jakartaee-9.0/javadoc/jakarta/ws/rs/core/HttpHeaders.html - tomee-site-pub - Git at Google

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 <div class="subTitle">jakarta.ws.rs.core</div>
 <h2 title="Interface HttpHeaders" class="title">Interface HttpHeaders</h2>
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 <pre>public interface <span class="typeNameLabel">HttpHeaders</span></pre>
 <div class="block">An injectable interface that provides access to HTTP header information. All methods throw
  <code>IllegalStateException</code> if called outside the scope of a request (e.g. from a provider constructor).</div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>1.0</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../../jakarta/ws/rs/core/Context.html" title="annotation in jakarta.ws.rs.core"><code>Context</code></a></dd>
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 <h3>Field Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
 <caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Field and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#ACCEPT">ACCEPT</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#ACCEPT_CHARSET">ACCEPT_CHARSET</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.2">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#ACCEPT_ENCODING">ACCEPT_ENCODING</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#ACCEPT_LANGUAGE">ACCEPT_LANGUAGE</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#ALLOW">ALLOW</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.7">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#AUTHORIZATION">AUTHORIZATION</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.8">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#CACHE_CONTROL">CACHE_CONTROL</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#CONTENT_DISPOSITION">CONTENT_DISPOSITION</a></span></code>
 <div class="block">See <a href="http://tools.ietf.org/html/rfc2183">IETF RFC-2183</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#CONTENT_ENCODING">CONTENT_ENCODING</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.11">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#CONTENT_ID">CONTENT_ID</a></span></code>
 <div class="block">See <a href="http://tools.ietf.org/html/rfc2392">IETF RFC-2392</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#CONTENT_LANGUAGE">CONTENT_LANGUAGE</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.12">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#CONTENT_LENGTH">CONTENT_LENGTH</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.13">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#CONTENT_LOCATION">CONTENT_LOCATION</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.14">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#CONTENT_TYPE">CONTENT_TYPE</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#COOKIE">COOKIE</a></span></code>
 <div class="block">See <a href="http://www.ietf.org/rfc/rfc2109.txt">IETF RFC 2109</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#DATE">DATE</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.18">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#ETAG">ETAG</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#EXPIRES">EXPIRES</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.21">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#HOST">HOST</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.23">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#IF_MATCH">IF_MATCH</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.24">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#IF_MODIFIED_SINCE">IF_MODIFIED_SINCE</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#IF_NONE_MATCH">IF_NONE_MATCH</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#IF_UNMODIFIED_SINCE">IF_UNMODIFIED_SINCE</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.28">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#LAST_EVENT_ID_HEADER">LAST_EVENT_ID_HEADER</a></span></code>
 <div class="block"><code>"Last-Event-ID"</code> HTTP request header name as defined by
  <a href="http://www.w3.org/TR/eventsource/#last-event-id">SSE specification</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#LAST_MODIFIED">LAST_MODIFIED</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.29">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#LINK">LINK</a></span></code>
 <div class="block">See <a href="http://tools.ietf.org/html/rfc5988#page-6">Web Linking (IETF RFC-5988) documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#LOCATION">LOCATION</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.30">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#RETRY_AFTER">RETRY_AFTER</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.37">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#SET_COOKIE">SET_COOKIE</a></span></code>
 <div class="block">See <a href="http://www.ietf.org/rfc/rfc2109.txt">IETF RFC 2109</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#USER_AGENT">USER_AGENT</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.43">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#VARY">VARY</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.44">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#WWW_AUTHENTICATE">WWW_AUTHENTICATE</a></span></code>
 <div class="block">See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.47">HTTP/1.1 documentation</a>.</div>
 </td>
 </tr>
 </table>
 </li>
 </ul>
 <!-- ========== METHOD SUMMARY =========== -->
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 <!--   -->
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 <h3>Method Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code>java.util.List&lt;java.util.Locale&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getAcceptableLanguages--">getAcceptableLanguages</a></span>()</code>
