpCacheStorage.html" title="class in org.apache.http.impl.client.cache.memcached"><code>memcached</code></a> storage backends.
</p>
<p>
Further responsibilities such as communication with the opposite
endpoint is delegated to the next executor in the request execution
chain.
</p></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>4.3</dd></dl>
</li>
</ul>
</div>
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<h3>Constructor Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#CachingExec(org.apache.http.impl.execchain.ClientExecChain)">CachingExec</a></strong>(<a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a>&nbsp;backend)</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#CachingExec(org.apache.http.impl.execchain.ClientExecChain,%20org.apache.http.impl.client.cache.HttpCache,%20org.apache.http.impl.client.cache.CacheConfig)">CachingExec</a></strong>(<a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a>&nbsp;backend,
org.apache.http.impl.client.cache.HttpCache&nbsp;cache,
<a href="../../../../../../org/apache/http/impl/client/cache/CacheConfig.html" title="class in org.apache.http.impl.client.cache">CacheConfig</a>&nbsp;config)</code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#CachingExec(org.apache.http.impl.execchain.ClientExecChain,%20org.apache.http.impl.client.cache.HttpCache,%20org.apache.http.impl.client.cache.CacheConfig,%20org.apache.http.impl.client.cache.AsynchronousValidator)">CachingExec</a></strong>(<a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a>&nbsp;backend,
org.apache.http.impl.client.cache.HttpCache&nbsp;cache,
<a href="../../../../../../org/apache/http/impl/client/cache/CacheConfig.html" title="class in org.apache.http.impl.client.cache">CacheConfig</a>&nbsp;config,
org.apache.http.impl.client.cache.AsynchronousValidator&nbsp;asynchRevalidator)</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#CachingExec(org.apache.http.impl.execchain.ClientExecChain,%20org.apache.http.client.cache.ResourceFactory,%20org.apache.http.client.cache.HttpCacheStorage,%20org.apache.http.impl.client.cache.CacheConfig)">CachingExec</a></strong>(<a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a>&nbsp;backend,
<a href="../../../../../../org/apache/http/client/cache/ResourceFactory.html" title="interface in org.apache.http.client.cache">ResourceFactory</a>&nbsp;resourceFactory,
<a href="../../../../../../org/apache/http/client/cache/HttpCacheStorage.html" title="interface in org.apache.http.client.cache">HttpCacheStorage</a>&nbsp;storage,
<a href="../../../../../../org/apache/http/impl/client/cache/CacheConfig.html" title="class in org.apache.http.impl.client.cache">CacheConfig</a>&nbsp;config)</code>&nbsp;</td>
</tr>
</table>
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<h3>Method Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/http/client/methods/CloseableHttpResponse.html" title="interface in org.apache.http.client.methods">CloseableHttpResponse</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#execute(org.apache.http.conn.routing.HttpRoute,%20org.apache.http.client.methods.HttpRequestWrapper)">execute</a></strong>(<a href="../../../../../../org/apache/http/conn/routing/HttpRoute.html" title="class in org.apache.http.conn.routing">HttpRoute</a>&nbsp;route,
<a href="../../../../../../org/apache/http/client/methods/HttpRequestWrapper.html" title="class in org.apache.http.client.methods">HttpRequestWrapper</a>&nbsp;request)</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/http/client/methods/CloseableHttpResponse.html" title="interface in org.apache.http.client.methods">CloseableHttpResponse</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#execute(org.apache.http.conn.routing.HttpRoute,%20org.apache.http.client.methods.HttpRequestWrapper,%20org.apache.http.client.protocol.HttpClientContext)">execute</a></strong>(<a href="../../../../../../org/apache/http/conn/routing/HttpRoute.html" title="class in org.apache.http.conn.routing">HttpRoute</a>&nbsp;route,
<a href="../../../../../../org/apache/http/client/methods/HttpRequestWrapper.html" title="class in org.apache.http.client.methods">HttpRequestWrapper</a>&nbsp;request,
<a href="../../../../../../org/apache/http/client/protocol/HttpClientContext.html" title="class in org.apache.http.client.protocol">HttpClientContext</a>&nbsp;context)</code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/http/client/methods/CloseableHttpResponse.html" title="interface in org.apache.http.client.methods">CloseableHttpResponse</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#execute(org.apache.http.conn.routing.HttpRoute,%20org.apache.http.client.methods.HttpRequestWrapper,%20org.apache.http.client.protocol.HttpClientContext,%20org.apache.http.client.methods.HttpExecutionAware)">execute</a></strong>(<a href="../../../../../../org/apache/http/conn/routing/HttpRoute.html" title="class in org.apache.http.conn.routing">HttpRoute</a>&nbsp;route,
<a href="../../../../../../org/apache/http/client/methods/HttpRequestWrapper.html" title="class in org.apache.http.client.methods">HttpRequestWrapper</a>&nbsp;request,
<a href="../../../../../../org/apache/http/client/protocol/HttpClientContext.html" title="class in org.apache.http.client.protocol">HttpClientContext</a>&nbsp;context,
<a href="../../../../../../org/apache/http/client/methods/HttpExecutionAware.html" title="interface in org.apache.http.client.methods">HttpExecutionAware</a>&nbsp;execAware)</code>
<div class="block">Executes th request either by transmitting it to the target server or
by passing it onto the next executor in the request execution chain.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#getCacheHits()">getCacheHits</a></strong>()</code>
<div class="block">Reports the number of times that the cache successfully responded
to an <code>HttpRequest</code> without contacting the origin server.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#getCacheMisses()">getCacheMisses</a></strong>()</code>
<div class="block">Reports the number of times that the cache contacted the origin
server because it had no appropriate response cached.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#getCacheUpdates()">getCacheUpdates</a></strong>()</code>
<div class="block">Reports the number of times that the cache was able to satisfy
a response by revalidating an existing but stale cache entry.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../../org/apache/http/impl/client/cache/CachingExec.html#supportsRangeAndContentRangeHeaders()">supportsRangeAndContentRangeHeaders</a></strong>()</code>
<div class="block">Reports whether this <code>CachingHttpClient</code> implementation
supports byte-range requests as specified by the <code>Range</code>
and <code>Content-Range</code> headers.</div>
</td>
</tr>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
</ul>
</li>
</ul>
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</ul>
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<h3>Constructor Detail</h3>
<a name="CachingExec(org.apache.http.impl.execchain.ClientExecChain, org.apache.http.impl.client.cache.HttpCache, org.apache.http.impl.client.cache.CacheConfig)">
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<h4>CachingExec</h4>
<pre>public&nbsp;CachingExec(<a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a>&nbsp;backend,
org.apache.http.impl.client.cache.HttpCache&nbsp;cache,
<a href="../../../../../../org/apache/http/impl/client/cache/CacheConfig.html" title="class in org.apache.http.impl.client.cache">CacheConfig</a>&nbsp;config)</pre>
</li>
</ul>
<a name="CachingExec(org.apache.http.impl.execchain.ClientExecChain, org.apache.http.impl.client.cache.HttpCache, org.apache.http.impl.client.cache.CacheConfig, org.apache.http.impl.client.cache.AsynchronousValidator)">
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<h4>CachingExec</h4>
<pre>public&nbsp;CachingExec(<a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a>&nbsp;backend,
org.apache.http.impl.client.cache.HttpCache&nbsp;cache,
<a href="../../../../../../org/apache/http/impl/client/cache/CacheConfig.html" title="class in org.apache.http.impl.client.cache">CacheConfig</a>&nbsp;config,
org.apache.http.impl.client.cache.AsynchronousValidator&nbsp;asynchRevalidator)</pre>
</li>
</ul>
<a name="CachingExec(org.apache.http.impl.execchain.ClientExecChain, org.apache.http.client.cache.ResourceFactory, org.apache.http.client.cache.HttpCacheStorage, org.apache.http.impl.client.cache.CacheConfig)">
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<h4>CachingExec</h4>
<pre>public&nbsp;CachingExec(<a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a>&nbsp;backend,
<a href="../../../../../../org/apache/http/client/cache/ResourceFactory.html" title="interface in org.apache.http.client.cache">ResourceFactory</a>&nbsp;resourceFactory,
<a href="../../../../../../org/apache/http/client/cache/HttpCacheStorage.html" title="interface in org.apache.http.client.cache">HttpCacheStorage</a>&nbsp;storage,
<a href="../../../../../../org/apache/http/impl/client/cache/CacheConfig.html" title="class in org.apache.http.impl.client.cache">CacheConfig</a>&nbsp;config)</pre>
</li>
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<a name="CachingExec(org.apache.http.impl.execchain.ClientExecChain)">
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<h4>CachingExec</h4>
<pre>public&nbsp;CachingExec(<a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a>&nbsp;backend)</pre>
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<h3>Method Detail</h3>
<a name="getCacheHits()">
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<h4>getCacheHits</h4>
<pre>public&nbsp;long&nbsp;getCacheHits()</pre>
<div class="block">Reports the number of times that the cache successfully responded
to an <code>HttpRequest</code> without contacting the origin server.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the number of cache hits</dd></dl>
</li>
</ul>
<a name="getCacheMisses()">
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</a>
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<h4>getCacheMisses</h4>
<pre>public&nbsp;long&nbsp;getCacheMisses()</pre>
<div class="block">Reports the number of times that the cache contacted the origin
server because it had no appropriate response cached.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the number of cache misses</dd></dl>
</li>
</ul>
<a name="getCacheUpdates()">
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<h4>getCacheUpdates</h4>
<pre>public&nbsp;long&nbsp;getCacheUpdates()</pre>
<div class="block">Reports the number of times that the cache was able to satisfy
a response by revalidating an existing but stale cache entry.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the number of cache revalidations</dd></dl>
</li>
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<a name="execute(org.apache.http.conn.routing.HttpRoute, org.apache.http.client.methods.HttpRequestWrapper)">