 <div class="block">
  Get a list of languages that are acceptable for the response.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>java.util.List&lt;<a href="../../../../jakarta/ws/rs/core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getAcceptableMediaTypes--">getAcceptableMediaTypes</a></span>()</code>
 <div class="block">
  Get a list of media types that are acceptable for the response.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>java.util.Map&lt;java.lang.String,<a href="../../../../jakarta/ws/rs/core/Cookie.html" title="class in jakarta.ws.rs.core">Cookie</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getCookies--">getCookies</a></span>()</code>
 <div class="block">Get any cookies that accompanied the request.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>java.util.Date</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getDate--">getDate</a></span>()</code>
 <div class="block">Get message date.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>java.lang.String</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getHeaderString-java.lang.String-">getHeaderString</a></span>(java.lang.String&nbsp;name)</code>
 <div class="block">
  Get a HTTP header as a single string value.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>java.util.Locale</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getLanguage--">getLanguage</a></span>()</code>
 <div class="block">Get the language of the request entity.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getLength--">getLength</a></span>()</code>
 <div class="block">Get Content-Length value.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code><a href="../../../../jakarta/ws/rs/core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getMediaType--">getMediaType</a></span>()</code>
 <div class="block">Get the media type of the request entity.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>java.util.List&lt;java.lang.String&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getRequestHeader-java.lang.String-">getRequestHeader</a></span>(java.lang.String&nbsp;name)</code>
 <div class="block">Get the values of a HTTP request header.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code><a href="../../../../jakarta/ws/rs/core/MultivaluedMap.html" title="interface in jakarta.ws.rs.core">MultivaluedMap</a>&lt;java.lang.String,java.lang.String&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../jakarta/ws/rs/core/HttpHeaders.html#getRequestHeaders--">getRequestHeaders</a></span>()</code>
 <div class="block">Get the values of HTTP request headers.</div>
 </td>
 </tr>
 </table>
 </li>
 </ul>
 </li>
 </ul>
 </div>
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  first.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.IllegalStateException</code> - if called outside the scope of a request.</dd>
 </dl>
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 <pre>java.util.List&lt;java.util.Locale&gt;&nbsp;getAcceptableLanguages()</pre>
 <div class="block"><p>
  Get a list of languages that are acceptable for the response.
  </p>
  If no acceptable languages are specified, a read-only list containing a single wildcard <code>Locale</code>
  instance (with language field set to "<code>*</code>") is returned.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>a read-only list of acceptable languages sorted according to their q-value, with highest preference first.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.IllegalStateException</code> - if called outside the scope of a request.</dd>
 </dl>
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 <pre><a href="../../../../jakarta/ws/rs/core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a>&nbsp;getMediaType()</pre>
 <div class="block">Get the media type of the request entity.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the media type or <code>null</code> if there is no request entity.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.IllegalStateException</code> - if called outside the scope of a request.</dd>
 </dl>
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 <h4>getLanguage</h4>
 <pre>java.util.Locale&nbsp;getLanguage()</pre>
 <div class="block">Get the language of the request entity.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the language of the entity or <code>null</code> if not specified.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.IllegalStateException</code> - if called outside the scope of a request.</dd>
 </dl>
 </li>
 </ul>
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 <pre>java.util.Map&lt;java.lang.String,<a href="../../../../jakarta/ws/rs/core/Cookie.html" title="class in jakarta.ws.rs.core">Cookie</a>&gt;&nbsp;getCookies()</pre>
 <div class="block">Get any cookies that accompanied the request.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>a read-only map of cookie name (String) to Cookie.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.IllegalStateException</code> - if called outside the scope of a request</dd>
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 <pre>java.util.Date&nbsp;getDate()</pre>
 <div class="block">Get message date.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the message date, otherwise <code>null</code> if not present.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.0</dd>
 </dl>
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 <pre>int&nbsp;getLength()</pre>
 <div class="block">Get Content-Length value.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Content-Length as integer if present and valid number. In other cases returns -1.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.0</dd>
 </dl>
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