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<h4>execute</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/http/client/methods/CloseableHttpResponse.html" title="interface in org.apache.http.client.methods">CloseableHttpResponse</a>&nbsp;execute(<a href="../../../../../../org/apache/http/conn/routing/HttpRoute.html" title="class in org.apache.http.conn.routing">HttpRoute</a>&nbsp;route,
<a href="../../../../../../org/apache/http/client/methods/HttpRequestWrapper.html" title="class in org.apache.http.client.methods">HttpRequestWrapper</a>&nbsp;request)
throws <a href="https://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
org.apache.http.HttpException</pre>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dd><code>org.apache.http.HttpException</code></dd></dl>
</li>
</ul>
<a name="execute(org.apache.http.conn.routing.HttpRoute, org.apache.http.client.methods.HttpRequestWrapper, org.apache.http.client.protocol.HttpClientContext)">
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<h4>execute</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/http/client/methods/CloseableHttpResponse.html" title="interface in org.apache.http.client.methods">CloseableHttpResponse</a>&nbsp;execute(<a href="../../../../../../org/apache/http/conn/routing/HttpRoute.html" title="class in org.apache.http.conn.routing">HttpRoute</a>&nbsp;route,
<a href="../../../../../../org/apache/http/client/methods/HttpRequestWrapper.html" title="class in org.apache.http.client.methods">HttpRequestWrapper</a>&nbsp;request,
<a href="../../../../../../org/apache/http/client/protocol/HttpClientContext.html" title="class in org.apache.http.client.protocol">HttpClientContext</a>&nbsp;context)
throws <a href="https://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
org.apache.http.HttpException</pre>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dd><code>org.apache.http.HttpException</code></dd></dl>
</li>
</ul>
<a name="execute(org.apache.http.conn.routing.HttpRoute, org.apache.http.client.methods.HttpRequestWrapper, org.apache.http.client.protocol.HttpClientContext, org.apache.http.client.methods.HttpExecutionAware)">
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<h4>execute</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/http/client/methods/CloseableHttpResponse.html" title="interface in org.apache.http.client.methods">CloseableHttpResponse</a>&nbsp;execute(<a href="../../../../../../org/apache/http/conn/routing/HttpRoute.html" title="class in org.apache.http.conn.routing">HttpRoute</a>&nbsp;route,
<a href="../../../../../../org/apache/http/client/methods/HttpRequestWrapper.html" title="class in org.apache.http.client.methods">HttpRequestWrapper</a>&nbsp;request,
<a href="../../../../../../org/apache/http/client/protocol/HttpClientContext.html" title="class in org.apache.http.client.protocol">HttpClientContext</a>&nbsp;context,
<a href="../../../../../../org/apache/http/client/methods/HttpExecutionAware.html" title="interface in org.apache.http.client.methods">HttpExecutionAware</a>&nbsp;execAware)
throws <a href="https://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
org.apache.http.HttpException</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html#execute(org.apache.http.conn.routing.HttpRoute,%20org.apache.http.client.methods.HttpRequestWrapper,%20org.apache.http.client.protocol.HttpClientContext,%20org.apache.http.client.methods.HttpExecutionAware)">ClientExecChain</a></code></strong></div>
<div class="block">Executes th request either by transmitting it to the target server or
by passing it onto the next executor in the request execution chain.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html#execute(org.apache.http.conn.routing.HttpRoute,%20org.apache.http.client.methods.HttpRequestWrapper,%20org.apache.http.client.protocol.HttpClientContext,%20org.apache.http.client.methods.HttpExecutionAware)">execute</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/http/impl/execchain/ClientExecChain.html" title="interface in org.apache.http.impl.execchain">ClientExecChain</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>route</code> - connection route.</dd><dd><code>request</code> - current request.</dd><dd><code>context</code> - current HTTP context.</dd><dd><code>execAware</code> - receiver of notifications of blocking I/O operations.</dd>
<dt><span class="strong">Returns:</span></dt><dd>HTTP response either received from the opposite endpoint
or generated locally.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - in case of a I/O error.
(this type of exceptions are potentially recoverable).</dd>
<dd><code>org.apache.http.HttpException</code> - in case of an HTTP protocol error
(usually this type of exceptions are non-recoverable).</dd></dl>
</li>
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<a name="supportsRangeAndContentRangeHeaders()">
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<h4>supportsRangeAndContentRangeHeaders</h4>
<pre>public&nbsp;boolean&nbsp;supportsRangeAndContentRangeHeaders()</pre>
<div class="block">Reports whether this <code>CachingHttpClient</code> implementation
supports byte-range requests as specified by the <code>Range</code>
and <code>Content-Range</code> headers.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if byte-range requests are supported</dd></dl>
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